148 



c^ Infra-corneal spine as long as the extra-corneal. Legs of the first 

 pair in the female subequal, resembling the small cheliped of 

 the male Sibogae de Man 



c„ Infra-corneal spine wanting. Legs of the first pair in the female 



equal, resembling those of Ath. Minikoensis jcdanensis de Man 



J I. At/ia7ias parvus de Man. 



J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XL 1910, 315. 



Stat. 2S5. January 18. 8° 39'.! S., i27°4'.4E. Anchorage South coast of Timor. 34 m. On the 

 limit between mud and coral, i egg-bearing female. 



This species that belongs to the Nitesccns group, is apparisntly closely related to Ath. 

 Granti Cent, from the South Adelaide coast, but it seems to differ by the different form of 

 the first pair of legs ; it is, however, to be regretted that so few characters of Ath. Granti 

 have been described. 



The rostrum of Ath. parvus is triangular, carinate, acuminate, just reaching beyond 

 the apex of the second antennular article and rejoining the orbital margin by a concave curve; 

 supra-corneal , spine wanting. Extra-corneal and infra-corneal spines well-developed, the extra- 

 corneal extending by half its length beyond the eye, the other is a little shorter. 



Median antennular article a little wider than long, half as long as the visible part of 

 basal article, third a little longer than the second; the stylocerite reaches to the apex of median 

 article. Carpocerite 3,5-times as long as thick, reaching to the apex of the second antennular 

 article, scaphocerite as in Ath. Naifaroc7isis. 



Telson 4,2-times as long as the posterior margin is wide, the latter as in Ath. Sibogae \ 

 proportion between the width at the base and that of the posterior margin 1,8. Anterior pair 

 of spinules of the upper surface just before the middle, the proportion between the length 

 of the telson and the distance of the anterior pair from the posterior margin being 1,95; 

 proportion between the distances of both pairs from the posterior margin 1,7. The spinules 

 of the upper surface measure one-tenth the length of the telson. 



Legs of the first pair equal, feeble. Ischium 3,4-times as long as wide, with a stiff seta at 

 the proximal end and another just before it. Merus 1,7-times as long as the ischium and 4,4-times 

 as long as wide in the middle, appearing here wider than at either extremity. The carpus, that 

 measures two-thirds the length of the merus, is 2,5-times as long as thick at the distal 

 end and the chela is hardly longer than the merus, the proportion being 1,08; measured in 

 the plane of the fingers, the chela appears 4,4-times as long as high and the fingers that shut 

 together and that are unarmed, are shorter than the palm, the fingers being in proportion to the 

 length of the chela as i : 2,6. In Ath. Naifaroensis, however, the chelipeds of which should agree 

 with those of Ath. Granti, the carpus appears, according to the figure (H. Coutiere, Alpheidae 

 Maid, and Laccad. Archip. 1905, Fig. 131c), only half as long as the merus and not yet one 

 and a half as long as thick, while the chela appears one and a half as long as the merus. 



Merus of second legs 6,5 to 7-times as long as wide in the middle. Carpus 1,4-times 



16 



