262 [January, 



GASTRIDIUM, Sow. 



G. vet/estum, Con., PI. xvii. fig 4. Proceed. Acad. Nat. Sc, vol. 6, p. 321. 



The Jackson specimens of this species, being more perfect than those of 

 Claiborne, Alabama, exhibit six or seven denticulations below the tooth on the 

 labrum, which denticle is very short ; the base of the shell is carinated, and an 

 acute carinated line runs within the umbilicus near the outer margin. 



CYPR^A, Lin. 



1. C.pinguis, PI. xvii., fig. 3. Obtusely ovate, rounded at base, but ob- 

 liquely flattened towards the aperture which is very narrow and denticulato- 

 striate on both sides; columella deeply indented near the base, and a dentate line 

 on the margin ; labrum excavated towards the base. 



Allied to C. spkcsroides. Con., of Vicksburg, but much less ventricose and 

 very distinct. 



Subgenus Cypr^edia, Swains. 



2. C.fenestralis, PI. xvii., fig. 5. Ovate, ventricose, decussated with acute, 

 prominent, distant lines, the transverse ones alternated in size; interstices with 

 microscopic lines parallel to the transverse ones ; aperture narrow, much curved 

 above ; columella with four or five plaits. 



This beautiful species is nearly allied to C. elegans, Desh.,but is much broader, 

 and has microscopic regular lines which are not mentioned in the description of 

 the former, and it is probably destitute of them. The plaits on the columella of 

 the Jackson shell are much larger than in its European relative. These two 

 shells are so different from any in the more recent formations that they appear 

 to be entitled to a generic distinction, and they are peculiar to the Eocene period. 



PHORUS, Mont. 



P. reclusug, PI. xvii., fig. 6. Trochiform ; whorls seven, obliquely flattened 

 on the sides; base flattened, slightly excavated near the periphery, striated ; 

 lines profoundly curved, wrinkled, acute, many of them minutely beaded ; base 

 partially covered with a polished calcareous deposit. 



GALEODIA, Link. CASSIDAR1A, Lam. 



G. Peterso7ii, PI. xvii., fig. 9. Obtusely ovate, spire short, scalariform ; body 

 whorl with three distant revolving lines much larger than the others, which are 

 alternated, suture margined by a prominent acute line; inferiorly three revolving 

 lines larger than the others ; lower whorl of the spire carinated in the middle ; 

 longitudinal wrinkled lines veiy fine: labrum margin thickened, somewhat re- 

 flected ; inner margin denticulato-striate, with a prominent tooth near the upper 

 extremity; labrum reflected ; columella striated, inferiorly tuberculato-striate. 



Approaches G. funiculosa {cassidaria) Desh., but very distinct. 



PAPlLLINA,Con. 



Pyriform ; shoulder angular and spinous ; beak long, with an obtuse fold on 

 the columella ; three volutions from the apex forming a papillated summit. 



P. Mlssisdppiensis, PI. xvii., fig. 10. Fusiform, with a series of distant, 

 very prominent spines and longitudinal undulations ; revolving lines prominent, 

 alternated, wrinkled and undulated ; three volutions from the apex entire, and 

 forming the papillary top; fold on the columella obtuse ; beak slightly tortuous. 



In the geology of Mississippi where the shell is figured, 1 have incorrrectly 

 referred it to the genus Clavelithes. To this genus Papillina belongs the Eocene 

 species, Fusics papillatu.s, Con., of Claiborne. I have never met with a species 

 of this genus in the Miocene or more recent formation. It is probably most 

 nearly related to Turbinella. 



