94 Description of some New Species of Fossil Shells. 



men, I cannot tell whether this is a constant character or not. It 

 resembles the P. sulcata, Lea, in its furrows, but differs from it 

 in other respects. 



FAMILY PLICACEA. 



Genus Action. — Montfort. 

 A. IcBvis. PI. 1, fig. 4. 



A. testa subulata, polita, lasvi, tenui ; spira valde elevata ; an- 



fractibus , planulatis ; suturis impressis ; columella unipli- 



cata ; apertura quadrilaterali. 



Shell subulate, smooth, polished, thin ; spire very elevated ) 



whorls , flat ; sutures impressed ; columella with one fold ; 



mouth quadrilateral. 



Length . Breadth -05 of an inch. 



Remarks. — This interesting little species somewhat resembles 

 A. elevatus, Lea, but differs from it in having but one fold on the 

 columella, in the shape of the mouth, and in size. The fold 

 on the columella is unusually large for so small a shell. It is the 

 most subulate Actason that I have seen. 



A. magnoplicatus. PI. 1, fig. 5. 



« A. testa turrita, subcrassa, lasvi, polita; anfractibus , pla- 

 nulatis ; suturis impressis ; columella uniplicata, plica magna, 

 acuta; labro acuto ; apertura ovata. sub-effusa. 



Shell turrited, somewhat thick, smooth, polished ; whorls , 



flat ; sutures impressed ; columella with one large sharp fold ; 

 outer lip sharp ; mouth ovate, somewhat effuse. 



Length . Breadth -07 of an inch. 



Remarks. — This little shell is remarkable for its large elevated 

 fold, which is placed in the middle of the columella. The last 

 whorl is angular below. The mouih is .05 of an inch in length. 

 I have but a single whorl of a specimen of this species, but that 

 presents characters so different from those of any species that I 

 have seen, that I have no hesitation in pronouncing it to have 

 been hitherto undescribed. This makes the eleventh Actason 

 described from the tertiary at Claiborne. The striatus described 

 by my father, has been changed by him to alveatus, the former 

 name having been pre-occupied by Mr. Sowerby. 



