206 NATICID^. 



AMAUROPSis, Moreli. Shell with canaliculated sutures. Scarcely 

 distinct from Amaura, N. canaliculata, Gould (^Ixiii, 50). 



AMAURELLAjA. Ad.,186*r. Shell Small, ovate, imperforate, white, 

 shining, apex submammillary ; aperture acuminately ovate ; lip 

 arcuate, simple, thick. 3 sp, Japan. N. Japonica, A. Ad. 



LARiNA, A. Adams. (Robinsonia, Nevill.) Shell thin, delicate, 

 composed of a few rapidly increasing whorls ; not umbilicated, 

 columella simple, lip not reflexed. Epidermis olivaceous. 

 Operculum horny, annular. Somewhat resembles Amauropsis. 

 6 sp. Indian Ocean, Australia. N. Gey Ionic a, '[^feyill (Ixiii, 51). 

 This is possibly a fresh-water shell, and perhaps belongs in 

 Paludinidse. 



NATicopsis, M'Coy. (Neritomopsis, Waagen, 1880.) Shell 

 imperforate ; inner lip very thick, spreading. Operculum shelly. 

 Carboniferous Limestone ; Great Britain. N. Fhillipsii, M'Coy 

 (Ixiv, 6t). 



isoNEMA, Meek. (Section of Naticopsis.) 7. humilis, Meek 

 (Ixiv, 11). Devonian; Ohio. 



TRACHYDOMiA, Meek and Worthen, 1866. (Section of Nati- 

 copsis.) Surface covered by small regularly disposed tubercles. 

 N. nodosa., M. and W. Carboniferous ; Illinois. 



EUSPIRA (Agassiz), Morris and Lycett. (Holopea, Hall, in 

 part.) Spire more or less elevated ; whorls few, distinct, angu- 

 latedorcarinated. Inferior Oolite ; England. "Euspira presents 

 considerable affinities to the Palaeozoic genus Scalites, Hall, in 

 the lines of growth having the appearance of a slight fissure, 

 where the angle occurs in the volution." — MoRR. and Lyc. N. 

 canaliciilata, Morr. and Lyc. (Ixiv, 84). 



Gyrodes, Conrad, 1860. 



Distr. — Cretaceous ; IT. S., Europe, India. G. alveata, Conr. 

 (Ixiv, 10). 



Shell depressed-globose ; aperture generally angular or nar- 

 rowly rounded below ; inner lip thin ; umbilicus wide, deep, 

 without callosity, bounded by a revolving carina which is some- 

 times crenate, with occasionally a second small revolving ridge 

 within ; whorls shouldered above, the angle generally wrinkled 

 or crenate. 



Cloughtonia, Hudleston. 



Distr. — G. (Phasianella) cincta, Phillips. Oolite; England. 



Shell short, conical and solid, with a widish base; whorls 

 about five, flat and angular; body-whorl more or less bicarinated 

 with slight depression of the intervening space ; aperture ovate 

 to ovate-oblong, rounded anteriorly ; pillar nearly straight, with 

 little or no callus. 



This group seems to occupy an intermediate position between 

 Natica and Chemnitzia. 



