THE NAUTILUS. 107 



Cuspldaria cleryann, d'Orb. (Sphena) : ori'g. descr., teste E. A. Smith. 



Gostellata, Desh. : Guppy, Proc. Geol. Soc, 1866, p. 575 (foss.) 

 =? ornatissiina d'Orb. 

 Cytherea carbasea, Guppy: Guppy, Geol. Mag., 1874 (foss.). 



plaiilvleta, Guppy : Guppy, Geol. Mag., 1874 (foss.). 



trigonella, Lam. : Vendryes MS. Cat. 



afflnis, Gmel.: Vendryes Coll. 

 Dione, Gray=Cytherea, subg. 



albida, Gmel. : Desh., Cat. Conch. B. Mus., 1 (1853), p. 69. 



convexa, Say : Bowdeu, Vendryes MS. (foss.). 



maculata, L. : Vendryes Coll. 

 Diplodonta candeana ? d'Orb : Bowden, Vendryes MS. (foss.). 



janeirensis, Rve. : Hunt's Bay, Vendryes Coll. 



soror, C. B. Ad. : Dall., Bull. 37, U. S. N. Mus,, p. 52. 



[_To be concluded in next number.l 



NOTICES OF NEW CHITONS, I. 



BY II. A. riLSBRY, 



Meturoplax n. subg. of AcanthocMtes. 



Subg. char. : — valves i to vii as in Acanthochites, but dorsal 

 (jugular) areas indistinctly differentiated ; valve viii having the mu- 

 cro posterior, the insertion plate strongly directed forward, with one 

 slit on each side, and no sinus behind. Girdle as in Acanthochites. 

 Type, A. retrojecius. 



This group holds the same relation to Acanthochites that Pallo- 

 chiton holds to Choitoplenra. It is a variation distinctly in the direc- 

 tion of the Cryptoplacidw, recalling Choneplax, and clearly showing 

 the Acanthochitoid genesis of that family. 

 A. retrojectus n. sp. 



Shell small, narrow and elongated, convex, not carinated ; black 

 or black-brown, with a whitish " v " or three white stripes on each 

 valve, sometimes broadly maculated with whitish at the sides. 



Intermediate valves moderately beaked (except valve ii, the pos- 

 terior margin of which is straight), sculptured with comparatively 

 coarse, rounded, scattered pustules, which become smaller and more 

 crowded toward the middle, and are lower and less distinct on the 

 ridge, no areas being distinctly differentiated on the valves. End 



