CRUSTACEA CASPIA. ■ 347 



and impinges, when closed, witli tlie tip inside the inferior corner of the 

 propodos. 



The pereiopoda Exhibit exactly the same structure as in the female. 



The last pair of uropoda are perhaps a little larger, but otherwise do 

 not differ in their structure from those in the female. 



Occurrence. — This form has been collected by Mr. Warpachowsky 

 in 9 different Stations of the North Caspian Sea. Of these, one (St. 50) is 

 located off the Tschistyi-Bauk, another (St. 61) far north, outside the Bai 

 Bogatuj Kultuk, 2 others (St. 54, 55) at some distance north of the islands 

 Kulaly and Morskoy, the remaining Stations (17, 21, 27, 29, 52) distri- 

 buted over the tract north of the peninsula Mangyschlak. In none of the 

 Stations did it occur in any abundance. 



In the collection of Dr. Grimm, tliis form is represented by a few spe- 

 cimens collected in the Bai of Baku, partly in quite shallow water, among 

 grass, partly from a depth of 2 — 3 fathoms. 



9. Gammarus minutus, G. 0. Sars, n. sp. 



(PI. X, figs. 1— 20). 



Specific Characters. — Body comparatively short and stout, with 

 evenly rounded back. Lateral lobes of cephalon somewhat projecting and 

 broadly rounded at the tip. Anterior pairs of cosal plates of moderate size 

 and rather densely setous at the distal edge; 1st pair very slightly widening 

 distally; 4th pair not so broad as they are deep. The last 2 pairs of epime- 

 ral plates of metasome nearly rectangular. Urosome comparatively short and 

 somewhat gibbous above, the 1st segment partly overlapping the 2nd dor- 

 sally, both having a very small dorsal fascicle of hairs; last segment with a 

 single spinulc on each side. Eyes not very large, and oblong oval in form. 

 Superior antennae but little longer than the inferior, and having the basal 

 joint rather lai'ge, flagellum about the leugtli of the peduncle, accessory ap- 

 pendage 3-articulate. Guathopoda in female comparatively small and nearly 

 equal-sized; those in male much more powerful and rather unequal, propo- 

 dos of the anterior ones obpyriform, of the posterior ones very large and 

 oval quadrangular in form. Anterior pairs of pereiopoda rather densely se- 

 tous, and having the meral joint somewhat expanded; the 3 posterior pairs 

 moderately slender; basal joint of last pair very large, forming posteriorly a 

 broadly rounded expansion somewhat projecting at the infero-posteal corner. 

 Last pair of uropoda with the inner ramus very small, outer one sublinear, 

 with a single fascicle of spines about in the middle of the outer edge; terminal 

 joint small. Telsou with the lateral lobes comparatively narrow and tipped 



$n3.-MaT. CTp. 327. 5 



