CARCINOLOGICAL STUDIES. 53 



Dimensions of the male from Tjibodas : 



cf 



Distance between the external orbital angles 18^/^ mm. 



Greatest width of the cephalothorax .... 22V3 » 

 Breadth of the upper margin of the front . 8V4 » 



Length of the cephalothorax 21^/2 » 



Sesarma oceanica de Man has been found on the Is- 

 lands of Ponape and of Java. 



27. Heterograpsus crenulatus Guerin. 



Heterograpsus crenulatus^ Guerin; H. Milne Edwarris, in: Anna- 

 les des Sciences Naturelles, T. XX, 1853, p. 193. 



A male from New Zealand was presented in 1878 by 

 Milne Edwards to the Leyden Museum under the name 

 of Heterograpsus harhimanus Heller. As Miers and Filhol 

 have, however, pointed out, this species is identical with 

 Heterogr. crenulatus Guerin. 



Heterogr. crenulatus is closely allied to Heterogr. peni- 

 cillatus de Haan (confer de Man, in: Notes from the 

 Leyden Museum, T. I, p. 71). The differences are the 

 following : The cephalothorax of the Japanese species is 

 broader anteriorly , the distance between the external 

 orbital angles being greater in proportion to the length 

 of the cephalothorax than in Heterogr. crenulatus. The 

 front o{ Heterogr. penicillatus 'is exactly half as broad 

 as the greatest width of the cephalothorax and compara- 

 tively broader than in the other species. The upper sur- 

 face of the cephalothorax of Heterogr. penicillatus is near- 

 ly smooth and only minutely punctate, showing only a 

 few granules on the postfrontal lobes, on the protogastric 

 regions on each side of the shallow bifurcated frontal fur- 

 row, and a few also on the antero-lateral parts of the 

 upper surface. This fine granulation is much more dis- 

 tinct in Heterogr. crenulatus , in which the greatest part 

 of the upper surface is covered with granules, the cardiac 

 region only being smooth. 



Notes from the Leyden ÜMuseum, Vol. XIII. 



