CRUSTACEA CASPIA. 477 



Tlie 2nd pair of maxillfe (tig. 19) are nearly as large as the 1st pair, 

 and quite normal in stjHicture. 



The maxillipeds (tig. 20) have the. hasal and masticatory lobes of moderate 

 size, the latter being armed inside with a row of flattened spines. The palps 

 are but sparsely setous, and have the dactylar joint quite rudimentary, 

 only represented by a small nodule carrying 2 minute hairs. 



The gnathopoda (figs. 21, 22) are rather feeble in structure, and some- 

 what unequal, the posterior ones being considerably more elongated than 

 the anterior. The latter (fig. 2 1 ) are rather short, and have the propodos 

 comparatively small, oval quadrangular in form, and slightly narrowed dis- 

 tally, with the palm nearly transverse. The posterior gnathopoda (fig. 22) 

 have both tlie carpus and the propodos considerably more elongated, the 

 latter being nearly linear in form, with the palm extremely short and trans- 

 verse. Both pairs are provided with scattered fascicles of slender bristles. 



The pereiopoda are of moderate length, and almost naked, with only a 

 few very small and scattered hair-like bristles. In all of them the dactylus 

 is very strong, hookshaped, and terminating in a very acute point. The 2 

 anterior pairs (fig. 23) are exactly alike, and have the meral joint somewhat 

 expanded distally. Tiie 3 posterior pairs successively increase somewhat in 

 length, and have the basal joint but slightly expanded and of oval form. In 

 the last pair (fig. 27) this joint is not very difierent either in sliape or size 

 from that of the penultimate pair. 



The 2 anterior pairs of uropoda (fig. 25) are rather strongly built, with 

 the rami subequal and armed at the tip with several, partly hooked spines. 



The last pair of uropoda (fig. 26) are extremely small, scarcely projecting 

 beyond the others at all. The outer ramus is scarcely longer than the basal 

 part, and only provided with a few slender bristles; its terminal joint is so 

 very minute, as easily to be overlooked. The inner ramus is much 

 smaller than the outer, scale-like, and only provided with a single apical 

 bristle. 



The telson (fig. 27) is very short, being fully twice as broad as it is 

 long, and exhibits an almost semi-lunar form, though being divided by a 

 narrow cleft into 2 halves, each of which lias a small apical, and 2 lateral 

 hairs. 



Occurrence. — Of this peculiar Amphipod, a solitary specimen was taken 

 as early as in the year 1877 by v. Baer off the peninsula Mangyschlack. 

 Another specimen is contained in the collection of Dr. Grimm, with the 

 statement of having been taken at Stat, 116 within the 'mantle of Cardium 

 Baeri. Solitary specimens were also found in the collections of Mr. War- 

 pachowsky, taken from Stat. 16 and 31 of the North Caspian Sea. 



'I'ua.-MuT. CTp. 307. 57 



