76 CEYLON PEARL OYSTER REPORT. 



Leucifer, Milne-Edw., 1837 

 (= Lucifer, Vaughan Thompson, 1829). 



Leucifer typus (Vaughan Thompson). 



Lucifer typus, Vaughan Thompson, 'Zool. Researches,' p. 58, 1829. 

 Leucifer typus, Milne-Edw., ' Hist. Nat. Crust.,' t. ii., p. 469, 1837. 



Localities: Muttuvaratu Paar (Station VI.); Palk Strait (Station XVIII.) ; 

 Galle Harbour (Station XXXVI.) ; south of Cheval (Station XLVIL); Cheval Paar 

 (Station XLIX.) ; Periya Paar (Station LXL). A large number of specimens from 

 the various localities. It is probable that most of these specimens were taken in the 

 tow-net, although the labels do not definitely say so, except in one instance. 



Altogether there are some hundreds of specimens, and I am satisfied that they all 

 belong to this species. It is worthy of note that in the separate gatherings the 

 specimens are almost entirely of one sex. 



The differences from Spence Bate's description are very slight. In the male the 

 eyes do not quite reach to the end of the 1st segment of the antennular peduncle. 

 Bate describes them as reaching nearly to the end of the 2nd segment. 



The antennal scale is shorter than the 1st segment of the antennular peduncle and 

 about equal in length to the eye. In the females the eyes are slightly shorter than 

 in the male, and in the females the spines at the base of the abdominal appendages 

 are not so well developed as in Sp. Bate's figures. 



General distribution : North and South Atlantic, Pacific, Australia, Ceylon. 



Tribe: CAKIDEA 



Family: ATYID.E. 



Caradina, Milne-Edw., 1837. 



Caradina vitiensis, Borradaile Plate I., fig. 4. 



Caradina vitiensis, Borradaile, 'P.Z.S.,' 1898, p. 1003. 

 Locality : Galle (Station XXXVL), 5 specimens, average length 13 millims. 

 These specimens appear to agree closely with Borradaile's description, but the 



i g 20 



rostrum is not quite so richly toothed, having a formula - . The ventral rostral 



teeth are smaller than the dorsal ones. The anterior border of the eyes appears to 

 be slightly concave in all the specimens. The chelas of the first two pairs of 

 thoracic legs are typical of the genus. The distal joint of the last thoracic legs has 

 a large number of closely packed spines on its posterior border. The sixth abdominal 

 segment is almost twice as long as the fifth, and the telson is equal in length to the 

 sixth segment. The telson bears five pairs of small spines on its dorsal side. Each 

 corner of the posterior border bears a small spine, and there are four pairs of longer 

 spines arranged along the posterior border. 



