1854.] 31 



B. maximum, Con. : B. perversum, Lam. ; B. rugosum, Con.; B. tuberculatum, 

 Con. ; B. gibbosum, Con. The last is a recent species. (Fulgur.) 



Sycotypus, Browne. Ficus, Bolton. 

 S. Mississippiensis, Con.; S. (pyrula) penita, Con. 



Porcellana, Adans. 



P. crassilabra, Con. ; C. denticulata, Con. ; C. eburneola, Con. ; C larvata, 

 Con. ; C. limatula, Con. : C. perexigua, Con. 



Recent species. P. P. succinea, Con. ; P. albilabris, Co?i. (Marginella.) 



Amphiceras, Gronovius. 

 A. iota, Con. (Ovula.) 



Distortrix, Link. 

 D. crassidens, Con. (Triton.) 



Gyrineum, Link. 

 G. Maclurii, Con, (Ranella.) 



Yolutilithes, Swains. 

 V. Sayana, Con. ; V. petrosa, Con. (Voluta.) 



Svvainson includes in this genus the volutes with a callus, as V. rarispina, of 

 which I have proposed the genus Atiileta. 



Turris, Humph. 

 Gray refers Pleurotoma, Lam. to this genus, but Hermannsen, Turritella. 

 Where there is no diagnosis, and such discrepancy of opinion exists, Turris can 

 hardly be acknowledged. 



Notes on Shells, with descriptions of three recent and one Fossil Species. 



By T. A. Conrad. 



Gxathodon flexuosum, Con. Amer. Journal of Science and Arts, Vol. 3S , 

 p. 93, (figured,) 1840. 



G. rostratum, Petit. 1853. Rev. et Mail, de Zool., p. 552. 



G. trigonum, Petit, is probably identical with G. Lecontei, Con., fossil in Cali- 

 fornia. Journ, Acad. Nat. Sc, Jan., 1853. Petit's description was published 

 July, 1853. 



Note on the genus Trigonella, Con. 

 This name being superseded, I propose to substitute that of Pachydesma. 



Description of a new Dolium. 



~D. album. Oblong-suboval, with convpx ribs, which are closely arranged, 

 except on the shoulder; about 18 on the body whorl ; spire conical, with rounded 

 volutions, columella perforated at base; lip simple, margin acute. 



This species most nearly resembles D. penlix in form, but is proportionally 

 much narrower, with the ribs more distant and prominent on the shoulder, and 

 with a channel round the suture which the other does not possess. The spire is 

 less elevated, the species much smaller, and the color nearly white without spots. 



Description of a veto Conularia. 



C indentata. Elongated, quadrate, tapering very gradually, angles some- 

 what truncated and crossed by numerous indentations ; surface minutely granu- 

 lated by fine equal decussated iines. 



Locality. Galena, 111. IVlr. Germain. 



This species has distant septa, and the middle of each side has an obsolete, 

 slightly impressed, longitudinal line ; on the cast there are two carinated ap- 

 proximate linps, with an impressed line on each side of them. 



4 



