736 DR. J. E. GRAY ON THE CALYPTR^ID/E. [June 27, 



spiral. Base oblong, concave. Aperture very large, oblong, four- 

 sided, not quite so wide as the shell. Axis deeply concave on the 

 right side of the base. 



1. Trochella maculata. 



Calyptraa comma-notata, Sowerby (Galerus chinensis {}), Chenu, 

 Man. f. 2350, 23.51 ; Cahjptraa maculata, Quoy). 



Shell convex, oblique, conical, rather solid ; inside purple. 

 Ilab. New Zealand. 



2. Trochella calyptr/Eformis. 

 Trochus calyptrceformis, Lamk. 



Shell thin, depressed, concentrical, striated ; spire purplish. 

 Hab. ? 



I cannot find in the Museum Collection (including those received 

 from Mr. Cuming) any shell that agrees with Mr. Sowerby's figure 

 of Calyptrcea dilatata (Chenu, Mam. f. 2349). Some specimens 

 of Trochella maculata are oblong or elongate, but they always 

 have a deep impression on the right side of the hinder part of the 

 cavity. 



Mr. Swainson formed a genus for C dilatata under the name of 

 Haliotoideus, which has been adopted as a subgenus by Adams and 

 Chenu. 



Tribe II. Shell oblong ; apex posterior or subposterior, with a 

 transverse plate on the hinder side of the cavity dividing it 

 into two parts. Cryptaina. 



1. Crepipatella, Lesson. 



Crepipatella, sp., Adams. 



Shell subcircular. Internal lamina concave below. Lip sharp, 

 semicircular, separated from the columellar edge by a broad trian- 

 gular slit. 



1. Crepipatella dilatata. 



Crepidula dilatata, Lamk.; Brod. {C. peruviana, Lamk,; Chenu, 

 Man. f. 2352). 

 C. foliacea, Brod, 

 C. nautiloides, Lesson. 

 Hab. Valparaiso ; Straits of Magellan ; Peru. 



Var. I. C. rugulosa, Dunker. 



Var. 2. Shell subcircular, flat. C strigata, Brod. 



Var. 3. Shell oval, thin, more convex, white. C. pallida, Brod. 



2. CrepipxItella foliacea, Brod. 

 Shell lamellar, rugose. 



