CRUSTACEA CASPIA. 433 



Telson of moderate size, deeply cleft, lateral lobes obtusely pointed, and 

 having each 2 lateral, and 2 apical spines. Length of adult female 5 mm. 



Remarks. — The external appearance of this form looks rather different 

 from that in the other species, and I was therefore at first in some doubt 

 about its true place. Having, however, subsequently examined some of the 

 appendages more closely, I find it to be referable to the genus Gmelina, 

 though representing a somewhat anomalous species. 



Description. — The length of the solitary specimen examined, which is 

 an adult female with fully developed incubatory lamellfe, measures only 

 5 mm., and this form is accordingly much the smallest of the 4 species as 

 yet known. 



The body (see fig. 13) is rather sliort and stout, somewhat compressed, 

 and perfectly smooth throughout, without any trace of tubercles or dorsal 

 expansions. 



The cephalon (see fig. 14) nearly equals in length the first 2 segments 

 of the raesosome combined, and is gradually narrowed in front. The rostral 

 projection is rather small, though distinct, and the lateral lobes are angu- 

 larly produced in front. 



The anterior pairs of coxal plates are much deeper than the correspond- 

 ing segments and edged with scattered bristles. The 1st pair (see fig. 16) 

 are of a simiewhat unusual form, being obliquely expanded, so as to form 

 in front a linguiforra lobe advancing over the oral parts and the basal joint 

 of the inferior antenuie. The 2 succeeding pairs (see fig. 17) are oblong 

 quadrangular in shape, and of nearly equal size. Tiie 4th pair (see fig. 13) 

 are less deep than the preceding (uies, and scarcely broader, being obliquely 

 truncated at the tip, with a very slight emargination behind. The posterior 

 pairs are very small. 



The epimeral plates of the metasome are normally developed, the 1 st 

 being rounded, the other 2 nearly rectangular. 



The urosome is quite smooth, with no trace of spines or bristles dorsally. 



The eyes (see fig. 14) are of moderate size, and rounded oval in form, 

 with dark pigment and well-developed visual elements. They are placed un- 

 usually far down, close to the lateral corners of the cephalon. 



The superior antennae (fig. 1 5) are rather feeble, scarcely exceeding in 

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

 and have the 2nd joint of the peduncle about as long as the 1 st, whereas 

 the 3rd joint is scarcely half as long. The flagellum equals in length the 

 peduncle, and is composed of 7 articulations. The accessory appendage is 

 extremely small, and uniarticulate. 



$H3.-MaT. CTp. 263. I J 



