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Abstract

a language not their own are urgently requested ta have their manuscripts checked for linguistic correctness before submission. All papers should finish (in addition) with an English summary, giving a synopsis of the paper with sufficient detailed information concerning the methods used and the results obtained.3 Papers should be typed in double spacing, on one side of the paper, quarto size. leaving top and left hand margin at least 2.5 cm (one inch) wide.4 Papers should be headed by a title, the initials(s) and name(s) of author(s) and an exact description of the post held and business address of the author(s). Dates should be in the form "5 February 1959".Continuation see inside of back cover.Int. J. Speleol. 6 (1974), pp. 187-192. A (24.3.73). "These three localities are extremely similar. They are three beaches of the Caribbean See, located on the southern coast of the eastern extremity of the Island, at the foot of the Gran Piedra Mountain.The sand of these beaches is mainly of fluviatile origin but there are also many coral fragments in the sand. It is coarse, loose and clean (without much plant detritus). The samples were made by digging holes into the sand ("Karaman-Chappuis sondages") 1-3 m from the wave line and filtering through a net the water which more or less rapidly fills these holes. This water is strongly brackish, anyway less salt than the sea. The temperature of the water filling the holes was 280C (Siboney), 21 0 (Juragua) and nOc (Baconas). The three beaches have very rich and varied interstitial fauna." DESCRIPTIONThe collection consisted of about 25-30 very small animals** (trunk usually about 3 mm long), whitish in colour and semi-to almost completely transparent to transmited light. No eggs were found in the body cavity of any of the specimens so *) Department of Zoology, University of Adelaide, South Australia. **) Some other specimens were not sent to me but remained in the collections of the Institute of Speology, Bucharest. 188 S. J. EDMONDSthat it is difficult to say whether they were adults. The body wal1 was so thin and the specimens so smal1 that the animals were difficult to dissect. Fig. 1 was drawn from an undissected specimen.Trunk more or less cylindrical with smooth skin; length 1-5-4.2 mm and width 0.4-0.9 mm. Anal (anterior) and caudal (posterior) shields pale yel10w in colour and composed of smal1 polygonal plates. Shields without furrows. In about eight specimens the caudal shield is poorly developed and appears to be rudimentary or even absent.Introvert fine, in the ful1y extended condition up to 15 mm long and much longer than the trunk. It arises eccentrical1y from the trunk, ventral to the anal shield. Anteriorly it is armed with 20-24 rows of very small, clear, double-pointed hooks; at the base of each hook are a number of curved bars. Spines are absent though at least in four specimens a few, single pointed clear hooks, about the same size as the double pointed ones, were sparsely distributed posterior to the region which bears the rows of doubled pointed ho...