76 CARCINOLOGICAL STUDIES. 



1 8 . Ma er o pht hal mus crassipes H. Milne Edw. 

 (PI. 4, fig. 7—9). 



Macrophthahnus crassipes, H. Milne Edwards, in : Annales Sciences 

 Naturelles, T. XVIII, 4852, p. 157. 



One male specimen from the Carolines. 



I will remark the following about this rare form , which 

 is only known by the short diagnosis of Milne Edwards. 

 I have before me a type specimen (cf) of Macr. crassipes 

 M. Edw., received from the Paris Museum , a type specimen 

 (cf) of Macr. dilatatus de Haan from Japan, and several 

 specimens (rf and 9) of Macr. carinimanus Latr., on which 

 I have published some remarks ten years ago (Notes from 

 the Leyden Museum, Vol. II, 1880, p, 69). In that note 

 I have compared Macr. carinimanus Latr. with Macr. dila- 

 tatus de Haan and I now wish to indicate the differences 

 between these two forms and Macr. crassipes. 



The cephalothorax of Macr. crassipes most closely 

 resembles that of Macr. dilatatus , as regards its general 

 form, the granulation of the upper surface, and the num- 

 ber, form and direction of the antero-lateral teeth. I cannot , 

 indeed , find any other difference than that the fissure between 

 the external orbital angle or first antero-lateral tooth and 

 the second tooth is a little narrower in Macr. crassipes. 



The eye-peduncles of Macr. crassipes reach as far as 

 the external orbital angle , but are a little shorter in the 

 species of de Haan and do not reach the extremity of the 

 first antero-lateral tooth. The interregional grooves are 

 equally developed in both species , and the granulation 

 of the upper surface is also quite the same , two granular 

 tubercles being observed on the postero-lateral sides. 



Both species fully agree with one another 

 as regards the direction of the upper margin 

 of the orbits, which is somewhat oblique, so 

 that the extremity of the external orbital 

 angle projects much less forward than the 

 upper orbital margin. 



Notes from tlie Xjeydeu Museum, Vol. XII. 



