168 



that species and slightly (■"iistrieted near the Imse, terminal lubes without 

 any dorsal denticles, hut eacii witli 3 small niarg'inal spinules near the tip. 

 Body wliitish, pellucid, and liaviiig antei'iorly (in tlie sides of tlie 1st pair of 

 coxal plates a most conspicuous earniine-coloured jjatch, and ;i few light yel- 

 lowish specks. Length of adult female scarcely exceeding Hmm, of male 

 about the same. 



Remarlf:. — Though very nearly allied to the preceding species, this 

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

 and elongated infericn- antenna?, 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 ditt'erent form of the dorsal carina of the l.st segment of 

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

 diadenia 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 ceitainly light in referring 

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



Occ/irrencf. — 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 

 3U to 100 fathoms, muddy bottom. 



Disfrihufion. — British Isles (8p. Bate), Kattegat (Meinert), Bohuslan 

 (Bnizelius). 



3. Ampelisca assimilis, Boeck. 



(PI. 68, tig. 2). 

 Atnpelisca assimilis, Boeck, Crust, aiiiphiii. bor. I'i arrtica, p. 142. 



(!ei)hahni a little exceeding in length the 3 anterior segments of meso- 

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

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

 Fir.st pair of coxal jdates but slightly expanded distally; 4tli 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 with a deep saddle shaped depres- 

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

 rounded carina. Eyes about as in A. tenuicornis. Superioi- antennre in female 

 about the length of the ce])halon and the 3 anterior segments of mesosome 

 combined, and reaching a little be\'ond the peduncle of the inferior ones, 2nd 

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



