192 



much elongated, and nearly equal in length, the superior ones with a very 

 small, uuiarticulate accessory appendage. Oral parts normal. Gnathopoda 

 in female rather feeble, though distinctly subcheliform, in male much more 

 strongly developed and subequal, propodos very large and gradually widen- 

 ing distally. Pereiopoda not very much elongated, the 3 posterior pairs 

 successively increasing in length; last pair having the basal joint somewhat 

 larger and more lamellar than in the 2 preceding pairs. Last pair of uro- 

 poda more or less projecting beyond the others, and having the outer ramus 

 well developed and more or less pronouncedly foliaceous in structure, inner 

 ramus small, squamiform. Telson deeply cleft. 



Bcmarks. — The present genus is very nearly allied to the genus 

 PallasicUa G. 0. Sai's {Pallasia Sp. Bate), and indeed at first, before the 

 collection of Dr. Grimm was come in my hands, I referred the 2 species 

 described below to that genus. There is, however, perhaps some raisou for 

 supporting the new genus proposed by Dr. Grimm, since the said species 

 exhibit some apparently essential points of difference from the type of the 

 genus PallasieUa, for instance the much feebler structure of the gnathopoda, 

 and the fact, that the telson is deeply cleft, uot as in the latter genus only 

 emarginated at the tip. 



Besides the form upon which Dr. Grimm founded his genus, another 

 very distinct species is contained in the collection of Mr. Warpachowsky, 

 and this species has recently also been recorded from the Azow Sea by 

 Mr. Sowinsky. 



2. Gmelina costata, Grimm, MS. 

 (PI. III). 



Specific Characteristic. — Body extremely slender and compressed, 

 especially in the male, with the lateral parts of the segments of mesosome 

 somewhat exstant; back keeled throughout, the keel being elevated in the 

 posterior segments of mesosome and those of metasome to conspicuous dorsal 

 projections. Urosome unusually elongated, and having each of tlie 2 anterior 

 segments produced dorsally to a small dentiform projection. Cephalon with 

 the lateral faces quite smooth, rostral projection well-marked, lateral lobes 

 but very little projecting and broadly truncated at the tip. Anterior pairs 

 of coxal plates in female much deeper than the corresponding segments, in 

 male considerably smaller; 4th pair but little broader than the preceding 

 pair. Second pair of epimeral plates of luetasome I'ather deep and acutely 

 produced, last pair somewhat smaller and less produced at the lateral corners. 

 Eyes of moderate size and but slightly protuberant, oval reuiform, with dark 

 pigment. Superior autennse a little longer than the inferior, but scarcely 



$H3.-MaT. CTp. 192. j4 



