CRUSTACEA CASl'IA. 4:63 



densely clothed with delicate curved bristles; the 3 posterior pairs likewise 

 rather robust, and having their outer part edged with strong spines accom- 

 panied by slender bristles; basal joint of last pair rather large, oval. Last 

 pair of uropoda not-*iuch elongated, outer ramus sub-foliaceous and densely 

 setiferous, inner ramus about half the length of the outer. Telson with the 

 lateral lobes rather narrow, and each armed with 3 apical spines. Length 

 of adult male 1 1 mm. 



Bemarhs. — In its general appearance, this form somewhat resembles 

 G. aralensis Uljauin'), from which however, it, is easily distinguishable 

 by the perfectly smooth urosome, and by the somewhat different structuie of 

 the posterior pairs of pereiopoda. It also comes rather near to G. abbreviatus 

 G. 0. Sars; but its nearest ally would seem to be G. mceoiicus Sowinsky, 

 to be described later. 



Description. — The length of the largest male specimens measures about 

 11 mm., and this form is accordingly rather inferior in size to the Caspian 

 variety of G. aralensis. 



The form of the body (see fig. 1 ) appears on the whole to be rather 

 robust and somewhat tumid, with the back broadly rounded and perfectly 

 smooth throughout. 



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

 mesosome combined, and has the lateral lobes but slightly prominent, and 

 obliquely rounded. 



The anterior pairs of coxal plates are rather large, and densely fringed 

 distally with slender bristles. The 1st pair (see fig. 4) are distinctly ex- 

 panded in their outer part, and accordingly somewliat broader than the 

 succeeding pair (see fig. 5), which, on the contrary, are slightly narrowed 

 distally. The 4th pair are exceedingly broad, with the posterior expansion 

 rather prominent, and transversely truncated at the tip. 



The last 2 pairs- of epimeral plates of the metasome are of sanu; shape, 

 and but slightly produced at the lateral corners. 



The urosome is perfectly smooth above, with only 2 very small juxta- 

 posed spinules on each side of the last segment, at the base of the telson. 



The eyes are of moderate size, and are oval reniform in shape, with 

 dark pigment. 



The superior antenna3 (fig. 2) are rather short, scarcely exceeding in 

 length the cephalon and the first 2 segments of the mesosome combined, 

 and have the 1st joint of the peduncle rather massive, exceeding in length 



1) This species has becu desciilicd by the ijiesciit author iu liis 2nd article on the Caspian 

 Amphipoda as G. robusioichs, Grimm. 



•tua.-SUT. wp. 293. t\ 3 



