N ATIC1V1E. 1 1 



Conrad, was referred here by me in Structural and Syst. Conch.; 

 its species having been described as Naticse ; it is now placed in 

 Lacunidse. 



Section AMPLOSTOMA, Stoliczka, 1868. 



Subovate, thin, spire short; whorls few, the last large, ventri- 

 cose, produced in front, widely excavated at base ; aperture 

 elongatel}* ovate, subangulated, pillar lip smooth, outer lip 

 dilated and expanded at the margin ; surface nearly smooth. 

 S. auriformis, Stol., Cretaceous, So. India (S. & S. Conch., t. 

 Ixiv, f. 85). 



The characters are exceedingly close to those of the last 

 section. Lysis, Gabb., 1864, which I consider a member of the 

 subfamily Purpurinfe, of Muricida*, has been referred to this 

 neighborhood by Dr. Fischer. 



Subfamily II. Lamellar Unas. 

 Genus LAMELLARIA, Montagu, 1815. 



Shell internal, ear-shaped, thin, pellucid ; spire lateral, very 

 small; aperture large, patulous, both lips regularly arcuated; 

 axis imperforate. No operculum. 



Animal much larger than the shell, which is entirely concealed 

 beneath the dorsal shield ; shield thick, verrucose, notched in 

 front; foot elongated, truncated in front, acuminated behind; 

 eyes at the outer bases of the tentacles. Dentition I'M, the 

 central tooth subtrigonal, with the free margin denticulated and 

 base incurved ; laterals large, the summit lanceolate, the margins 

 denticulate, no marginals (PL 1, fig. 9). 



There are a few living species, and two species in the Miocene. 

 Interesting particulars of the habits of Lamellaria will be found 

 in Structural and Systematic Concholog}-, ii, 209. 



The synonymy includes Marsenia, Leach, 1847 ; Coriocella, 

 Blainv-., 1824; Chelinotus, Swains.. 1840; CryptoceUa, H. A: A. 

 Adams, 1853; Ermsea, Gray, 1857; Cryptothyra, Menke, 1830. 

 Coriocella and Gryptocella have been considered subgenera, but 

 have no important characters ; the former was founded upon an 

 individual accidentally deprived of its shell. The fry, also, 

 have received several generic names (p. 5). 



