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Parameters of equations relating wet and dry body weight to length have been calculated for four species of caprellids from the Japan Sea (Possjet Bay), specifically Caprella cristibrachium, C. kroyeri, C. penantis, and C. bispinosa. A common equation was obtained for oxygen consumption rate in relation to body weight. It was shown that within the Order Amphipoda the metabolic rate of caprellids is 1.5 times lower than that of gammarids. The differences in the fecundity of gravid females of four species and females of one species in the spring and summer, respectively, are shown. At the same time the relationship between number of eggs per female and wet body weight of female is approximated by one equation. The equation obtained shows that caprellids represent an ecologically homogeneous group.

Relationships between number of eggs ( N g ) , brood weight ( arid body length (L) :mi n-cight, (MI) of females were studied for 16 orders and suborders of Crustacea. The study was based on the aathors' observations in the inland waters of the EinopeanUSSR, in the coastal regions of the farrnstern and northern seas nnd data from V. V. KUZNETSOV (preserved in archives). An cxtcnsirr literature wits also used. The equations describing the relationships (1Yg -f(L) and If$ = f ( TI-) arc calculated for some species and high taxons. On the average for the superclass (excluding the order Notostracn) the W,/W ratio appeared to bc 0.16. This ratio is markedly different for species of ?u'otost,rwa. It is supposed that t,liis difference is due to the high metabolic rate of Xot#ostraca.