24 UARCINOLOGICAL STUDIES. 



less rounded and agrees with the quoted figure of Milne 

 Edwards; the distal tooth is also comparatively smaller, 

 especially in the adult male from Fiji. In the latter the 

 dactylus is also comparatively higher than in the other 

 specimens, so that the fingers leave a small hiatus between 

 them when closed , and the dactylus presents no trace of 

 the small distal tooth which exists in the other specimens. 

 These individuals from the Fiji and Samoa Islands are 

 probably to be referred to the variety cultrimanus Ad. & 

 White , though , according to Miers , in the type-specimens 

 of that form the proximal tooth of the two large triangular 

 teeth of the index is always entirely wanting, whereas a 

 trace of it still exists in our specimens. I have figured the 

 hand of the larger male from Samoa (fig. 5^). 



The larger hand of one of the Atjeh males has a length of 

 31^)2 mm. and is 14 mm. high ; these numbers are for the adult 

 male from Fiji 4272 I'Qi^- ^^^ 1*^^/3 nim. , and for the 

 larger male from Samoa 33 mm. and 13 mm. 



9. Gelasimus tetragon on Herbst. 

 (PI. 2, fig. 6). 



Gelasimus tetragonon, Herbst; Milne Edwards, I.e. p. 147, PI. Ill, 

 flg_ 9. — Kingsley, in: Proc. Acad. Nat. Sciences of Philadelphia, 

 1880, p. 143, PI. IX, fig. 11. 



Gelasimus variatus, Hess, Beitrage z. Kenntniss der Decapodenkrebse 

 Ost-Australiens, 1865, p. 20, PI. VI, fig. 7. 



An adult male and two very young males from Tahiti, 

 and a fine male and a female without eggs from the 

 Samoa Islands. 



The nearest ally of this species is Gelos. voeans M. E. 

 The cephalothorax of GeJas. tetragonon is, however, strongly 

 convex in the antero-posterior direction, much more 

 than that of Gelas. voeans, the orbits have a much 

 more oblique direction and the front and the 

 frontal furrow are comparatively broader. The 

 lateral margins of the cephalothorax are indicated in both 



Notes frona the Leyden Museum, Vol. XUl. 



