19 



Fam. 3. Cerviniidae. 



Characters. Body more or less slender, with the anterior and posterior 

 divisions generally well marked off from each other. Cephalosome in some cases 

 distinctly defined from the 1st segment of the metasome, rostral plate quite im- 

 mobile, forming the immediate continuation of the cephalic shield. Caudal rami, 

 as a rule, much elongated, though scarcely divergent. Eye wholly absent. An- 

 terior antennae comparatively short and robust, 6 7-articulate, and more or less 

 densely clothed with partly ciliated setae. Posterior antennse with the outer 2 

 joints of the inner ramus confluent, outer ramus less fully developed than in the 

 Longipediidce. Mandibles very strong, with the palp generally large, biramous. 

 Maxillse with the outer appendages (exopodite and vibratory plate) more or less 

 rudimentary. Anterior maxillipeds short and compact; posterior ones of less deli- 

 cate structure than in the Longipediidce, and scarcely at all lamellar. Natatory 

 legs of somewhat varying structure in the different genera. Last pair of legs 

 small, biarticulate. Ovisac simple. 



Remarks. The type of this family is the remarkable genus Cervinia of 

 Norman, the systematic position of which has been much disputed by carcinologists. 

 Closely allied to it is a new genus, Cerviniopsis, to be treated of below, as also 

 the genus Eucanuella of Scott. Finally, I am of opinion that the genus Zosime 

 of Boeck, though in some points differing conspicuously from the 3 above-men- 

 tioned genera, ought more properly to be included in the present family. All 

 the species belonging to this family, are true deep-water forms; and in accordance 

 therewith are quite devoid of visual organs. They moreover differ materially from 

 those of the Longipediidce in the fact that the rostral plate is quite immobile 

 and continuous with the cephalic shield, as also in the very different structure of 

 the posterior maxillipeds. 



Gen. 5. CerVima, Norman, 1878. 



Generic Characters. Body slender, attenuated, with very thin and flex- 

 ible integuments. Cephalosome distinctly defined from the 1st segment of meta- 

 some, lateral parts but slightly expanded, wholly exposing the oral appendages. 

 Epimeral plates of the pedigerous segments small, rounded; last segment rather 

 narrow. Urosome comparatively large, genital segment in female without any 



