66 



the antennal scales, those of the 4 th are as long as the external maxillipeds, the 5 th pair, finally, 

 are nearly as long as the legs of the 2"' 1 pair. All the peraeopods show the same form and 

 characters as in other species of this genus, so e. g. the carpus of the legs of the i st pair, 

 which at the distal end of the upper inner surface appears emarginate, with an acute tooth at 

 the distal margin, and of the legs of the 3 ld and 4" 1 pair the ischium and the merus are armed 

 with long, movable spinules on their lower margin, like also on the merus of the 5 ,h pair. 



There are two stylets at the base of the endopod of the 2 nd pleopods. 



General distribution: The typical species has been taken off Tablas Island, one 

 of the Philippine Islands. * 



5. Acanthephyra curtirostris W.-Mas. PI. VI, Fig. 15 — 15/;. 



Acanthephyra curtirostris J. Wood-Mason, Annals Mag. Nat. Hist. Febr. 1891, p. 195 and 



May 1892, p. 364, 365, Fig. 5. 

 Acanthephyra curtirostris W '. Faxon, Memoirs Mus. Comp. Zool. XVIII, 1S95, p. 164, PI. XLIII, 



Fig. 2—5. 

 Acanthephyra curtirostris A. Alcock, Descr. Catal. Indian Deep-Sea Crust., 1901, p. 81. 

 Acanthephyra curtirostris Stanley W. Kemp, "Fisheries, Ireland, Sci. Invest., 1905, I., [1906], 



p. 22, 24". 

 Acanthephyra acutifrons C. Spence Bate, Challenger Crustacea Macrura, 1888, p. 749 (partim, 



teste Stanley W. Kemp, 1. c). 

 Illustrations of the Zoology of the Investigator, Crustacea, PI. III, Fig. 4. 



Stat. 48. April 13. 8°4'.7 S., Ii8°44'.3 E. Flores Sea. 2000 m. Bottom fine, grey mud, partially 



green. 1 young specimen. 

 Stat. 141. August 5. i°o'.4S., I27°25'.3E. 1950 m. Bottom very fine, hard sand. 1 very 



young specimen. 

 Stat. 185. Sept. 12. 3°2o'S., I27°22'.9E. Manipa-strait. From 1536 m. to surface. 1 adult 



male and 2 young specimens. 

 Stat. 2io a . Sept. 24. 5°26'S., i2i°i8'E. Entrance of Gulf of Boni. 1944 m. Bottom grey mud, 



upper layer more liquid and brovvn ; pumice stone. 1 adult male. 

 Stat. 217. Octob. 31. 6°4o'.6S., 123 14'. 7 E. 2477 m. Bottom solid grey and green mud, 



superficial layer more liquid and brown. 1 adult, ova-bearing female. 



The rostrum of the young specimen from Stat. 141, which is 25 or 26 mm. long, reaches 

 almost to the far end of i st antennular article and is armed above with 7 teeth. 



Of the adult male from Stat. 185 unfortunately the distal half of the rostrum is broken 

 off just above the spine on the lower margin. Measured along the upper border the 6 th somite 

 proves to be 11,5 mm. long, the 5 th 7,3 mm. and the telson 16 mm.; the telson, distinctly 

 longer than the outer uropod, is armed on each side with 9 or 10 spinules along the two 

 posterior thirds. The two young specimens are 30 mm. long. In both the upper margin of the 

 rostrum bears 7 teeth ; in one the rostrum reaches almost to the 3 vd antennular article and a 

 line uniting the apices of the rostral teeth curves regularly downward, while the unarmed 

 extremity projects horizontally forward ; the rostrum of the other reaches only the distal end of 

 the eyestalks, but its form is the same. In both individuals, like also in the young specimens 

 from the Stations 48 and 141, the slender tooth on the lower margin is placed higher, 

 nearer to the tip, than in the adult specimens. 



