Boone, Crustacea, Cruise of "Alva," 1931 139 



long, subequal in length, armed with three to four acute, subequal 

 spines on the inferior lateral margin; dactyl short, 0.4 mm. long, 

 tip curved, inferior lateral margin sulcate, tip unispinose, acumi- 

 nate; upper lateral margin of meral, carpal, and propodal joints 

 beset with numerous long, solitary setae. 



The fourth pair of legs are similar to the third pair but when 

 fully extended reach only about midway the propodus of the third 

 pair of legs. 



The fifth pair of legs are of approximately the same relative 

 length to the fourth pair, as these bear to the third pair of legs 

 but are definitely slenderer; the propodus devoid of spines on 

 the inferior lateral margin and possessing a distinctive distal fan- 

 like "cuff" of setae which, on the inferior side, surround the dactyl 

 and are about twice as long. 



References: Alpheus obesomanus, Dana, J. D., U. S. Explor. 

 Exped., vol. XIII, pt. 1, 1852, p. 546; Atlas, 1855, pi. 34, figs. 

 7a-f .— MuLLER, F., Naturf . Gesell. Basel, vol. VIII, 1886-90, p. 

 471. — CouTiERE, H., Ann. Sci. Nat. Zool. et Paleontol., t. IX, 

 1899, p. 223.— BORRADAILE, L. A., in Willey's Zool. Results 

 in New Britain, New Guinea, Loyalty Islands and Elsewhere, 

 1895-97, pt. 4, 1900, p. 417.— Lenz, H., Zool. Jahrb. Syst., 

 vol. XIV, 1900-01, p. 430; also in Voeltzkow's Reise in Osta- 

 frika, 1903-05, Wiss. Ergebn. Syst. II, 1910, p. 568, Stutt- 

 gart. 



Crangon obesomanus, Edmondson, C. H., Bull. B. P. Bishop Mus., 

 vol. V, 1923, p. 28. 



Alpheus explorator, new species 



Plate 36 



Type : The type was dredged in 140 fathoms, in Flores Strait, 

 near Larantuka Village, Flores Island, Dutch East Indies, Octo- 

 ber 22, 1931, by the "Alva." 



Distribution: A deep sea species of Alpheus thus far re- 

 stricted to the type. 



Technical description: Rostrum triangulate, extending 

 about 1 millimeter beyond the carapace margin, dorsally cari- 

 nate, this carina extending posteriorly upon the carapace a little 

 more than half-way back, or to the obsolete cervical suture. Fronto- 



