?)02 «. 0. SAKS, 



cliansky, 3 others (St, 53, 54, 56) nortli autl west of the island Kiihily, tlie 

 remaiuing 6 Stations (St. 61, 63, 64, 66, 69, 86) in the eastern part of 

 tlie basin. At two of the Stations (St. 63 and 69) it occurred in great abun- 

 dance. 



The species is also rather abundantly represented in the collection of 

 Dr. Grimm, having been collected in several localities both of the southern 

 and middle part of the Caspian Sea, the depth ranging from 6 to 44 fathoms. 



25. Corophium curvispinum, G. 0. Sars, n. sp. 

 (PI. xiir, fig. 1—9). 



Specific Characters. — Frontal edge of cephalon slightly angular in the 

 middle, lateral lobes rather prominent and narrowly rounded. First pair of 

 coxal plates witli 3 slender bristles at the tip. Urosome witli the 2 outer 

 segments less distinctly defined. Superior antennie in female comparatively 

 sliort, not attaining Vg of the length of the body, and but sparingly setons, 

 1st joint of tlie peduncle with 4 — 5 spinules below, flagellum shorter than 

 the peduncle; tliose in male much more fully developed, and having the ped- 

 uncle densely setiferous below, its 2nd joint much elongated, being fully as 

 long as the 1st, flagellum scarcely exceeding the lengtli of tlie 2 outer ped- 

 uncular joints combined. Inferior antenna' much larger in male tlian in 

 female, attaining in tlie former almost the wliole lengtli of the body, pen- 

 ultimate joint of tlie peduncle gradually widening distally, and produced at 

 the end posteriorly to a strongly incurved spiniform projection, at tlie base 

 of which is a short, sliglitly bilobed expansion ; last peduncular joint nearly 

 as long as the penultimate one, and having near the base inside a short re- 

 curved prominence, but no spine at the end; flagellum shorter than tlie last 

 peduncular joint. Tlie 2 anterior pairs of pereiopoda comparatively short 

 and stout, with the meral joint much expanded. Last pair of pereiopoda 

 moderately slender and of the usual structure. Uropoda and telson nearly 

 as in G. chelicorne. Length of adult female 6 mm., of male 7 mm. 



Bemarks. — As in the other species, the most prominent distinguisliing 

 cliaracter is also in this form the structure of the inferior antenna, wliicli 

 is rather peculiar, and, as usual, more pronounced in tlie male tlian in the 

 female. Moreover tlie structure of the superior antenna in tlie male and 

 tliat of tlie 2 anterior pairs of pereiopoda will serve to easily distinguish 

 tills species from any of the 2 preceding ones. 



Bescripiion. — The length of fully adult, ovigerous females does not 

 exceed 6 mm., that of males being about 7 mm., and this form accordingly 

 is still somewhat smaller than C. chelicorne. 



4'H3.-MaT. CTp. 210. 28 



