CRUSTACEA CASPIA. 461 



The cqihaloii is comi)arativel3^ small, not nearly attaining the length of 

 the first 2 segments of tlie mesosome combined, and has the lateral lobes 

 rather broad and transversely truncated at the tip. 



The anterior paice of coxal plates are nearly twice as deep as the cor- 

 responding segments, and densely fringed with setae on their distal edge. 

 They are rather unequal both as to size and shape. The 1st pair are much 

 the smallest, and exhibit a somewhat unusual form, being gradually narrowed 

 distally, with the tip obtusely pointed, and extending obliquely forwards. 

 The 2nd pair are somewhat larger than the 1st, and more deflexed, but are 

 likewise considerably narrowed distally. The 3rd pair are much larger, and 

 of the usual oblong quadrangular form. The 4th pair are still larger, nearly 

 as broad as they are deep, and distinctly emarginated posteriorly in their 

 upper part, the eraargination being defined below by a projecting corner. 



The epimeral plates of the metasome are of moderate size, the 2nd pair 

 being the deepest, and exhibiting in their anterior part a dense fringe of 

 delicate, curved bristles. The last pair are but little produced at the lateral 

 corner, and, like the preceding pair, nearly rectangular. 



The urosome has on each of its segments dorsally, 2 small, juxtaposed 

 spinules. On tiie last segment there is also a single lateral spinule (see 

 fig. 17). 



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

 somewhat obliquely. 



The superior antennae are rather short, scarcely exceeding in length the 

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

 1st joint of the peduncle about as long as the other 2 taken togetlier. The 

 flagellum (see fig. 1 5) does not attain the length of the peduncle, and is 

 composed of 12 articulations. The accessory appendage is about 'g as long 

 as the flagellum, and 4-articulate. 



The inferior antennae are fully as long as the superior, perhaps even a 

 little longer, and exhibit the usual structure. 



The gnathopoda are very unequally developed, the posterior (fig. 16) 

 being much larger than the anterior, and exhibiting a rather anomalous 

 structure somewhat recalling tliat in the genus Pandorites. As in that 

 genus, the carpus is very small, whereas the propodos is of exceedingly large 

 size, and somewhat flattened, being gradually expanded distally, whereby it 

 acquires an almost triangular form. The palm is rather oblique and evenly 

 curved, bt.ug provided, somewhat within the edge, with a dense and regular 

 series of strong, spiniforra bristles. The defining angle is very slight, and 

 armed witli 3 strong spines, one of which is rather elongated. The 

 hind margin of the propodos, which is somewhat shorter than the palm, 



'rii3.-M;iT. CTp. 391. 41 



