CRUSTACEA MALACOSTRACA. III. 87 



3-jointed, not much shorter than the peduncle, and its terminal joint considerably longer than the 

 second. — The antennal squama very small, much broader than long. 



Lateral processes of second thoracic segment reach as far forwards as the front margin of first 

 segment; each process terminates in a small spine inserted on the obtuse end. The peculiar furrows 

 on the four anterior segments are shown on fig. 2 a. 



Abdomen distinctly broader than the posterior thoracic segments, about one-third as broad 

 again as long. The lateral margins proximally somewhat convex and then slightly converging to the 

 postero-lateral angles which protrude as somewhat small triangular corners; the posterior margin is 

 very long and considerably convex, excepting a somewhat short concave part towards the lateral 

 angles. The median part of the ventral side of the two posterior thoracic segments is vaulted, with 

 a moderately large, oblong, obtuse process (fig. 2 d) somewhat in front of the operculum, which is 

 much vaulted; the very broad median lamella of the operculum is posteriorly emarginate, and each 

 postero-lateral part produced into a long, somewhat curved and narrow, acute process directed out- 

 wards. — The uropods are very small, with the endopod a little longer than the exopod. 



Length of the single specimen 2-2 mm. 



Remarks. The male of this species is abundantly distinguished from other Asellota by the 

 keels and processes on the head, the two anterior thoracic segments and the shape of the abdomen. 

 Unfortunately the female is unknown. 



Occurrence. Taken by the "Ingolf" in the cold area. 



North of the Fjeroes: Stat. 139: Lat. 63°36' N., Long. 7°3o' W., 702 fath., temp. -=- o-6°; 1 spec. 



Nannoniscus G. o. Sars. 



This genus was established in 1869 on females of a single species taken off the Lofoten Is- 

 lands. Several years later Sars described another species, A r . bicuspis G. O. S., but in 1908 Harriet 

 Richardson with good reason removed it from A T ai/iioiiisciis and made it the type for a new genus, 

 Haploniscus Rich. In 1897 Sars established N. caspius on a male from the Caspian Sea. Such was 

 the state when Sars in his "Account" published description and figures of the type N. oblongus G. O. S., 

 thereby giving the first detailed account of a species of this genus. He described and figured not 

 only the female but, besides, an animal which he believed to be the male of the same species. His 

 two specimens supposed to be males had the testes visible through the integuments (comp. the figure 

 of this male from above on his PI. 50), while the operculum is an undivided round plate, thus 

 shaped as in a female. According to his figure his male is in reality the female of a very different 

 species, and the occurrence of testes in female specimens is certainly very interesting. But it is known 

 that in the Cymothoinae and some of the Epicaridea the specimens are first males and then females; 

 furthermore, vestiges of hermaphroditism have been found in Spkceroma, and it is undoubtedly some- 

 thing of this kind which has been found by Sars in his two specimens. My statement is sure, be- 

 cause I have both males and females of N. oblongus — and of four other species — and the first pair 

 of legs are always completely similar in both sexes, while in the specimen figured by Sars as the 



