CRUSTACEA CASPIA. 457 



in the posterior ones (fig. 1 5) appears somewhat more elongated than in the 

 anterior (fig. 14), and lias the palm more transverse. In the male both pairs 

 (figs. "23, 24) are considerablj' larger, though not particularly strong. The 

 propodos of the anterior ones (fig. 23) is oblong in form, with the i)alm 

 very oblique and somewhat concave, that of the posterior ones (fig. 24) is 

 a little larger, and widens slightly distally, with the palm nearly transverse. 

 ' The pereiopoda are moderately slender, and have their outer part edged 

 with fascicles of slender bristles. The 2 anterior pairs (fig. 16) are consider- 

 ably smaller than the 3 posterior ones (figs. 17 — 19), which exhibit a very 

 uniform appearance, the basal joint in all of them being oval in shape. Tiiat 

 of the last pair (fig. 19), unlike what is generally the case, is only very 

 slightly expanded, and scarcely differs either in size or shape from that of 

 the penultimate pair (fig. 18). 



The 2 anterior pairs of lU'opoda (fig. 21) have the outer ramus a little 

 shorter than the inner, both being tipped by a number of rather slender 

 spines. 



The last pair of uropoda (fig. 20) are highly remarkable for their great 

 length, being almost twice as long as the urosome. The outer ramus is rather 

 narrow, and sub-linear, and exhibits on each side 5 fascicles of slender 

 spines. Its terminal joint is well defined, spiniform, and carries a few slen- 

 der bristles on the tip. The inner ramus is very small, and scale-like. 



The telson (fig. 22) is comparatively small and abruptly narrowed in its 

 outer part. The cleft is rather wide, and the lateral lobes obtusely pointed. 

 They are each armed with 3 apical, and 2 lateral spinules, one of which, 

 however, has more properly the character of a bi"stle. 



Occurrence. — Several specimens of this form were collected by Dr. 

 Grimm at Stat. 62, lying at some distance south of Baku, the depth being 

 6 fathoms. 



16. Gamniarus placidus, Grimm, MS. 



(PI. 8, figs. 1—12). 



Specific Characters. — Body extremely slender, though less compressed 

 than in G. tenellus. Cephalon with the lateral lobes produced in front to a 

 very acute somewhat deflexed point. Coxal plates not very large. Last pair 

 of epimeral plates of metasome but slightly produced at the lateral corners. 

 Urosome densely spiuulose above. Eyes of a rather unusual form, being very 

 narrow, and occupying almost the whole height of the front part of the cephalon, 

 their lower part slightly dilated. Antenuie very slender, and densely setifer- 

 ous, tlie superior ones longer than the inferior, and having the accessory 



"tMS.-Mar. CTp. 2S7. 37 



