938 PROCEEDINGS OF THE NATIONAL MUSEUM. 



■tmdata, a\ liich occurs in Greenland, ])ut is very rare there, and really 

 is characteristic of the fauna farther south. 



The Asf((i'ti' fauna of the American hemispliere thus consists of 27 

 species, 1 I xm no- Antarctic, 10 Arctic, 13 P^ast and 10 West American. 

 Doubtless a more thofouo-h exploration of the arctic and abyssal seas 

 in both oceans mioht add a few more species and somewhat change 

 the above figures. 



In the geographical lists >yhich follow the names haye appended to 

 them the date of description. The more detailed references, if desired 

 may be had from the bibliography in the Journal of Conchology for 

 1881, giyen by Mr. Edgar A. Smith, pages 2()1-201. 



The plates contain hguresof the newly d(^scribedor untigured forms. 



LIST OF THE SPECIES OF THE EASTERN COAST. 

 ASTARTE CASTANEA Say, 1822. 



Coast of Nova Scotia and southward to the vicinity of Cape Hat- 

 teras, North Carolina, in .5 to 65 fathoms. 



A variety, p!cea Gould, 1841, has blackish tarry periostracum. It 

 has been collected at Chelsea Beach, Massachusetts, and Sandy Hook, 

 New Jersey. The typical form is smooth, equilateral, polished, of a 

 rich reddish chestnut l)rown, and with sharply crenate margins. 



Totten described a variety, 2>'>'0cera^ from Provincetown Harbor, 

 Massachusetts, in 1835. It is characterized by a dull yello^y brown 

 periostracum and obliquely produced high beaks. It would seem that 

 the peculiar environment is connected with these characters, as the 

 locality is so isolated as to be almost like an oceanic island, and on the 

 Pacific coast on such islands exclusively a variety of .1. rollandi is 

 found difi'ering from the type in the same way. 



ASTARTE UNDATA Gould, 1841. 



Greenland and adjacent arctic waters, and south to Massachusetts 

 Bay, and in deep cold water to the vicinity of Chesapeake Bay. The 

 range in depth is from 5 to lol fathoms. 



Dull chestnut l)rowni, subtrigonal as a rule, l)ut variable in outline, 

 with 10 to 25 concentric ripples, sometimes obsolete near the ventral 

 margin. When the ripj^les are few, prominent, and distant, we have 

 the variety latimlca Hanley, 1843, of which perhaps .1. mortonl Sow- 

 erby, 1874, is a mutation. This species was mistakenly identified 

 with the European .4. sulcata Da Costa by early American writers 

 and by Jeffreys. A pale variety was named A. lutea by Perkins in 

 1869. 



ASTARTE SUByEQUILATERA Sowerby, 1854. 



Davis Strait and southward, usually in rather deep water, along the 

 eastern coast of the United States to the vicinity of Cape Florida in 

 22 to 410 fathoms. 



