Descriptions of New Species of Mar Amelia, 8^c. 5 



rmm for the the original mention of C. histrio. Since then, 

 the munificence of Dr. T. B. Wilson, "of Philadelphia, has 

 supplied the library of the Academy of Natural Sciences of 

 that city with a large number of rare books upon natural his- 

 tory, among which is the Museum Greversianum, from which 

 I am now enabled to quote what is said of the species in 

 question, with Meuschen's references. 



"No. 1381, P. (Porcellana) histrio : elevatior, testa maculis atro-niscis, 

 albida fusco-reticulata. 



Linn. 327 *. sen. o. Seba iii. 55 in No. 23. Lister 659, 3 a. 

 Argenv. Suppl. 2 L. Rumphius 39 R? Petiv. Gaz. 63 b. 



These citations, particularly that of Lister's figure, seem 

 to fix distinctly the history and character of C. histrio as a 

 distinct shell from Martyn's. 



In confirmation of the views expressed in that paper, I am 

 enabled, by the kindness of Dr. Gould, to communicate the 

 following note made by Mr. Couthouy, at Disappointment 

 Island, (A-too-a,) while connected with the IL S. Exploring 

 Expedition, showing that the soft parts of C. reticulata differ 

 essentially from those both of C. arabica and C. histrio. 



" This (C. maculata Barnes C. reticulata Martyri) was 

 published as a distinct species from C. arabica, by Barnes, 

 with very good reason, notwithstanding it was disputed in the 

 same journal by some English author not recollected, who as- 

 serts it to be nothing but a variety of that shell. Q,uoy and 

 Gaimard, however, figure that as having the mouth sprinkled 

 with simple white tubercles, and there is a black band on the 

 extremity of the siphon. In C. maculata the mantle is nearly 

 the color of burnt sienna, with undulating veins of very deep 

 brown, and very thickly ornamented with short, slender, and 

 taper papillae. Towards the aperture it is lighter colored than 

 elsewhere. The white patches on the back are all distinct and 

 separate, as in C. histrio, but the animal is widely distinct from 

 that species.'' 1 



