470 MR. G. S. BRADY'S MONOGRAPH OF 



upwards and 



backwards. Last pair of feet very small, obsoletely Particulate, termi- 

 uncqual seta?, one of which is very long, often exceeding the length of the 

 limb." Abdomen large and stout, in the adult female mostly filled with ova, behind 

 foiminff an obtuse process. Postabdominal laminae short and rounded, armed with 



and one longer annulated seta springing in front. Eyes wanting, but 

 the base of the upper antenna? are several lens-like bodies which seem to be imperfect 

 organs of vision, irregularly grouped, but always placed in a distinct nervous layer, and 

 without pigment. One male copulative organ, of simple structure, attached in front of 

 the postabdominal plates on the left side. Animal very agile, swimming very rapidly." 



CoNCiKECiA obtusata, G. 0. Sars. (Plate XLI. fig. 9.) 



Conchcecia obtusata, G. O. Sars, loc.cit. p. 118. 



Carapace, as seen from the side, sub quadrangular, height equal to more than half 



the length. Anterior margin produced into a sort of hood ; posterior obtusely truncate 

 its inferior angle broadly rounded and destitute of spines ; superior and inferior margins 

 nearly straight, parallel. Shell structureless, destitute of striae or reticulation. 

 Length 2 L o m - 



Hab. Shetland (Rev. A. M. Norman). 



The description here given does not accurately correspond with that of C. obtusata as 

 given by Sars, particularly as regards the structure of the shell, which that author states 



to be " striis concentricis subtiliter striata ; " but it is impossible to make a minute exami- 

 nation without the destruction of the single specimen preserved in Mr. Norman's col- 

 lection ; I therefore, for the present, refer it to C. obtusata, which it approaches, at all 

 events, more closely than any other species. 



Section III. CLADOCOPA. 



Earn. Polycopid^:. 



" Valves subequal, thin, not notched in front. Upper and lower antennae both natatory, 

 t erminated by long setae, basal portion of both large, stout, and muscular ; the upper 

 simple, not geniculate, the lower two-branched, both branches natatory. Mandibles 

 distinct, strongly toothed below ; palp short, neither pediform nor clawed. Two pairs 

 only of posterior limbs, scarcely pediform, the first natatory, the second branchial. Ab- 

 domen terminated by two short unguiferous laminae. Eyes wanting. No heart. Intes- 



forming a simpl 



Genus Polycope, G. 0. Sars. 



" Valves rounded, ventricose, thin, and fragile, corneo-calcareous. Eorehead having 

 no tentacle, but in its place two ciliated sette. Upper antennae three-jointed, last joint 

 hort, terminal setae long and slender ; terminal rami of the lower antennae unequal, one 

 many-jointed, of structure very similar to that of Ct/pridina, the other shorter and three- 

 jointed. Lower extremity of mandibles strongly inflexed, armed with a few small acute 



; 

 I 



