350 0. 0. SARS, 



The latter appendages (figs. 13, 14) are much more powerfully develop- 

 ed than in the female, and also rather unequal in size, the posterior ones 

 (fig. 14) being much stronger than the anterior, with the propodos very 

 large and of an oval quadrangular form. In the anterior pair (fig. 13) the 

 propodos is also rather large, as compared with that in the female, but much 

 narrower than in the posterior pair, and nearly obpyriforra in shape, with 

 the palm very oblique. In both pairs the palm is defined below by a distinct, 

 though somewhat obtuse angle armed with several strong spines. 



The last pair of uropoda (fig. 15) ai'e a little larger than in the female, 

 about equalling in length the urosome, but are otherwise of much the same 

 structure. 



Occurrence. — Of this form, a few specimens were collected by Mr. 

 Warpachowsky at St. 52, lying north of the island Swjatoj. This is the 

 only place where the species has hitherto been found. In the collection of 

 Dr. Grimm I liave not yet succeeded in detecting any specimen of this 

 species. 



10. Gammarus macriiriis, G. 0. Sars, n. sp. 



(PI. X, figs. 17—27). 



Specific Characters. — Body slender and quite smooth throughout. 

 Lateral lobes of cephalon somewhat projecting and evenly rounded at the 

 tip. Anterior i)airs of coxal plates rather large and closely contiguous; 1st 

 pair slightly widening distally; 4th pair very large, being fully as broad as 

 they are deep. The last 2 pairs of epimeral plates of metasome obtusely 

 produced at the lateral corners. Urosome rather slender and smooth above; 

 last segment with a small spinule on either side. Eyes of moderate size and 

 oblong oval in form. Antenuse rather short and equal-sized, but little exceed- 

 ing in length '/^ of the body, the superior ones with the 1st joint of the 

 jieduucle rather large, flagellnm about the length of the peduncle, accessory 

 appendage 3 -articulate. Gnathopoda in female extremely small and feeble, 

 with the propodos scarcely larger than the carpus. Anterior pairs of perei- 

 opoda normally developed; the 3 posterior pairs moderately slender; basal 

 joint of antepenultimate pair rather broad and rounded at the infero-posteal 

 corner, that of last pair considerably expanded and of regular oval form. 

 Last pair of urcpoda considerably exceeding the urosome in length, inner 

 ramus small, outer very much elongated, with the terminal joint well de- 

 veloped, being about half the length of the proximal one. Telson rather nar- 

 row, each half having 1 lateral and 1 apical spine, cleft narrow. Length of 

 adult female 6 ram. 



$u3.-MaT. cip. S30. s 



