Gasteropoda. |23 Perissolax. 



Hombroniana, d'Orb, Sp. (Fusus), Gabb, 1861. Chili. C. 



Durvillei, '^ " " " C. 



longirostris, " " " " C. 



octolirata, Con. Sp. (Ficus), Gabb, 1861. Ala., Miss., N. J. C. 



trivolva, Gabb (Fusus), Gabb, 1861. N. J. C. 



Richardsonii ?, Tuomey, Sp. (Pyrula), Gabb, 1861. Ala. 6'. 



PHASIANELLA, Lam. 1804. 



Beadlei, d'Orb. Prod. 152. Syria. U. G. 



Ervina, d'Orb. P. F. 234, 188, 1-3. Fr. G. 



Formosa, Sow. G. T. 2d s. vol. iv, pi. 18, f. 14. E. T. G. 



Gaultina, d'Orb. P. F. 233, 187, 3. Fr. G, 



Haleana,* d'Orb. Prod. 224. Ala. O. 



incerfa, Forbes (Fusus subincertus), G. T. vol. vii, 133, 13, 8. 

 ?lamellosa, Roem. Sp. (Natica), d'Orb. Prod. 224. G. C. 



Uneolafa, Reuss (Actaeon ?), Bohm. Kreid. 49, 10, 19. 

 Neocomensis, d'Orb. P. F. 232, 187, 1. Fr. N. 



ovula, d'Orb. Prod. 130. Fr. G. 



perovata, Sbumard, 1860, Trans. St. Louis Acad. 597. Texas. C. 

 punctata, Gabb, 1860, Jour. Acad. 2d s. vol. iv, 299, 48, 3. 



N. J. C. 



pusilla. Sow. G. T. 2d s. vol. iv, pi. 18, f. 13. E. U. G. 



Royana, d'Orb. Prod. 224. Fr. G. 



Sowerbyi, d'Orb. Prod. 152. E. U. G. 



striata, Sow. (Sowerbyi), G. T. vol. iv, 241, 18, 15, 7iot Striata 



M. Con. 

 supracretacea, d'Orb. P. F. 234, 187, 4. Fr. G. 



PHORUS, Montf. 1810. 

 canaliculatus, d'Orb. P. F. 180, 176, 13, 14. Fr. G. 



it. This is the only species outside of the limits of the chalk, with which I am 

 acquainted, that seems even closely related to it. 



Four of the species are found in the upper chalk of North America : the re- 

 maining three are from a deposit of the same age in Chili, and they are, in both 

 cases, associated with species of Pugxellus, another chalk genus. 



The characteristic markings are revolving ribs or lines, though some of the spe- 

 cies are plain, with subangular whorls. This appears to be the case both with P 

 trivolva and P. longirostris. 



* "Petite espece bein plus courte que le Ph. supracretacea.^^ This is all the 

 description given. 



