20 SMITHSONIAN MISCELLANEOUS 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 



Achcciis japonicHS De Haan, Fauna Japonica. Crust., p. 99, pi. xxix, fig. 

 3. Adams and White, Voy. 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-ffiUS LACERTOSUS Stimpson 



Plate III, Fig. 7 



Adieus lacertosus Stimpson, Proc. Acad. Nat. Sci. Phila., ix, r. 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 fossae below. External antennae 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 



