356 G- 0. SARS, 



erior ones beiug the larger, palm in both pairs luore oblique tlian in the 

 female, and having in the middle, outside, a strong spine. Pereiopoda of a 

 similar structure to that in G. compirssus. except that the basal joint of 

 the last pair is somewhat more expanded. Last i)air of uropoda with the 

 inner ramus rather small, the outer elongated and having the terminal joint 

 poorly developed. Telson not as long as it is broad at the base, each half 

 with 2 small apical spines. Length of adult female 9 mm., of male about 

 tlie same. 



Tkmarhs. — The present species is nearly allied to G. compresses, but 

 on a closer examination is easily distinguishable by its far less compressed 

 body, the different form of the 1st and 4th pair of coxal plates, and the 

 likewise rather different structure of the last pair of ui'opoda. It also bears 

 some resemblance to the form described by Mr. Sowinsky from the Azow 

 Sea, as G. maeoticHS, which latter species also occurs in the Caspian Sea, 

 and is represented by several well marked specimens in the collection of 

 Dr. Grimm. 



Description of the female. 



The length of adult, ovigerous specimens amounts to 9 mm., and this 

 form accordingly grows to a somewhat larger size than the preceding 

 species. 



The form of the body (see fig. 11) is, as in the latter, rather slender, 

 but considerably less compressed, the back beiug broadly vaulted and quite 

 smooth throughout. 



The cephalon does not fully attain the length of the first 2 segments of 

 niesosome combined, but has the lateral lobes rather pi-ominent and obtusely 

 rounded at the tip, being defined behind by a rather deep emargination. 



The anterior pairs of coxal plates are of moderate size and densely seti- 

 ferous on their distal edge. The 1st pair (see fig. 13) differ not a little in 

 their shape from those in G. compressus, being only very slightly expanded 

 distally, and nearly transversely truncated at the tip. Also the 4th pair (see 

 fig. 15) are markedly distinguished in being far less expanded in their 

 outer part. 



The epimeral plates of the metasome are nearly of same appearance as 

 in the above-mentioned species. 



The urosome, on the other hand, appears considerably more elongated 

 and slender than in that species, and has on each side of the last segment 

 2 minute spinules. 



The eyes are comparatively a little larger than in G. compressus and of 

 a more pronounced oblong reniform shape. 



$e3.-MaT. cTp. 336. 14 



