654 MISS M. J. RATHBUN ON CRUSTACEA 
Monte Bello Islands ; special locality not given: 19. 
In the main, this specimen agrees with Alcock’s description 
and figures. There are 17 ridges in the stridulating organ near 
he posterior corners of the carapace. The telson and the 
helyeum differ from typical stridulans. The telson has 5 (not 4) 
pairs of marginal spines, 4 pairs of which are movable, and the 
posterior pair immovable. The thelycum has the plate between 
the legs of the fifth pair similar to that in fig. 14d, loc. eit.; the 
plate between the legs of the fourth pair is trilobate or in the 
shape of a clover-leaf; the bar between those two plates is longer 
(from front to back) and narrower than the same plate in 
Alcock’s figure. 
On p..50 of his Catalogue (op. cit.), Dr. Alcock suggests the 
identity of my akayebi with stridulans. M. akayebi, however, is 
quite distinct ; the body and rostrum are more slender, the teeth 
on the latter more prominent; the antennal, hepatic and branchi- 
ostegal spines are larger; the second and third segments of the 
antennular peduncle are longer and more slender; subterminal 
prominence on carina of fifth abdominal segment obtusangular, 
not dentiform; sixth segment longer and narrower than in 
stridulans. The thelyecum is similar to that of the female from 
the Monte Bello Islands. 
Family CRANGONID& (=Alpheide), 
CRANGON EDWARDsII (Audouin). 
Alpheus edwardsii de Man, Jour. Linn. Soe. London, Zool., 
vol. xxii. 1888, p. 266, and synonymy. 
Home Lagoon, Hermite; Aug. 12, 1912; No. 140: 1 9 ovig., 
51 mm. long. 
Monte Bello Islands; special locality not given ; 2 specimens; 
the larger one lacks both pairs of chelipeds, the smaller one lacks 
the larger cheliped of the first pair. 
The two specimens possessing chelipeds of the second pair 
belong to the variety in which the first and second joints of the 
carpus are of the same length. The larger of these specimens 
shows a faint notch in the upper margin of the smaller manus of 
the first pair. 
CRANGON BUCEPHALUS (Coutiere), var. 
Alpheus bucephalus Coutiere, Alpheide in Gardiner’s Mald. & 
Laccad. Archip., 1905, p. 890, pl. Ixxviii. figs. 29-297; De Man, 
Alpheide ‘ Siboga,’ 1911, p. 316. 
Dredged off Hermite; sandy bottom; July 9-12, 1912; No. 
109: 13, about 12°5 mm. long. 
The differences between our specimen and the type are so few 
that the former probably represents no more than a variety of 
the latter. The specimen in hand is considerably larger than the 
