2b SMITHSONIAN MISCe;i.LANEOUS COLLECTIONS 



longitudinal, minutely nodulose ridges on its upper surface ; between 

 them there is a small tooth or point projecting downward, formed 

 by the emargination. In our specimen the postorbital tooth seems 

 less strong than in Milne Edwards's figure (Hist. Nat. des Crust., 

 pi. xv^ figs. 15, 16), and there are no warts on the gastric region. 



Dredged from a weedy and sandy bottom in 2 fathoms, in a har- 

 bor of Ousima. 



Genus ACH^US Leach 



18. ACH^US JAPONICUS De Haan 



AclicEus japonicus De Haan, Fauna Japonica, Crust., p. 99, pi. xxix, fig. 

 3. Adams and White, Vo3^ Samarang, Crust., p. 5. 



In our specimens the spines of the ocular peduncles are obsolete,, 

 and the falciform dactyli of the posterior feet are much curved, form- 

 ing nearly a semicircle. 



Taken in the harbor of Hongkong, China. 



19. ACH-ffi:US LACERTOSUS Stimpson 



Plate III, Fig. 7 



Adieus lacertosiis Stimpson, Proc. Acad. Nat. Sci. Phila., ix, ?.. 218 

 [25], 1857. 



The following description is taken from an adult male : Carapax, 

 triangular; proportion of breadth to length, 1:1.8; regions suffi- 

 ciently prominent; surface smooth and slightly pubescent, without 

 spines. A small, flattened, wing-like projection at the hepatic 

 region. Rostrum as long as broad, with bilobate extremity ; its 

 upper surface two longitudinal convexities corresponding to the 

 deeply excavated fossse below. External antennje hair-like, longer 

 than the body. Peduncles of the eyes smooth. Chelopoda very 

 large, resembling considerably those of Myctiris; they are somewhat 

 longer than the body ; meros much swollen and larger than the hand, 

 with two granulated ridges below and one above, the latter bearing 

 also two small spines ; carpus with a small- tubercle or spine at the 

 summit near its articulation with the meros ; there are a few rather 

 long hairs at the inner angles of the carpus and meros ; hand some- 

 what curved, with the fingers small, slender, compressed, and curved, 

 touching each other throughout the length of their denticulated inner 

 edges. The chelopoda are separated below at their bases by a wide 

 depressed space. Ambulatory feet exceedingly slender ; those of the 

 first pair longest and nearly three times as long as the body. Feet 

 of the last two pairs with much-curved falciform dactyli ; the penult 



