CRUSTACEA MAMCOSTRACA. 111. 23 



The species was formerly known from Baffin Bay, LaL 67*59' N I Long- 56*33* W., 98 falh. 

 (Bovalliiisi, and from two places in Davis Strait, viz.: LaL 66 C 32' N., 5534' W., xoo fath., and LaL 

 6 535 N I-ong. 5450' W., 80 fath. (H. J. Hansen). Besides, it has been secured by Admiral Wandel at 

 a place north-west of Iceland: LaL 66i6' N, Long. a6 9 8 W., 330 fath., temp, -f cri, i spec. 



Distribution. Hitherto known only from Banquereau, LaL 44 45 N., about Long. 58" W. 

 (Harger), 



Acanthaspidea stebb. 



The name of the genus has been given by Stebbing in 1893 instead of Acanthoniscus G. O. San, 

 which was preoccupied. Only the type species is to hand. 



The genus is allied to /anira, but differs in the following characters. The maxillipeds (H. I, 

 *ig. 6 a) have the second joint of the palp very moderately expanded, and it is very much narrower 

 than the broad lobe of the second joinL First pair of legs not prehensile, subsimilar to the other pairs; 

 seventh joint of all pairs moderately long (fig. 6 c), the claw somewhat strong and rather long, the 

 accessory claw slender. In the male the median lamella of the operculum (fig. 6d) tapers from the 

 moderately broad base to near the end, which is slightly widened; female operculum somewhat produced 

 behind. Uropods moderately large, with the exopod quite small. 



Janthofsis Bedd. and probably Jolanthe Bedd. must be united with Acanthaspidea. A revi.Mon, 

 based on the study of the appendages, of a good number of genera established in the literature as 

 more or less allied to /anira and Acanthaspidea, is much needed. 



9. Acanthaspidea typhlops G. O. Sars. 



(PL I, figs. 6 a 6 e.) 



1879. Acanthonucu* typhlops G. O. Sars, Arch. L Math, og Naturv. VoL 4, p. 434. 

 ! 1885. G. O. Sars, North-Atl. Exp. p. 119; PI. X, figs 27 30. 



Sars has published a detailed description with four figures of the female, but he did not know 

 the male. A few corrections and additions may be given here. 



Sars said of the antennae: "The 2 first joints of the peduncle jut forth on the outer side, as a 

 strong, oblique, outward-directed, spiniform projection", and this description agrees with his fig. 27, but is 

 not correcL Sars has overlooked the first joint, which is very short and without any process; the proctM 

 from the real second joint is very long, while the "projection" from the third joint is somewhat shorter 

 and not a process, but the nearly spine-shaped exopod or squama marked off by a distinct articulation. 



Of the thoracic segments Sars said in the diagnosis: "Epimera on ist segment simple pointed, 

 on the 3 succeeding segments two-lobed, on the 3 posterior three-lobed". But he did not distinguish 

 between the different nature of some of the lobes. The lobes on the four anterior segments are only 

 lateral expansions of the segments, and real cpimeral plates or processes, projecting from the basal 

 joint of the legs, are quite wanting. The three posterior segments are laterally strongly expanded, 

 and each expansion is bifid, so that the two anterior of the "lobes" originate from the segment in 

 question, while the posterior, much shorter lobe (fig. 6 b, >p) is an epimeral plate, thus a process from 



