43 



Tail about equalling in length half the anterior division, and apparently com- 

 posed of 5 segments, the last one cleft by a deep angular insision into 2 

 diverging triangular lappets, carrying on the tips the caudal rami. The latter 

 nearly twice as long as the anal segment, and of a narrow blad-llke shape, 

 tapering distally, and terminating in an obtuse point, on which slight rudiments 

 of 3 or 4 setae may be observed. Eye very small, but easily observable in 

 the living animal. Anterior antennas scarcely attaining the length of the head, 

 and apparently composed of 8 joints clothed with comparatively short setae, 

 some of the joints exhibiting slight traces of a sub-division, the first 2 much 

 larger than the others. Posterior antennae rather slender and quite smooth, 

 except at the tip, which is armed with a very strong curved claw accompanied 

 by a small bristle. Endopodal part of maxillae with 3 setae inside the base; 

 terminal joint comparatively small, quadrangular in form, and only provided 

 with 2 setae. Anterior maxillipeds with the terminal part well developed, and 

 composed of 3 well defined joints. Posterior maxillipeds much reduced in 

 size, each forming an undivided oval lamella clothed inside and at the tip 

 with a number of thickish plumose setae. The 4 anterior pairs of legs with 

 the rami comparatively short and broad, the inner one in 1st pair distinctly 

 3-articulate, in the succeeding pairs however only biarticulate, the 2 outer joints 

 being confluent. Last pair of legs with the distal joint somewhat cultriform 

 in shape, and armed outside near the end with 3 small denticles, apex blunted 

 and, as usual, provided with a spine and a very thin bristle. 



Male of very small size, as compared with the female, and having the 

 body gradually tapered behind, though curved in a similar manner. Structure 

 of the several appendages much as in female. 



Body of female, when alive, rather pellucid, with a slight whitish gray 

 hue, ripe ova in the incubatory pouch generally of a dark fuscous or violace- 

 ous colour. 



Length of adult female attaining 3.80 mm.; that of male scarcely ex- 

 ceeding 1.50 mm. 



Remarks. The present species is the type of the genus Doropygus, and 

 may be easily recognised by the characteristic shape of the incubatory pouch 

 in the female. The form recorded by Buchholtz from the Mediterranean under 

 the name of D. pulltis is evidently identical with Thorell's species. On the 

 other hand, are the figures given by Brady on PI. XXVIII in his monograph 

 scarcely referable to the present species, but more properly to an immuture 

 specimen of D. porcicauda. 



