278 CEYLON PEARL OYSTER REPORT. 



but the hind margin is without spines or dentiform projections, except the large 

 flat '-tnjijied one (as in the last species) at the base of the dactylus; it is densely 

 clothed with long setae rising from numerous transverse ridges (fig. 37. gn. 2 ). In 

 the female the hand resembles E. rapax. 



The 3rd peraeopods are very short and stout, the hind margin of the front joint 

 almost straight, narrowing distally, and obscurely toothed. 



The 4th and 5th peraaopods are snbequal ; the 1st joint, which is rather wider and 

 more convex in the 5th, has the greater part of the hind margin elegantly cut into 

 flat-topped teeth of a peculiar form (fig. 37. pp. 4 )- 



The telson has the end of the divisions rather deeply notched, with the angles 

 equally produced ; 2 unequal spines and 2 spinules in each notch (tig. 37. t.). 



Parelasmopus, Stebbing, 1888. 

 Parelasmopus suluensis (Dana). Plate VI., figs. 38. 



Gammarus suluensis, Dana, 'U.S. Exploring Expedition,' 1852. 

 Megamaera suluensis, Sp. Bate, 'Cat. Amph. Crust. Brit. Mus.,' 1862. 



Cheval Paar, Gulf of Manaar. 



The palm of the 2nd gnathopod in the male is much less oblique than in the 

 " Challenger" figure.* In the female this limb resembles the 1st gnathopods, except 

 in being rather longer and more slender. The hand is considerably longer and narrower 

 than the wrist, with 5 fascicles of setae on each margin ; palm very oblique (fig. 38. gn.-). 



The 3rd uropods (wanting in the " Challenger " specimen) have the rami half as 

 long again as the peduncle, subequal in length and width, the outer slightly the 

 longer, with 4 spiniferous notches on the outer edge ; the inner has 4 pairs of sub- 

 marginal spines on the inner side (fig. 38. up. 3 ). 



The telson reaches to the end of the peduncle of the 3rd uropods. 



The length of a female (tube 94) is 13 millims. 



Cheirocratus, Norman, 1865. 

 A single female with ova from Periya Paar Kerrai, November, 1902; length 

 4 millims. There was only one postero- dorsal tooth on the urus and that on the 

 1st segment. A description without the male would be useless. 



Megaluropus, Norman, t 1889. 

 Megaluropus agilis, Norma n. 



Cheirocratus drechselii, Meinert, 'Crust. Malacostr. Danise,' 1890. 

 Megaluropus agilis, Norman, Della Valle, lor. ,il., p. 695, plates '. and 34. 



Kondatchi and < 'heval Paars, November, 1902. About 30 specimens. 

 Notwithstanding the following differences between the Ceylon and English speci- 



* In this respect our specimens resemble P. setiger, Chevreux ('Mem. de la Societe Zool. de France,' 

 t. xiv., p. 412, fig. 32, 1901), as also in some other small details. 



f ' Ann. and Mag. Nat. Hist.,' Ser. 6, vol. 3 (1889), p. 44(3, Plate XVIII., and vol. 4, p. 123. 



