NO. 1312. S YNOPSIS OF THE VENERID.E—DA LL. 371 



An elongate, squarish, white species, with the anterior end some- 

 what attenuated, frequently confused with bleached valves of P. 



fulininata. 



PITARIA FULMINATA Menke, 1830. 



Cape Hatteras, North Carolina, to Bennuda, the Antilles, and Brazil, 

 in depths varying from a few feet to ITo fathoms, the latter locality 

 having afforded living young specimens. 



This is supposed by Krebs to be the Cytherea hehra?a of Lamarck, 

 1818. 



This species appears to be very common in the West Indies. Nor- 

 mall}" it is white, with radial or zigzag painting of bright j^ellow 

 brown, under a chalky periostracum. The dead valves, bleached and 

 worn, are frequentl}" taken for P. alh'tda. It is the Cytherea varkms 

 of Hanley, 18-±-l; C. ruhighiosa Philippi, 1845; but not C.fulmliiata 

 Philippi, 1845, or Venus fulininata Valenciennes, 1827. The latter 

 is a Tivela. 



PITARIA PENISTONI Heilprin, 1889. 



Bermuda, and St. Thomas, West Indies. 



A small thin oval shell, more or less painted with brown outside and 

 with purple inside. 



PITARIA SIMPSONI Dall, 1895. 



West coast of Florida, at Tampa and Sarasota bays, low water to 26 

 fathoms. 



Larger, more trigonal, and solid than the last species, but very simi- 

 larly painted, though it is occasional!}' pure white. This is a modified 

 descendant of the Tertiaiy species of Ilyjjhantosoina. 



PITARIA EUCYMATA Dall, 1889., 



Cape Hatteras, North Carolina, and southward to the Antilles and 

 Cape San Roque, Brazil, in 20 to 111 fathoms. 



Short oval, inflated, elegantly distantly concentrically grooved, pol- 

 ished, and painted with brown and cream color and internally with 

 rose; this rare species is one of the most elegant and attractive shells 

 of the coast. 



PITARIA MUNDA Romer, i860. 



St. Thomas, West Indies. 



A young and dubious shell, as yet untigured. 



PITARIA (HYSTEROCONCHA) DIONE Linnaeus, 1758. 



Texas coast to Costa Rica and Colon; also the Antilles and Trinidad. 



This beautiful and well-known shell has been fortunate in escaping 

 with a single specific S3'nonym, Dtone verieris Desha3^es, 1853, the 

 other names which have been cited for it being derived from authors 

 with no standing in binomial nomenclature, unless we except the 



