﻿STROPIIITLTS 357 



shell somewhat cut away. The posterior end is very slightly 

 pointed about midway up from the base. The description giv- 

 en by its author of the teeth and beaks might indicate that it 

 was a Strophitiis. and Conrad places it in this group in his 

 Synopsis of 1853. 



Section JuGosus n. sec. 



Shell with the dorsal slope strongly subradially plicate; teet'"' 

 unusually strong. 



Type, Strophitiis zvrightiamis Walker. 



Strophitus WRiGHTiANUS Walker. 



Shell irregular, subrhomiboid, inflated, scarcely subsolid, 

 nearly equilateral, gaping in front ; beaks very full and high, 

 turned in over a slight lunule, their sculpture consisting of a 

 few strong ridges, which seem to run nearly parallel with the 

 growth lines ; anterior end rounded, cut away a very little be- 

 low ; base line evenly curved ; outline of dorsal slope strongly 

 and evenly curved; posterior ridge high, angled, ending in a 

 blunt point below the median line of the shell ; dorsal slope 

 subtruncate, covered with strong, su'bradial, curved, somewhat 

 broken ridges ; disk with light, uneven growth lines ; epider- 

 mis delicately, concentrically wrinkled, almost jet black, lighter 

 at the umbones, shining ; left valve with an irregular tooth un- 

 der the beak and a vestigial one in front of the beak ; right 

 valve with a roughened tooth in front of the beak ; laterals 

 almost wanting ; beak cavities deep ; anterior muscle scars 

 distinct ; posterior scars faint ; nacre bluish with a milky tint, 

 a little thicker in front. 



Length 54, height 38, diam. 30.5 mm. 



Type locality, Ochlochnee River, Florida. 

 Strophitus zvrightianus W^\I,K1CR, Naut. XV, 1901, p. 65. pi. 



III. 



I cannot be certain as to the generic position of this species 

 without an examination of the animal. The general appear- 

 ance of the shell would indicate that it was a Strophitus allied 

 to S. tombighccnsis. but it differs from that of any other spe- 



