88 SMITHSONIAN misce;li,ane:ous collections 



It differs from K. integer Dana (Xantho integer De Haan) in its 

 narrower carapax and more projecting- front; from K. riigulosa and 

 K. porcellana in the want of spines on the antero-lateral margin. 



Dredged in 20 fathoms, black sand, in Kagosima Bay, Japan ; also 

 in the northern China Sea, latitude 23°, from 24 fathoms, shelly 

 sand. 



Genus CHEIROGONUS Latreille 



135. CHEIROGONUS ACUTIDENS' Stimpson 



Platd XII, Fig. 3 



Cheirogonus acutidens Stimpson, Proc. Acad. Nat. Sci. Phila., x, p. 40 

 {2,7], 1858. 



Carapax rather narrow ; proportion of length to distance between 

 tips of lateral teeth, i : 1.26. Surface covered with setiferous tuber- 

 cles, mostly transverse, as in other species of the genus. Lateral 

 tooth slender, sharp, the principal or middle one very long, a small 

 intermediate tooth at the base of the principal one behind. Between 

 the teeth and sometimes on their edges there are a few small spini- 

 form denticles. Interantennal front or rostrum with a deep median 

 sinus and a smaller sinus or excavation at the tip of each fork, as in 

 C. hippocarcinoides. Antennae more than one-third as long as the 

 carapax. Feet all squamose ox scabrous and setose. Chelopoda 

 somewhat spinous above; hand costate externally, the costse sharply 

 tuberculated. 



Color in life light brick-red above; paler, inclining to yellowish, 

 below. Some specimens are of an orange color, but always dusky. 

 Pincers dark brown. Dimensions of a male : Length of carapax, 

 1.45; breadth between tips of lateral teeth, 1.83 inches. It grows to 

 a length of three inches, but the larger specimens, of which several 

 were collected, were accidentally lost. 



It may be distinguished from C. hippocarcinoides as found on the 

 west coast of America, as well as from Telmessus scrratns White, by 

 the greater length and acuteness of the lateral teeth, particularly the 

 larger one ; also by the existence of a small intermediate tooth be- 

 hind the large one. 



This crab is very common in the Bay of Hakodadi, in northern 

 Japan. It is commonly taken with the seine on sandy shores, but 

 often occurs on gravelly beaches above low-water mark. In June 

 the young, of half an inch to an inch in length, were much more 



' Tclmcsst{s acutidens (Stimpson). 



