62 
legs exhibiting the usual transformation. Pleopoda of the structure characteristic 
of the genus. Uropoda very slender, with the inner ramus somewhat longer 
than the outer, and armed inside with about 20 ciliated spinules. Telson consi¬ 
derably more produced than in the female, and exhibiting above at the flexure 
a very distinct angular projection, distal part narrow, linear. Length amounting 
to 7 mm. 
Remarks .—The present species, first described in the year 1864 by the 
present author, may be easily recognized in both sexes by tbe evenly vaulted 
carapace, the very prominent pseudorostral projection, and the coarse serration 
of the lower edges of the carapace, which latter character has given rise to the 
specific name serrata. 
Occurrence .—Of the south and west coasts of Norway, this form is by 
no means unfrequent, occurring in some places, for instance in the Christiania 
Fjord, rather abundantly in depths ranging from 30 to 100 fathoms, muddy 
bottom. Its northern distribution extends to Hasvig in west Finmark, and I 
have found it there, as also in some other places, down to a depth of 300 
fathoms. Male specimens (in the adult state) are found at some periods of the 
year not infrequently. They are extremely agile and in almost constant motion. 
Distribution .—Off the Skagen Lighthouse (Meinert). 
12. Diastyloides biplieata, G. O. Sars. 
(PI. XLVI). 
Diastylis biplieata, 6. 0. Sars, Om den aberrante Kvebsdyrgruppe Cuniacea, p. 46. 
Syn: Diastylis lamellate, Norman. 
„ Diastylis Calveri, Norman (adult male). 
Sjtecific Characters. — Female. General form of body resembling that of 
the preceding species, anterior division, however, still more tumefied, approaching 
the globular shape. Carapace large and broad, the width considerably exceeding 
the height, dorsal face somewhat gibbously vaulted behind, lateral faces sculptured 
with 2 very distinct oblique plicae extending from the most prominent part of the 
branchial region, and joining at the anterior part of the lower edge, hind edge 
of carapace elevated to a similar plica; pseudorostral projection rather large and 
slightly upturned, being somewhat hollowed at the base, subrostral corners in¬ 
conspicuous, anterior half only of the lower edges coarsely serrate. Exposed seg¬ 
ments of trunk with the anterior edge more or less distinctly elevated, lateral 
parts of last segment scarcely produced behind, though terminating in an acute 
corner. Caudal segments simple, unarmed. Superior antennae with the peduncle 
