68 Bulletin, Vanderhilt Marine Museum, Vol. II 



Bijdragen tot de Dierkunde, Natura Artis Magistra Aflev. 23, 

 p. 18, 1924. 



Stenorynchus seticornis Rathbun, Bull. 129, U. S. Nat. Mus., p. 13, 

 pis. 2 and 3, 1925. 



Stenorhynchus longirostris (Fabricius). 



Plate 17. 



Type : Fabricius ' type came from the Mediterranean Sea. 



Distribution: Known from the Gulf of Gaseogne, the Canaries 

 and Cape Verde Islands and from the Mediterranean Sea. 



Material examined : One specimen taken in dredge in the Adriatic 

 Sea, by the "Ara." 



Technical description: Female — Carapace narrowly triangular, 

 widest posteriorly; rostrum only two-thirds as long as the carapace, 

 composed of two slender horns so closely applied to each other that 

 they appear as one horn with a median groove, until placed under the 

 microscope. The rostrum is distinctly upcurved and is furnished with 

 many little hooked setae. The antennae lay one on either side of the ros- 

 trum ; the basal article is short, armed on its inferior distal extremity 

 with a spine; the second article is a trifle longer and slenderer than 

 the first and is similarly armed with a spine ; the third article is four 

 times as long as the second, or about one-half as long as the rostrum ; 

 the flagellum is a third longer than the last peduncular article and is 

 coarsely multiarticulate, extending one-third of its length beyond the 

 rostrum. The superior orbital margin forms a rim around the eye, 

 which latter is protruded on a long stalk and has an elliptical, oval 

 cornea. The gastric region is well separated from the cardiac by a 

 transverse depression which also crosses the branchial region. There 

 is a single very sharp, up-pointing spine on the summit of the gastric 

 region in the median line and posterior to it on the summit of the car- 

 dio-intestinal region is a similar long spine; there is a small, acute, 

 out-pointing spine on the hepatic region and posterior to this three 

 others along the lateral branchial margin. Anterior to and outside 

 of the large gastric spine there are a pair of sharp, upward directed 

 spines, one on each side; still farther outside and in line with the 

 largest spine are another pair of short, sharp spines on the gastric 

 region. Three short, sharp spines define a triangle on the postero- 



