270 TRANSACTIONS OF THE WAGNER FREE 



intersections ; whorls slightly rounded, base smooth, somewhat excavated ; 

 aperture subquadrate ; pillar and canal short, simple ; suture very distinct. 

 Lon. of shell 4.75 ; max. diam. 1.2 mm. 



This recalls C. tiibercularis, hnt is smaller, more slender, with sharper and 

 finer sculpture and a different base. The nucleus is proportionately larger 

 than in C. tubercularis, and the nodules at the intersections hardly developed. 

 Only a single specimen was obtained. 



Section Metaxia Monterosato. 

 Cerithiopsis metaxse Delia Chiaje var. tseniolata Dall. 

 C. 7nelax(T, var. ii^Jiiolata Dall, Blake, Gastr., p. 256, 1889. 



Pliocene of the Caloosahatchie beds. 



A single fragment of this very interesting form was found in the marl. 



Cerithiopsis Aldrichi Meyer appears to be a good species of Metaxia. It 

 is from the Red Bluff Eocene. It is not much larger than C. metaxcz, but ex- 

 hibits a very remarkable character in having five or six nuclear whorls ex- 

 hibiting very beautiful arcuate striation. No other species of the group has 

 so large a nuclear part. I have been able, through the courtesy of Mr. Al- 

 drich, to examine Meyer's types, and thus to clear up the uncertainty which 

 has hung about several of the Cerithiacea. 



Cerithiopsis {Lovenelld) nassjila has been identified by Meyer from the 

 type of Conrad at Philadelphia. It is the same species which was afterward 

 described, from a young tip, as Cerithiopsis Jacksonensis Meyer. In this 

 species, as in many others, the apical whorls are more rounded than the 

 later ones of the same specimen, and when a tip with a few apical whorls is 

 compared with a body-whorl or more broken off the other end of the shell, 

 the two look quite different. Fragments of large specimens from Moody's 

 Branch, near Jackson, Miss., and from Newton, Miss., were afterward identi- 

 fied by Meyer with his C. Aldi'ichi — a singular error, since the two belong 

 to different subgenera. Another Lovenella much resembling C. nassula is C. 

 Langdoni Aldrich. So far as the specimens now available go, I hesitate to 

 unite them ; nevertheless, it is probable they will eventually be regarded as 

 varieties of C. nassnla. 



Two other species of Cerithiopsis, which do not seem to be described, 

 appear in the material sent by Mr. Aldrich, who will name them later. They 

 are both Eocene and belong to the typical group in the genus. 



It is probable that TracliyscJicenium Cossmann is synonymous with Metaxia. 

 Cerithiopsis alternata Gabb, from the Tejon Eocene of California, judging by 

 the figure, might be referred to Metaxia. 



Beside the species of Cerithiopsis mentioned above, I find in the litera- 

 ture a C bicostellatus Conrad which has not been figured or identifiably de- 

 scribed. It is from the Eocene of St. Matthew's parish, Orangeburg district, 



