ACANTHOCHITES. 21 



The figures of Reeve indicate that this is a form in which the 

 girdle encroaches much at the sutures, and the valves are coarsely 

 granulated, somewhat as in A.rliodeus. Mr. E. A. Smith's inability 

 to separate it from the minutely granulated A. diserej)cms is there- 

 fore not easy to understand. 



A. ARMATUS Pease. 



Shell ovate, slightly oblong, elevated-convex. Greenish irre- 

 gularly maculated with black, pale in the middle, with two longitiu 

 dinal black lines. Lateral areas granulose, central longitudinally 

 striated, not beaked. Girdle leathery, narrow, with shining white 

 spicules, and having tufts of silvery-white, glassy spicules. 



Length 10, breadth 6 mill. (Pse.) 



Oahn, Sandwich Is. 



(f) Acanthochites armatus Pse., Amer. Journ. of Couch, vii, p. 195 

 (1871.) — Aconthochites baiicns Cpk. MS. 



A single specimen of this species before me is too much eroded for 

 illustration. The species is quite similar to Gould's A. achates in 

 general aspect. 



A. viRiDis Pease. 



Shell oblong ovate, but slightly elevated, green with a pale or 

 whitish line down the middle. The valves are semi-lunar in shape, 

 the posterior side being straightly transverse or nearly so. They are 

 without a ridge or umbonal elevation in the centre, where they are 

 smooth ; the sides minutely granulose. The valves of insertion are 

 entire plates on which the dorsal valves are set or imbedded. They 

 extend from the sides of the dorsal valves, and produced anteriorly, 

 the edges being smooth and rounded at their termination. On the 

 posterior terminal valve, they are produced laterally, and are trun- 

 cate at their termination. On the anterior terminal valve, they are 

 produced at an equal distance around the front and sides. They 

 are smooth and of a light bluish color. The ligamental border is 

 covered with close-set short spiculne. The spiculte of the tufts are 

 dense, vitreous and dark green. (^Pse.) 



Length 40, breadth 14 mill. 



Kauai, Sandwich Is. (Pse.) 



(.^) Acanthochites viridis Pse., Amer. Journ. Conch, vii, p. 194 



(1871.) 



