102 



Ist and 2ad lateral teeth rather broader than the centrai, with tliree- 

 toothed recurved tip, the 3rd narrow, elongate, with a slight recurved 

 end, the 4th and 5th much larger, oblong and irregular shaped, the 

 4th about half the width of the 5th, with 3 or 4 denticles on the 

 inner side of the upper edge ; the 5th very large, broad, with a 

 large subcentral reflexed lobe ; the lateral teeth are very numerous, 

 subeąual, compressed, transparent, with a recurved tip, which in the 

 inner teeth of the series is bifid. 



3 Ii. 





Teeth of Ceres SaUeana. 



1. Ceres Salleana, Gray. 



Shell yellow, upper surface conical, convex, rugulose, with nu- 

 merous close, parallel, granular concentric strise ; lower surface 

 smooth, polished ; keel acute, expanded. 



Hab. Cordera, State of Vera Cruz, Mexico, in dense woods, under 

 dead leaves (M. A. Sallė). 



2. Ceres eolina. Proserpina eolina, Duclos, Mag. Zool. 



The shell orange ; upper surface flat, rugulose, with numerous 

 short, parallel, diverging, narrow, sharp ridges ; keel very acute, bent 

 up ; lower surface convex, subhemispherical, polished, orange ; axial 

 callosity thin, semitransparent, whitish. 



6. Remarks on Niką edulis, Risso. 

 By William Thompson. 



The possession of a healthy specimen of Niką edulis has enabled 

 me to offer the following remarks, which, I trust, may add some- 

 thing new to what is already known of this species. 



The first specimen I obtained by dredging on the 2ud July, 1853. 

 I find by my notes, which were made at the time, that it was a 

 female, and in spawn ; the ova were darkish green, the animal itself 

 was of a cream colour, and spotted with red dots ; the spots were 

 of different sizes, perfectly round, and rather thickly and regularly 

 placed. This specimen was dead before I examined it, and this will 

 account for the difference of colour as contrasted with the specimen, 

 the more immediate subject of the present paper. I had previously 

 obtained one specimen, and a third specimen, also in spawn, was 



