GASTEROPODA. 139 



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



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

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



— EUGOSUs. Brown. Wern. Mem. ii, 520, t. 24, fig. 5, {Flem.) 

 CiNGULA SUBCARINATA. Flem. Brit. An. p. 305, 1828. 

 Delphinula trigonostoma. Bast. Bord. foss. pi. 4, fig. 10, 1825. 

 Abeokbis subcaeinatus. S. Wood. Catalogue 1842. 



Trochus teigonostomus. 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, orhicidato-depressd, spird brevi ; anfraciibus tribus ; subtus 2}Ianatis ; 

 lovffitudinaliter lineatis, et transversim cingidatis ; cinrjidis eleDutis ; aperturd magna 

 mibtetragond ; umbdico lato. 



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

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

 obhquely crenulated between the ridges ; aperture large, subquadrangular ; outer lip 

 curved and expanded ; umbilicus large and deep. 



Diameter^ -^ 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 imequal 

 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 suture, which gives a depression on the volution. 



5. Adeorbis pulchralis. S. Wood. Tab. XV, fig. 4. 



Margarita helicina. S. Wood. Catalogue 1842. 



A. Testa minutd, tenui, pelliicidd Q), depressd, stiborbiculari, heliciformi ; anfractibu9 

 tribus, superne convexis, subtu-s pi^'^^^^^isculis, transversim tenuissime striatis ; aperturd 

 patente, obtuse angulato ; umbilico magna, prof undo ; peritremd acutd, 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 projecting on the 

 upper side, and deeply sinuated on the inner margin. 



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



Locality. Cor. Crag, Sutton. 



