330 C. 0. SARS, [n. S. IT 



The 2 pairs of pleopoda (figs. 8 and 9) exhibit tlie structure characte- 

 ristic of the geuus. 



The uropoda (fig. 10) are comparatively still larger than in the female, 

 and have the setce of the scape considerabl}^ more elongated. The rami ex- 

 ceed ill length the scape, and the inner one has a very great number of small 

 spiuules on the inner edge. 



The telson (fig. 1 1) exhibits the same nearly quadrate form as in the 

 female. 



Colour. — The specimens examined were all quite devoid of any colour- 

 ing marks, exhibiting a uniform whitish tinge. 



Occurrence. — This pretty species has been stated to occur in 6 different 

 Stations, but in most of them only solitary specimens were secured. Of the 

 Stations two (St. 48 and 58) are located in tlie western part of the North 

 Caspian Sea; the 3rd (St. 32) about midway between the peninsula jMangy- 

 schlak and the opposite western coast; the 4th (St. 16) off the island of 

 Swjatoj; the 5th (St. 53) North of the islands of Kulaly and Morskoj; and 

 the 6th (St. 61) in the most northern part of the Caspian Sea, at some 

 distance south of the Bay Bogatyj Kultuk. 



9. Pseudocuma eudorelloides, G. 0. Sars, u. sp. 



(PI. XII, figs. 1 — 10). 



Specific Characteristics $. — Body not nearly so slender as in the last 

 described species, and having the anterior division less sharply marked off 

 from the posterior, and of a somewhat club-shaped form. Carapace not very 

 large, but rather deep, with the branchial regions well defined, and sharply 

 marked off from the gastric area; the latter with 2 slight longitudinal keels, 

 and having the ocular lobe very short and broad, with only 2 small cornese 

 placed far apart; pseudo-rostral projection sliort and obtuse, being cleft by a 

 deep incision in front, as in P. hilameUata; antero-lateral corners nearly rect- 

 angular. Exposed part of trunk evenly vaulted above, without any keel or pro- 

 jections. Metasome of moderate length, scarcely exceeding that of the anterior 

 division of the body. Antenna?, oral parts and legs somewhat resembling 

 tliose parts in P. lilamellata. Uropoda not very large, with the inner ramus 

 shorter than the outer, and having inside only 5 small spinules, outer ramus 

 about the length of the scape. Telson nearly semicircnlar in form, the edge 

 being divided into a few dentiform projections. Length of adult female 

 scarcely attaining 5 mm. 



Remarks. — The present form bears a perplexing resemblance in its 

 outward appearance to the species of the geuus Eudorella, or perhaps still 

 more to those of the genus Eudorellopsis. It is however a true Pseudocuma, 



Melanges biologicmes. T. XIII, p. 491. 



