152 . 



Stat. 125. July 18/19. Anchorage off Sawan, Siau-island. 31 m. Stone and some Lithothamnion. 



I young specimen. 

 Stat. 162. August 18. Between Loslos and Broken-islands, West-coast of Salawatti. 18 m. 



Coarse and fine sand with clay and shells, i specimen, probably female. 

 Stat. 258. December 12/16. Tual-anchorage, Kei-islands. 22 m. Lithothamnion, sand and coral. 



I specimen. 

 Stat. 273. December 23/26. Anchorage off Pulu Jedan, East coast of Aru-islands. (Pearl-banks). 



13 m. Sand and shells, i male and i ova-bearing female. 

 Stat. 315. February 17/18. Anchorage East of Sailus Besar, Paternoster-islands. Depth up to 



36 m. Coral and Lithothamnion. i specimen, without the legs of the first pair. 



A new species of the Diniorphus group, characterized, like Ath. jedanensis^ by the three 

 posterior legs being biu nguicula te; it differs from this species at once by the well-developed, 

 infra-corneal spine. 



Rostrum in the male from Stat. 273, which is considered as the type, triangular, 3,2- 

 times as long as wide at its base, acuminate, carinate and projecting straight forward to just 

 beyond the apex of median antennular article. Supra-corneal spines wanting. Looked 

 at from above, the extra-corneal spine almost reaches to the anterior margin of the eyes; in a 

 lateral view it appears a little shorter than the eyes and the well-developed, triangular and 

 acute, infra-corneal spine extends as far forward as the other. Along their posterior fourth 

 part the lateral margins of the rostrum run nearly parallel and they make distinct angles with 

 the orbital margins. 



Median antennular article slightly longer than thick, hardly one-third shorter than the 

 visible part of basal article ; third article hardly longer than the second. Stylocerite acuminate, 

 reaching to the apex of median article. 



The carpocerite extends a little beyond the median antennular article and is 3, 2 -times 

 as long as thick ; scale of scaphocerite decidedly longer than the antennular peduncle, terminal 

 spine just exceeding beyond it. 



Telson 4,2-times as long as the posterior margin is wide, outer angles not prominent; 

 longer inner spinules about as long as the posterior margin is wide, the short outer ones 

 extend beyond the end of the telson. Proportion between the width at the base and that of 

 the posterior margin 1,9 — 1,95. Spinules of the upper surface implanted near the lateral margins, 

 the anterior pair a little before the middle, the proportion between the length of the telson 

 and the distance of this pair from the posterior margin being 1,8 in the type, 1,75 in the 

 specimen from Stat. 162; the proportion between the distances of both pairs from the posterior 

 margin is 1,7 in both specimens. The spinules are of moderate length, those of the posterior 

 pair measure one-tenth the length of the telson. 



In the male from Stat. 273 the legs of the first pair are unequal. Measured along 

 its upper margin, the ischium of the left cheliped, which much resembles the larger one of the 

 male of Ath. Djiboutensis Cout. (H. Coltiere, Alpheidae Maid, and Laccad. Archip. p. 857, 

 Fig. 129^), appears one and a half as long as wide near the articulation of the merus ; the 

 upper margin is armed with five movable spinules, two at the distal extremity, the longer of 

 which is almost half as long as the upper margin, one at the proximal extremity, measuring 

 a little more than one-fifth the length of the upper margin and three of intermediate length 



