169 



is covered with a thin epidermis. It is always destitute of varices 

 and of umbilicus, and bears the same relation to Pyrula that Fas- 

 ciolaria does to Fastis. Indeed we would have more readily ac- 

 quiesced in referring them to Fasciolaria than to Pyrula, 

 although there exists but one fold on the columella, in place of 



wo or three. 

 The excluded ovaries consist of a long series of oval, parallel 



ollicles or disks of little thickness, attached by one side to a con- 

 necting string ; each of these disks contains numerous young ones, 

 of which the shell is very obvious and even tolerably firm in its 

 consistence. Such ovaries are very abundant on our coast. They 

 exhibit at length a rounded perforation in the edge of the follicle, 

 opposite to the string, whence the young shells escape. All this 

 this is very well represented by Lister in his Conchology, plates 

 879 and 881. 



FuLGUR PYRULOIDES. — Specific cliaracter. Pale yellowish or 

 white, with rufous, dilated lines, interrupted in the middle ; suture 

 canaliculated. 



Seha. Mus. vol d. pi QS,fig. 19, 20 ? 



List. Conch., pi 877. 



llartmi, Conch., 3, t. 661,/ 736, 737. {Lam.) 



Encycl Meth., pi 443, /. 2, a, h. {Lam.) 



BuUa ficus, var. b. Gmel 



Fulgur pyruloides, nob. Journ. Acad. Nat. Sci., vol 2, p. 287. 



Pyrula spirata, Lam. Anim. sans Vert., vol 7, p. 142. 



Bulla py rum. Dillwyn, ed. Lister Conch., Index, p. 39. 



Lamarck was unacquainted with the native country of his spi- 

 rata, the description of which he published in August, 1822, 

 which gives the priority to pyruloides, as this was published in 

 July of the same year, twelve months after it had been read to the 

 Academy. It inhabits our Southern coast, and I never found it so 

 far North as New Jersey. PI. 19. 



[Am. Con., p. iii. Sept. 1831.] 



Alasmodonta. — Shell unattached, transverse, equivalved, in- 

 equilateral ; cardinal teeth one in each valve, irregular, simple or 

 biparted ; lateral teeth none ; muscular impressions two principal 



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