84 CEYLON PEAEL OYSTER REPORT. 



segment of antennular peduncle. Antennular scale reaching past the middle of the 

 2nd peduncular joint. The antennal peduncle is longer than the antennular peduncle. 

 The antennal scale is as long as the antennular peduncle. 

 General distribution : Australia, Maldives, Ceylon, Pacific. 



Synalpheus neomeris, de Man. 



Synalpheus neomeris, de Man, ' Zool. Jahr.,' 9. Bd., p. 734, 1897. 

 Locality: Gulf of Manaar (Station III.), 1 specimen. 



I have referred the single specimen to the above species. It appears to differ but 

 slightly from Synalpheus gravieri. 



General distribution : Red Sea, Bay of Bengal, Madagascar, Australia, Japan, 

 Maldives, Pacific, Ceylon. 



Alpheus, Fabricius, 1778. 



Alpheus idiocheles, Coutiere. 



Alpheus idiocheles, H. Coutiere, 'Fauna of Maid, and Lace.,' p. 883, 1905. 



Locality : Muttuvaratu Paar (Station VI.), 3 specimens. 



Carapace deep. Rostrum short, and separated from the orbits by deep grooves. 

 The orbits are well formed and unarmed. In the antennule the 1st and 3rd segments 

 of the peduncle are subequal, each being half as long as the 2nd segment. The 

 antennular scale reaches to the middle of the 1st peduncular segment. The antenna 

 is short, only reaching three-fourths of the way along the 2nd joint of the antennular 

 peduncle. The antennal scale is nearly as long as the antennal peduncle. The large 

 chela is peculiar, having the dactylos portion of the digit hammer-shaped, and the 

 propodite part short as in Alpheus malleodigitatus. The 3rd and 4th legs are robust 

 and have the propodite armed with 5 spines, and end in a simple dactylopodite. 



General distribution : Maldives, Ceylon. 



Alpheus phrygianus, Coutiere. 



Alpheus phrygianus, Coutiere, 'Fauna of Maid, and Lace.,' p. 886, 1905. 



Localities: Gulf of Manaar (Station III.), 2 specimens; Cheval Paar (Station 

 XLVIII.), 2 specimens. 



Somewhat similar to A. idiocheles. The eyes are not so prominent. The antennae 

 are comparatively longer, reaching to the end of the 2nd segment of the antennular 

 peduncle. The antennal scale reaches to the middle of the 2nd segment of the 

 antennular peduncle. The digits of the large chela are similar in shape to the 

 preceding species, but the palm is broader. 



General distribution : Maldives, Ceylon. 



Alpheus paraculeipes, Coutiere. 



Alpheus paraculeipes, Coutiere, 'Fauna of Maid, and Lace.,' p. 894, 1905. 

 Locality : Cheval Paar (Station XLVIII.), 1 specimen. 



