79 
sandy bottom. Subsequently I have met with this form not unfrequently in 2 
places on the Finmark coast, viz., Hasvig and Yadso in about the same depth. 
Distribution. — Spitsbergen (Norw. North Atl. Expedition), Franz Joseph 
Land (T. Scott), Heligoland (Ehrenbaum). 
Fam. 7. Nannastacidae. 
Syn: Cumellidce, G. 0. 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 antennse of exactly the same appearance 
in the two sexes, inner flagellum rudimentary. Inferior antennse 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 Pseudocumidce. No telson. 
Remarks. —The present family comprises as yet 2 very distinct genera, 
viz., Nannastacus Sp. Bate and Cumella 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 hut 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 
