128 THE NAUTILUS. 



Aesopus metcalfei Reeve, of tlie Antilles. The coloration recalls 

 that of the common Californian Astyris. 



An examination of the sif'tings dredged by Mr. C. W. Gripp, out- 

 side the Kelp beds off the entrance to San Diego harbor, in 16 to 20 

 fathoms, has resulted in the discovery of several interesting shells. 

 Mangilia mterlirata Stearns has its range extended southward from 

 San Luis Obispo, A new species of Hochefortia, &nd a minute shell' 

 probably allied to the Corbulas, but requiring a new generic name, 

 were among the prizes. 



GRIPPINA Dall, n. g. 



Shell slightly inequivalve, donaciform, small, with a well-marked, 

 rounded, ascending pallial sinus; right valve receiving the dorsal 

 edges of the left in grooves beneath its own dorsal margins ; cardinal 

 teeth two, large, subequal, prominent, horizontally produced and 

 fitting under the beak of the left valve ; resilium strong, compressed, 

 situated between the two cardinals attached under the beak of the 

 left valve, and having on its ventral surface a thin calcareous coating 

 or ossiculum. 



This genus differs from Corbula in the nearly equal valves, the dis- 

 tinct pallial sinus, and the absence of a resiliifer in the left valve; in 

 Corbula, too, the posterior cardinal is rarely developed and always 

 very inferior in size to the anterior tooth. The form of the teeth in 

 the two genera is quite different. Type : 



Grippina caUfornica Dall, n. s. 



Shell minute, subtrigonal, whitish, solid for its size, finely concen- 

 trically sculptured ; beaks moderately elevated, smooth ; inner mar- 

 gins of the valves smooth, the left valve with no hinge-plate; a narrow 

 lanceolate lunule and subequal, similar escutcheon present; each 

 bounded by a marked ridge ; outside of the escutcheon a second ra- 

 diating ridge extends from the beak to the lower posterior margin of 

 the valves but without producing a notable angulation of the margin. 

 Interior of the valves dull white, the muscular impressions and pallial 

 line distinct. Length 2.5, height 1.2, diameter 0.7 mm. 



For other details see the generic description. 



Rochefortla gi'ippi Dall, n. s. 

 Shell small, thin, equilateral, ovoid, with a dull brownish perios- 



