's RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 171 



orbital angle and the first lateral tooth are somewhat differently shaped 

 and the transverse furrows on the lateral regions of the carapace are 

 much more pronounced than in the Japanese species. 



The external orbital angle is directed obliquely forward and may 

 project as far as the upper orbital margin; in some cases however the 

 direction is less oblique and the tip remains a little way behind the level 

 of the upper orbital margin (see de Man 1902). The first lateral tooth 

 is of nearly the same size (in the original Cancer brevis it appears to 

 be slightly larger), the incision between the teeth is sometimes triangular 

 and wide, in other cases very narrow and de Man (1880 p. 76) has 

 described a specimen, in which the teeth are placed closely together and 

 only separated at the tip. Behind the second lateral tooth there is a row 

 of indentations at the lateral borders of the carapace, varying both in 

 number and in size (see de Man 1902). 



The chelipeds of the male, remarkable for their elongated palm, the 

 length of which is not less than four times its height, have been made 

 so well-known by de Man (1880 and 1890) that it is needless to rede- 

 scribe them. The drawing, made by Prof. Vanhöffen, of the cheliped of 

 Cancer brevis agrees exactly with de Man's figure (1890). The outer 

 surface is nearly smooth, somewhat granulated at the upper border *), a 

 strong ridge runs at the under margin, parallel with it, and is continued 

 on the immobile finger; the inner surface of palm and fingers are much 

 hairy and there is a distinct spine not far from the carpal end on 

 the palm. 



The Museum contains six specimens (4 cT, 2 Q) of this species, collected 

 at the coasts of Celebes, and already spoken of by de Man (1880). These 

 specimens seem first to have been preserved in a dry state and afterwards 

 put in alcohol, as may be inferred from the extreme liability of the legs 

 to detach themselves; it is for this reason that I have abstained from 

 measuring the chelipeds. 



Dimensions of some specimens 12 3 4 5 



^^99^ 



Distance between external orbital angles 21.75 21.5 21.— .17.25 21.65 

 Length of carapace 9.75 9.5 9.5 8.25 9.75 



1 — 4 are Museum specimens, 5 is the <ƒ from Halmaheira (de Man, 

 1902, p. 493). 



1) From the few notes provided by Hilgendorf about the original specimen of Herbst's 

 Cancer brevis (Mouatsber. Ak. Wiss. Berlin, 1878, p. 807) we may infer already with confidence, 

 that this specimen really does belong to M. carinimanus, as it is described as having a long 

 palm, scarcely increasing in height towards the end, and without a granulated ridge along the 

 upper border, as in the next species, which is founded on Hilgendorf 's specimen. 



