CRUSTACEA CASPIA. 191 



tory lamellae are present iu male specimens; but the branchial lamellae (see 

 tigs. 3 and 5) exhibit the very same appearance as in the female. 



Vcri/ young specimens (tig. 10), of a length of about 6 mm., ditfer from 

 the adult in all the processes of the body (also those of the cephalon and of 

 the 5th segment of mesosome) being digitiform in shape, terminating with 

 an obtuse point, and moreover iu the dorsal prominences of the segments 

 being more strongly elevated, giving tlie back a serrated appearance. In all 

 these paiticulars they exactly agree with the form named by Dr. Grimm 

 B. nasuta. 



Colour. — In none of the specimens examined any trace of pigmentary 

 ornament could be detected, all exhibiting a uniform whitish colour. In the 

 living state, however, the animal may most probably have shoAvu some 

 characteristic colouring. 



Occurrence. — This remarkable form was met with by Mr. Warpa- 

 chowsky in 4 different Stations of the North Casiiian Sea, one of which 

 (St. 7) was located at the mouth of the Bai Agrachansky, 2 others (St. 58, 

 59) between the Tschistyi-Bank and the mouth of the Wolga, and the -Ith 

 (St. Gl) far North, at some distance outside the Bai Bogutyi Kultuk. In 

 one of the Stations (58) several specimens, both males and females, were 

 secured; iu the otlier 3 Stations only solitary specimens occurred. 



In the collection of Dr. Grimm 2 adult male specimens of this form are 

 contained, found in 2 different Stations, the one located off the promontory 

 Schachowa Kosa, the other at some distance South of the peninsula Mangy- 

 schlak, the depth being in the former 7 fms., in the latter 90 — 100 fms. 

 Besides 2 immature specimens (= B. nasuia Gr.) were collected in the 

 last-named Station, and another, likewise immature specimen (= B. liystrix 

 Gr.) was procured in the southern part of the Caspian Sea, from the very 

 considerable depth of 150 fms. 



Out of the Caspian Sea this form has not yet been recorded. 



Gen. 2. Gmelina, Grimm, MS. 



Generic Characteristic. — Body slender and compressed, with rather 

 strongly incrusted integuments, and having the segments sharply defined, 

 partly also produced to conspicuous projections. Metasome and urosome well 

 developed. Cephalon but slightly projecting in front, lateral lobes compara- 

 tively small, postantennal corners well defined and rather deep. Anterior 

 pairs of coxal plates of moderate size and larger in the female than in male; 

 4th pair not very much expanded, and but slightly emarginated posteriorly 

 in their upper part. Eyes well developed and more or less protuberant, 

 being placed near the anterior edges of the cephalon. Antennae not very 



$ii3.-MaT. CTp. 101. 13 



