J4 LOAN I I i<>< HITES. 



plat\ Posterior valve havini: the tegmentuin very small, 



in front, tn,,'j> ,- tlmn '!<l,\ nnicro situated at the posterior 

 third. 



Interior blue, darker along the cavity ; sinus narrow, deep, sub- 

 angular. Sutnral lamina- very large. Posterior valve biangular 

 behind, strongly C 1 on the latero-posterior sides. 



Girdle very wide, covering all but a narrow shield of each valve; 

 covered with a close, short velvety pile which has a longer fringe 

 around each valve ; hearing 18 unusually large, dense tufts of execs- 

 finespicul *, </./<///// 5-7 mill. long. 

 :i), breadth 15-18 mill. 



Paz, Lower C" //';'"/// m (W. N. Lockington.) 



Thi- is one of the largest as well as the most beautiful species of 



the genus. The valves are more covered than in any other known 



form, and the hunches of shining bristles are larger. A large 



number of individuals preserved in alcohol and dry were presented to 



Lcademj by Mr. W. N. Lockington, (no. 60107.) 

 One specimen before me has the girdle pubescence of a pale buff 

 tint, and the tufts are silvery, a trifle bronzed. 



Var. L1CPULLACKU8 Pilsbry, IM. 4, fig. 85. 



- mlar to the preceding, but exposed portion (tegmentum) of 

 -mediate valves much broader behind, tla.-k-shaped ; the lateral 

 borders ngmoid. Tegim-ntum of anterior valve also larger. 



A. AVI. n.A Carpenter. 



Shell very similar to .-1. nrnnjnu'^i > in form, si/.c, girdle and 



general habit; but the sculpture and terminal lamina- are difleivnt. 



Dorsal ridge having about 6 longitudinal grooves, the intervals 



1; umbonrs wide ; diagonal areas hardly 



defiii ..mam. utcd with oval, flattened scales, large for the 



size of the shell, and in indistinct diveririni: series. Mm-ro small, 

 situated in front. ( olor livid and olivaceous-brown variou.-ly 

 stained. Plates of insertion at sides as in A. nrragonites; anterior 

 plate with ."> slits. 



_-th I, breadth LM mill. (Cpr.) 



Catalina Island, 10-20 fma.; rare (al. .State Coll., no. K'TL'. 

 Cooper.) 



' " 7 '' < 'ri i < ;ii. A.oad Nat. Sc-i. iii, p. 'Jl 1 



, 1866.) 



Lik.- .1. nrragoniUs, but valves sculptured in large snake-skin 

 (Cpr.) 



