BAHAMA CRUSTACEA. 247 



(d) I specimen. Under coral and in pools between tides, 

 Nassau, X. P., Jan., '90. 



{/) 2 broken. Near Nassau, N. P., Febr., '90. 

 The distribution of this species is circumtropical. 



57. Alpheus hippothoe, De Man. 



var. bahamensis, n. var. (PL xxx, Fig. 5). 



{a) 24 specimens. Under coral and in pools between tides, 

 New Providence. 



{b) 3 specimens, one with ova. Nassau, N. P., Jan., '90. 



(c) 2 specimens, one with ova. 



This species is most closely allied to the variety edainensis of 

 Alpheus hippotJioc De Man, from the Bay of Bengal and Indian 

 Archipelago (Arch, de Naturg., Bd. 53, p. 518, 1887). I am 

 indebted to Dr. Ortmann for a communication from Prof. De 

 Man comparing specimens from my material with his own hip- 

 pothoe. As there are certain differences between the West and 

 East Indian specimens I propose to make a new variety for the 

 West Indian. 



Total length from rostrum to telson, largest 24 mm., smallest 

 I 5 mm. Rostrum reaches nearly to end of first segment of in- 

 ner antenna, sharp, laterally compressed, prolonged backwards 

 as a distinct keel. Between keel and the prominent eyes a 

 rounded depression. No ocular spines. 



Inner antennae : First joint of peduncle with small spine on 

 outer surface ; second joint nearly twice the length of proximal ; 

 terminal joint one-half the length of second. Shorter flagellum 

 about the length of peduncle. Longer flagellum slender, about 

 thrice the length of shorter. 



Outer antennae : Peduncle a little longer than that of inner, 

 small spine on basal joint. Flagellum one third longer than 

 long ramus of inner antenna, spinose portion of scaphocerite a 

 little longer than the peduncle. Flabellar portion (scale) a 

 trifle shorter ; not quite so long as the peduncle. 



Third pair of maxillipedes do not reach beyond end of 

 peduncle of the outer antenna. 



First pair pereiopods : Large chela of largest specimen has a 



