MACRUBA. 83 



Synalpheus biunguiculatus, Stimpson. 



Synalpheus biunguiculatus, Stimpsox, ' Proc. Acad. Phil.,' p. 31, 1860. 

 Localities : Deep water off Galle (Station XL.), 2 specimens ; Coral reef, Gulf of 

 Manaar (Station LIV.), 14 specimens; Chilaw Paar (Station LXIX.), 1 specimen. 



Tin's species differs principally from the preceding species in (1) the rostrum and 

 orbital spines being shorter in comparison with the 1st joint of the antennular 

 peduncle ; (2) the antennal scale is shorter, and only reaches to the end of the 

 antennular peduncle ; (3) the posterior border of the telson has a deeper curve. 

 General distribution : Maldives, Philippines, Pacific, Ceylon. 



Synalpheus carinatus, de Man Plate II., fig. 9. 



Synalpheus carinatus, de Man, ' Arch. f. Naturg.,' I., 1887. 

 Synalpheus carinatus, Coutiere, ' Ann. des Sci. Nat.,' (8), t. ix., 1899. 



Locality : Deep water off Galle (Station XLL), 2 specimens. 



The rostral spine is more than twice the length of the orbital spines and reaches 

 nearly to the end of the 1st segment of the antennular peduncle. The rostrum and 

 the orbital spines point slightly upwards. The 1st segment of the antennular 

 peduncle is slightly longer than the 2nd and twice as long as the 3rd. The 

 antennular spine reaches to the end of the 1st peduncular segment. The antennal 

 peduncle is slightly longer than the antennular peduncle. The antennal scale reaches 

 to the end of the antennular peduncle. The large chela is on the left side. The 

 carpopodite has a strong ventral spine. The dorsal side of the palm ends in a fairly 

 prominent spine, immediately in front of the digits. This spine seems more strongly 

 developed than in the type species. 



In the 3rd pair of legs there is a spine on the ischiopodite, the meros is almost as 

 long as the carpos and propodite combined, and bears 8 well-developed spines on the 

 posterior border. The carpos bears a single spine at the distal end of its posterior 

 border. The propodite has 8 spines on the posterior border. The dactylos is bifid. 



In the male each of the abdominal pleura is produced posteriorly into a spine. In 

 the female the pleura are rounded. The telson is as long as the uropods and tapers 

 slightly. It carries two pairs of spines on the dorsal side and there are 3 spines at 

 each of the posterior corners. 



General distribution : Indian Ocean. 



Synalpheus comatulorum, Haswell. 



Synalpheus comatulorum, Haswell, ' Cat. Austr. Crust.,' p. 187, 1882. 

 Synalpheus falcatus, Sp. Bate, ' " Challenger" Macrura,' p. 574, 1888. 



Localities: Navakaddua Paar (Station LXVIIL), 4 specimens; Gulf of Manaar 

 (Station LIV.), 3 specimens; Chilaw Paar (Station LXIX.), 1 specimen "on 

 Antedon" ; south end of Cheval Paar (Station XL VIII.), 1 specimen. 



Rostrum twice as long as the orbital spines, and reaching to end ol the 2nd 



M 2 



