Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 185 



Distribution: Subarctic, usually in depths ranging from 200 to 

 500 fathoms and down to 672 fathoms; more rarely found from 30 

 to 60 fathoms. Found on the European coast in the westerly part of 

 the Murman Sea, the Scandinavian coast, the Bay of Gascony in 425 

 to 638 fathoms; off Iceland, in the Davis Straits, and on the Ameri- 

 can coast as far southward as Cape Cod, Mass., in 94 to 524 fms. 



Material examined: One specimen dredged in 200 fms., 9 miles 

 S. W. by W. of Port Basque, Newfoundland, by the "Ara," William 

 K. Vanderbilt, commanding. 



Technical description : Carapace 13 mm. long, including the ros- 

 trum; abdomen 40 mm. long. Rostrum small, flat, tongue-like, above 

 and extending as far forward as the eye, with triangulate tip and one 

 small tooth on each side at the base. Carapace with a median dorsal 

 carina composed of three, acute, subequally spaced teeth, each of 

 which is continued posteriorly for a short distance as a carina. There 

 is a short, triangulate, orbital spine and behind it, in line with the 

 first median dorsal gastric spine, is another spine which is continued 

 posteriorly as a carina, and behind this, approximately in line with the 

 second median spine is another similar spine. The hepatic spine is 

 in line with the first dorsal and first lateral spine and has a slight 

 carina posteriorly. There is a sharp antennal spine in advance of and 

 slightly below the hepatic spine. The abdomen tapers posteriorly, the 

 first to fifth segments, inclusive, have the epimeral margin scarcely at 

 all produced and broadly rounded. The sixth segment is about one 

 and one-half times as long as the fifth, with paired, submedian longi- 

 tudinal carinae, slightly below each of which the posterior margin is 

 produced into a triangulate tooth which projects over the telson. The 

 telson is a little longer than the sixth segment, narrowed to a triangu- 

 lar point; there are three pairs of spines along the proximal half of 

 the lateral margin and a pair of larger subdistal spines, one on each 

 side of the apical tooth. The caudal fan has a short base and a long, 

 slender, narrowly tapering inner blade with the distal margin rounded 

 and a much wider and shorter outer blade, which has the outer lateral 

 margin thickened and terminating in a subdistal tooth, with the distal 

 margin widely, shallowly rounded ; both blades have the margin crenu- 

 lated and ciliated. 



The eye is set on a short stalk with a calcareous projection on the 

 dorsal surface ; the cornea is spherical, terminal. 



The antennulae have the basal joint excavate beneath the eye, with 

 the outer lateral margin lobate-acuminate and separated from the dis- 



