49 



Phallusia obliqua. The animal, when alive, is rather more mobile than the 

 other Doropygidae, and even females encumbered with ripe ova are seen, when 

 loosened from their holds, moving to some extent freely in the water, though 

 in a rather clumsy manner. The males are much more agile and are scarcely 

 in this respect overmatched by the Notodelphyidae. Indeed, one of the male 

 specimens obtained was found out of his host, swimming quickly about 

 together with other free-living Copepoda. 



Distiibution. Coast of Bohuslan (Aurivillius). 



Gen. 5. Doropygella, G. O. Sars, n. 



Generic Characters. Body comparatively short and stout, being scarcely 

 at all compressed. Head remarkably large and broad, produced in front to a 

 deflexed conical rostrum. Incubatory pouch not much prominent. Tail composed 

 in both sexes of 4 segments, the last of which is transversely truncated behind. 

 Caudal rami quite simple, terminating in a blunt point, and without any 

 distinctly defined setae. Anterior antennae short and deflexed, with the proximal 

 joints very broad and compressed; those in male not transformed. Posterior 

 antennae strongly built and nearly smooth, apical claw well developed. Mandi- 

 bular palp with the outer ramus undivided. Endopodal part of maxillae with 

 a distinctly defined terminal joint extending outwards along the exopodal la- 

 mella. Anterior maxillipetls rather robuste, but with the terminal part poorly 

 developed. Posterior maxillipeds distinctly 3-articulate. The 4 anterior pairs 

 of legs of comparatively small size and not adapted for swimming, basal part 

 broad and flattened, rami in all the pairs 3-articulate, but rather short, with 

 the setae poorly developed. Last pair of legs small, with the distal joint scale-like. 



Remarks. This genus also is founded upon a single species detected by 

 Aurivillius and referred by him to the genus Doropygus. Several peculiarities 

 found in this species, both as regards the outward appearance of the body 

 and the structure of some of the appendages, have however led me to the conclu- 

 sion, that it more properly ought to be regarded as the type of a separate genus. 



13. Doropygella Thorelli, (Aurivillius). 



(PI. XXIV) 

 Doropygus Thorelli, Aurivillius, I. c. p. 45, PI. V. 



Specific Characters. Female. Body of a rather short and clumsy form, 

 exhibiting the usual ventral curvature. Head unusually large and expanded, 

 exceeding both in height and width the adjoining part of the trunk, seen 



7 Crustacea 



