Notes on Shells. 385 



baracters with the other, that the description needs very little,, 

 if any correction. The epidimis were entire, and the protu- 

 berances on the pillar remarkably similar to those of the shell 

 described. It is preserved in Dr. Mitchill's cabinet, and was 

 received from Don Pedro Abadea of Lima. Hab. Quito 

 Island, near Guayaquil. 



Natica Helicoioes.- 



This shell, of which it appears, hy the Zoological Journal, 

 volume I. page 60, that there was only one specimen in Eng- 

 land, and another in France, is rather common in our collec- 

 tions. I have reserved a specimen for the authors of the 

 Journal, who say that it must bear my designation rather than 

 theirs. 



Cypbjea Maculata.* 



I had some doubts, as expressed, when I announced this 

 shell ; but I have none now. Mr. Gray says it is a variety 

 of the C. Arabica, as described by him. In this he is under 

 a mistake. I have fully traced its history. I have all the va- 

 rieties of C. Arabica mentioned by him, and several others ; 

 and the Maculnta is constantly and essentially different from 

 any of them It never has brown lines or reiicuiations on the 

 back, and has always a large dark brown or black spot on the 

 centre of the base. The first which I saw, is that from which 

 the figure was taken ; but since that time, numerous speci- 

 mens have been brought from the Pacific. In its young state, 

 the inside is very pale violet, nearly white, and the outside 

 clouded with zig-zag bands, and light spots resembling the 

 young of C. Mauritiana. As it advances in age, the back 

 becomes a dark reddish brown, variegated with well-defined 

 round white spots, resembling Lamarck's C. Cervina. The 

 teeth are nearly or quite black, and the basal spot is of the 

 same color, Mr. Gray does not mention a black spot on the 



