168 



that species and slightly constricted near the base, terminal lobes without 

 any dorsal denticles, but each with 3 small marginal spinules near the tip. 

 Body whitish, pellucid, and having anteriorly on the sides of the 1st pair of 

 coxal plates a most conspicuous carmine-coloured patch, and a few light yel- 

 lowish specks. Length of adult female scarcely exceeding 8mm, of male 

 about the same. 



Remarks. Though very nearly allied to the preceding species, this 

 form may, on closer examination, be readily distinguished by the very slender 

 and elongated inferior antennae, by the form of the cephalon, and by the very 

 slight and rounded dorsal carina on the 1st segment of the urosome. The 

 males of both species are rather similar, though, on closer inspection, easily 

 distinguishable by the different form of the dorsal carina of the 1st segment of 

 the urosome. Boeck has erroneously identified this species with the Araneops 

 diadema of Costa. I have been enabled to examine the latter form, which 

 was collected by me, many years ago, in the gulf of Naples, and have 

 convinced myself that it is specifically distinct and more nearly allied to the 

 following species. On the other hand, Boeck was certainly right in referring 

 the A. Ifeviyata of Sp. Bate to this species. 



Occurrence. - This is by far the commonest of the Norwegian species 

 of Ampelisca, occurring in great abundance along the whole south and west 

 coasts of Norway, at least to the Trondhjemsfjord, in depths varying from 

 30 to 100 fathoms, muddy bottom. 



Distribution. British Isles (Sp. Bate), Kattegat (Meinert), Bohuslan 

 (Bruzelius). 



3. Ampelisca assimilis, Boeck. 



(PI. 58, fig. 2). 

 Ampelisca assimilis, Boeck, Crust, ainphip. bor. & aretiea, p. 142. 



Cephalon a little exceeding in length the 3 anterior segments of meso- 

 some combined, gradually tapering distally, frontal part rather produced and 

 less curved anteriorly than in A. tcnuicornis, tip somewhat obliquely truncated. 

 First pair of coxal plates but slightly expanded distally ; 4th pair much more 

 deep than broad, lower edge transversely truncated, and shorter than the hind 

 margin. Last pair of epimeral plates of metasome obtusely rounded at the 

 lateral corners. First segment of urosome witli a deep saddle-shaped depres- 

 sion in the middle dorsally, behind which there is a rather high and evenly 

 rounded carina. Eyes about as in A. tenuicornis. Superior antennse in female 

 about the length of the cephalon and the 3 anterior segments of mesosome 

 combined, and reaching a little beyond the peduncle of the inferior ones, 2nd 

 joint of the peduncle scarcely twice the length of the 3rd, flagellum more 



