l80 SMITHSONIAN MISCELLANEOUS COLLECTIONS 



Taken from a shelly bottom in twenty fathoms, in Kagosima Bay, 

 Japan. 



Genus CONCHCECETES Stimpson 



This genus is founded upon the old Cancer artificiosus of Herbst, 

 which, like Guerin's Hypoconcha, uses a valve of the shell of some 

 acephalous mollusk for its transportable covering and hiding place. 

 Its posterior feet present, therefore, modifications specially adapted 

 for securing this kind of habitaculum. 



The carapax is depressed, subpentagonal in shape, and nearly 

 naked. The dorsal sulci are conspicuous. Besides the usual sulci 

 arising from postero-lateral notches, there is another, of considerable 

 depth, extending from the antero-lateral corner of the carapax to 

 the transverse gastro-cardiac suture. The front is rather narrow. 

 The palate is armed with ridges. The feet of the fourth pair are 

 robust, thicker than those of the second and third pairs, and nearly 

 as long; the dactylus is large and hook-shaped, recurving upon an 

 obtuse process of the penult joint at its base. The feet of the fifth 

 or last pair are very slender, and their extremities are not subcheli- 

 form, having only a minute, somewhat twisted dactylus. Our only 

 female specimen is immature, but the sternal sulci seem to be like 

 those of Dromia proper. The male abdomen is of moderate breadth, 

 with the fifth and sixth joints apparently soldered together, although 

 the commissure is distinct; appendages to penult joint rounded.; 

 terminal joint subcordate, as broad as long. 



The only species known is an inhabitant of the East Indian seas. 



286. CONCHCECETES ARTIFICIOSUS (Herbst) Stimpson 



Pi,ATE XXI, Fig. 5 



Cancer artificiosiis Herbst, Naturg. d. Krabben und Krebse, in, 54, pi. 



LVIII, fig. 5. 

 Conchcecctes artiUciosus Stimpson, Proc. Acad. Nat.'Sci. Phila., x, p. 240 



[78], 1858. 



About one inch in length, of a light buff color above, with a little 

 pale red on the posterior part of the carapax ; beneath darker ; fingers 

 and dactyli of the feet reddish-white. Surface minutely pubescent. 

 It is found in valves of Cytherea, etc. 



Taken sparingly in eight and ten fathoms on the shelly bottom of 

 the channel between Hongkong Island and the Chinese main. 



