GASTEEOPODA. 139 



4. Adeoebis subcarinatus. Mont. Tab. XV, fig. 8. 



Helix subcarinatus. Mont. Test. Brit. p. 438, t. 7, fig. 9, 1803. 

 Trociius subcarinatus. Brown. Conch. Illust. p. 51, fig. 16-17, 1827. 



— rugosus. Brown. Wern. Mem. ii, 520, t. 2-1, fig. 5, {Flem.) 

 Cingula. subcarinata. Flem. Brit. An. p. 305, 1828. 

 Delpiiinui.a trigonostoma. Bast. Bord. foss. pi. 4, fig. 10, 1825. 

 Adeorbis subcarinatus. S. Wood. Catalogue 1842. 



Trochus trigonostomus. Nyst. Coq. foss. de Belg. p. 385, pi. 35, fig. 23, 1844. 

 Natica subcarinata. Phil. En. Moll. Sic. vol. ii, p. 141, t. 24, fig. 13, 1844. 



A. Testa pusilld, orbiculato-depressd, spird brevi ; anfractibus tribus ; subtus planatis ; 

 longitudinaliter lineatis, et transversim cingulatis ; cingulis elevatis ; aperturd magna 

 mbtetragond ; umbilico lato. 



Shell small, thick, and strong, with three whorls rapidly enlarging, flattened 

 beneath, covered with four elevated ridges, one of which is in the centre of the 

 base ; obliquely crenulated between the ridges ; aperture large, subquadrangular ; 

 outer lip curved and expanded ; umbilicus large and deep. 



Diameter, yq of an inch. 



Locality. Cor. Crag, Sutton. 



Red Crag, Sutton. Recent, Britain. 



This shell is rare in my cabinet. I have no doubt of its identity with the 

 recent British species, and the figures above referred to are presumed to be the 

 same. Our shell has four distinct ridges — three on the upper part of the whorl, 

 at unequal distances, and one upon the centre of the base, with a large and patulous 

 mouth of a somewhat quadrate form, deeply sinuous on the inner side, with an 

 incipient canal both at the upper and lower angles of the mouth ; the upper one 

 raising the shell slightly at the sature, which gives a depression on the volution. 



5. Adeoebis ptjlchealis. S. Wood. Tab. XV, fig. 4. 



Margarita helicina. S. Wood. Catalogue 1842. 



A. Testa minu id, tenui, pellucidd (?), depressd, suborbiculari, heliciformi ; anfractibus 

 tribus, superne convexis, subtus planiusculis, transversim tenuissime striatis ; aperturd 

 patente, obtuse angulato ; umbilico magno, prof undo ; peritremd acuta, superne incurvd 

 prominente, intus et infra valde sinuatd. 



Shell small, thin, and probably pellucid in the recent state ; depressed and sub- 

 orbicular, heliciform, very finely striated along the volutions ; volutions three, 

 rapidly increasing ; convex above and rather flat beneath, obtusely angulated on 

 the outer edge ; aperture large and wide, somewhat angular, with a large and deep 

 umbilicus ; peritreme sharp, slightly interrupted by the volution, curved, and pro- 

 jecting on the upper side, and deeply sinuated on the inner margin. 



Diameter, \ of an inch ; altitude, \ the diameter. 



Localitg. Cor. Crag, Sutton. 



