28 FOSSILS FROM SOUTHEBN UNITED STATES— BALL. voL.xvniJ 



Amiua, iSaiito Domingo, and the types of Mr. Guppy. It may be added 

 that the figure given by Gabb in 1872 is not taken from one of his own 

 specimens, but is a bad copy of one of Orbiguy's figures, with the spiral 

 striation drawn as if it ran obliquely. The Phocene specimen referred 

 to C. oviim-lacerti by me in 1890, when compared with Guppy's original, 

 proves to be a hirger and more slender shell, which will require a sepa- 

 rate name. 



RETUSA CHIPOLANA, new species. 



Shell elougatepyriform, posteriorly attenuated, smooth, except for^ 

 lines of growth; spire sunken, with a small perforation over it ; aper- 

 ture very narrow, except in front, as long as the shell, produced behind 

 the suture at the margin of the apical pit; outer lip thin, straight, 

 rounded insensibly into the pillar in front; pillar lip simple, thin, 

 reflected, with a groove behind it; body with little or no callus. Lon- 

 gitude, 5.5; maximum diameter, 2,25 mm. 



Habitat. — Chipola beds (2213), on the Chattahoochee, and also at Oak 

 Grove, on the Yellow Kiver. 



Types.— 1^0. 113879 U. S. N. M., and in the collection of Mr. Aldrich. 



SCAPHANDER LANGDONI, new species. 



Shell small, rather slender for the genus, with the spire concealed 

 and covered by a small, rather shallow pit; aperture wide, as long as 

 the shell, with a wide sutural sinus, a straight outer lip, gradually 

 rounded into the pillar in front; pillar simple, solid; body with little or 

 no callus ; surface polished, transversely marked by lines of growth and 

 frequently by small, narrow, parallel waves, stronger toward the mid- 

 dle of the whorl; spiral sculiiture of fine, rather distant, punctate, 

 incised lines, uniformly disposed, but varying somewhat in different 

 specimens; there is no constriction of the whorl in front of the sutural 

 keel and no groove behind the pillar, the axis is widely pervious, reveal- 

 ing the si^ire. Longitude, 13; maximum diameter 6.5 mm. 



Habitat,— Chiiwla beds (2211, 2213). 1 



Tijpes.—^os. 113883, 113884, U. S. N. M.; also in the collection of Mr. 

 Aldrich. 



This species is more attenuated behind than aS". jj////<».s', Aldrich, and 

 less so than the recent 8. ivafsoni, Dall; in proportions and sculpture 

 and combination of characters this little species does not appear to 

 agree closely with any of those previously known from the region. It 

 is named in honor of Mr. D. W. Langdon, lately of the State survey 

 of Alabama, and to whom are due the first section of the Alum lUuff 

 locality and the discrimination of the Chattahoochee group of rocks. 



ATYS CEDEMATA, new species. 



Shell small, inflated, rapidly attenuated in front and behind, periph- ■' 

 ery Dromiueut; aperture as long as the shell, extending behind the 



