THE NAUTILUS. 65 



Ennea Iwakawa var. yakushimce nov. Similar to E. Iwakawa of 

 Nippon and Kiusiu Islands in sculpture and aperture, but of a de- 

 cidedly broader, more swollen shape. Yakushima (Mr. Y. Hirase, 

 no. 680&, types; also 680a). 



A NEW SPECIES OF STROPHITUS. 



BY BRYANT WALKER. 



Strophitus wrightianus, n. sp. Plate III. 



Shell irregularly subrhomboidal, inflated, scarcely sub-solid, 

 nearly equilateral ; beaks very full and high, turned in over a slight 

 lunule ; their sculpture consisting of a few strong ridges that run 

 nearly parallel with the growth lines ; anterior end rounded, elevated 

 above the line of the hinge superiorly and slightly cut away below ; 

 base line evenly curved ; posterior ridge angled, ending in a blunt 

 point below the median line of the shell ; dorsal slope subtruncate, 

 covered with strong, subconcentric, somewhat broken ridges extend- 

 ing from the posterior ridge to the margin ; disk with light uneven 

 growth lines; epidermis almost jet black, lighter on the beaks, shin- 

 ing, with occasional indications of very light transverse sculpture 

 similar to that on the dorsal slope ; left valve with an irregular tooth 

 and a vestigeal one in front of it ; right valve with a roughened tooth 

 in front of the beaks ; laterals almost wanting ; beak cavities deep ; 

 anterior muscle scars distinct; posterior scars faint; nacre bluish 

 white, a little thicker in front. 



Length 54 mm., height 38 mm., width 31^ mm. 



A single specimen only of this fine species occurred in two barrels 

 of Unionidce received from Messrs B. F. and G. H. King, collected 

 in the tributaries of the Flint river, Baker county, Ga. It differs 

 from all other known species in the strong ridges which cover the 

 dorsal slope. It seems to be most nearly related to S. tombigbeensis 

 Lea, and has the " obtruded anterior margin " characteristic of that 

 species. 



Mr. C. T. Simpson, to whom the specimen was submitted for ex- 

 amination, and to whom I am indebted for assistance in preparing 

 the foregoing description, writes in reference to it : "I know of 

 nothing at all like it. In fact it is so different from anything that I 

 have seen or read of that I am at a loss to know just where to place 



