47 



in both sexes. Mandibular palp with the outer ramus shorter than the inner, 

 forming a rather broad undivided plate fringed with the usual number of strong 

 plumose setae. Endopodal part ol maxillae with the terminal joint distinctly 

 subdivided. Posterior maxillipeds composed of 3 well defined joints. The 4 

 anterior pairs of legs more perfectly developed than in Doropygns and appar- 

 ently adapted for swimming, at least in the male; both rarni 3-articulate. Last 

 pair of legs built on the same type as in Doropygns. 



Remarks. This new genus is established, to include the form recorded 

 by Aurivillius under the name of Doropygns longicanda. A closer examination 

 of this form, and more particularly of the hitherto unknown male sex, has 

 led me to the conclusion, that it more properly should be separated generically 

 from Doropygns. The genus, though undoubtedly referable to the present 

 family, exhibits a closer affinity to the Notodelphyidce, than does any of the 

 other genera here treated of, and apears indeed in some respects to form a 

 connecting link between these 2 families. 



12. Doropygopsis longicauda, (Aurivillius). 



(PI. XXIII). 



Doropygus longicauda, Aurivillius, Bidrag til kannedomen om Krustaceer, som lefva hos 

 Mollusker och Tunieater, p. 18, PI. III. 



Specific Characters. Female. Body rather slender and only slightly 

 compressed, exhibiting the usual ventral curvature. Head comparatively large, 

 fully attaining the length of the 2 succeeding segments combined, with the lateral 

 edges evenly curved in front, but almost straight in the middle; rostral pro- 

 minence very small. Incubatory pouch well developed and rather prominent 

 behind, with the extremity quite evenly rounded. Tail about half the length of 

 the anterior division, and narrow cylindrical in form, last segment smaller than the 

 others and nearly transversely truncated at the end. Caudal rami slender and 

 narrow about twice the length of the anal segment, and provided at the obtusely 

 pointed tip with 4 well defined, though comparatively small setae; 2 minute bristles 

 moreover present on each ramus the one attached to the outer edge at a short 

 distance from the base, the other occurring inside nearer the apex and somewhat 

 dorsally. Anterior antennae shorter than the head and, as usual, deflexed, 

 being composed of 9 well defined joints rather densely clothed with setae; 1st 

 joint with 2 very strong plumose setae near the end; 2nd joint without any 

 spines. Posterior antennae with the basal and terminal parts sharply marked 



