MACRURA. 87 



This specimen appears to differ mainly from the variety malensis in the form of the 

 rostrum, which is much narrower in proportion to its length. 

 General distribution : Maldives and Ceylon. 



Alpheus audouini, Coutiere. 



Alpheus edwardsi, Audouin (see Coutiere, 'Fauna of Maid, and Lace.,' p. 911). 

 Alpheus audouini, Coutiere, 'Fauna of Maid, and Lace.,' p. 911, 1905. 



Localities: Off Mutwal Island (Station LXVIL), 2 specimens; Pearl banks, Gult 

 of Manaar (Station III.), 6 specimens ; Coral reef, Manaar (Station LIV.), 3 specimens. 



This species, which Coutiere has separated from Alpheus edwardsi, resembles the 

 latter species in the form of the rostrum and in the appearance of the antennae. The 

 large chela has the dorsal and ventral projections of the palm rounded, thus differing 

 from those of A. edwardsi, which are spiny. 



General distribution : Red Sea, Indian Ocean, Malay Archipelago, New Zealand, 

 Sandwich Islands. 



Alpheus macrodactylus, Ortmann. 



Alpheus macrodactylus, Orthann, ' Zool. Jahrb.,' V., p. 473, 1890. 



Locality : Off Mutwal Island (Station LXVIL), 1 specimen. Related to 

 A. edwardsi and A. euphrosyne. 



The rostrum is well pronounced and more than half as long as the 1st segment of 

 the antennular peduncle. Of the joints of the antennular peduncle the 2nd is the 

 longest, being twice as long as the 3rd and nearly twice as long as the 1st. The 

 antennular scale is broad and reaches nearly to the end of the 1st segment of the 

 peduncle. The antennal peduncle and scale are equal in length and extend as far 

 forward as the end of the antennular peduncle. The large chela differs from that of 

 A. edwardsi in the absence of a dorsal spine and in the comparatively greater length 

 of the digits. 



General distribution : Australia, Ceylon. 



Alpheus laevis, Randall. 



Alpheus laevis, Randall, ' Journ. Acad. Nat. Sci. Phil.,' vol. viii., p. 141. 



Localities: Galle (Station XXXV.), 4 specimens; Coral reef near Galle (Station XL), 

 5 specimens. 



Well-developed rostrum reaching to the end of the 1st segment of the antennular 

 peduncle. Orbits armed with two small spines. Segments of the antennular peduncle 

 subequal. Antennular scale slightly longer than the 1st peduncular segment. 

 Antennal peduncle and scale equal to one another and slightly longer than the 

 antennular peduncle. The large chela has a massive palm, laterally compressed, with 

 no dorsal or ventral notches. The carapace is deep. 



General distribution : Indian Ocean, Pacific, Australia. 



