79_ 



sandy bottom. Subsequently I have met with this form not [infrequently in 2 

 places on the Finmark coast, viz., Hasvig and Vads0 in about the same depth. 

 Distribution. Spitsbergen (Norw. North Atl. Expedition), Fran/. Joseph 

 Land (T. Scott), Heligoland (Ehrenbaum). 



Fam. 7. Nannastacidae. 



Syn: Cumettidfe, G. O. Sars. 



Characters. Body, as a rule, not very slender, sometimes even unusually 

 short and compact, with the anterior division well defined from the posterior. 

 Carapace large, with the pseudorostral projection more or less produced, subrostral 

 corners well defined and sometimes very prominent, lower edges generally serrate 

 in their anterior part. Five pedigerous segments freely exposed behind the cara- 

 pace, the first very narrow, band-like. Tail slender and narrow. Eyes two in 

 number, separated by a distinct interspace, or confluent to a single median organ, 

 as in most other Cumacea. Superior antenna? of exactly the same appearance 

 in the two sexes, inner flagellum rudimentary. Inferior antennee in female very 

 small and indistinctly articulated, in male well developed, though as a rule shorter 

 than the body. Oral parts on the whole normal. The 2 anterior pairs of legs 

 in female with well developed exopodites, the 3 posterior pairs simple and very 

 narrow, terminating in a hooked claw. All legs in male, except the last pair, 

 with exopodites, and having the basal joint greatly dilated. Pleopoda absent. 

 Uropoda resembling in structure those in the Pseudocumidm. No telson. 



Remarks. The present family comprises as yet 2 very distinct genera, 

 viz., Nannastacus Sp. Bate and Cumdla G. 0. Sars. especially distinguished by 

 the very different structure of the visual organ, the species of the first-named 

 genus having 2 well-defined eyes, whereas those of the 2nd have but a single 

 median eye, as in most other Cumacea. The genus Nannastacus being the first to be 

 established, the family, according to the rule in Zoology, ought to be named from 

 it. and not from the genus Cumella, as previously done by the present author. 

 The family in some respects forms a transition to the last very anomalous family. 

 Campylaspidce, agreeing with it, among other things, in the total absence of a 

 telson and of pleopoda in the male. The structure of the oral parts, however, is 



