134 



PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



the present species has more inflated whorls and a more convex 

 nmhilical margin, while the convex and imperfectly- defined umbilical 

 margin at once distinguishes it from Nautilus iSmithi} 



Form, and Loc. — The specimen No. C. 3181 is labelled " Sauzei- 

 zone, Sherborne," but Mr. Buckman, who has examined it, believes 

 it to be "either from the Sauzei- or from the TFitcJielUa-zoTie, 

 Sherborne, the matrix being whitish with green grains." The other 

 examples (Nos. C. 4489 and C. 4496) are, in Mr. Euckman's opinion, 

 from "the bottom bed of the 'fossil-bed' of Sandford Lane with 

 Ammonites of fisnilohutus type." 



9, jS'autilus subkotdndus, n.sp. Fig. XII. 



Type.— Bxixhli Museum Coll., No. C. 3183. 



Spi-xific Characters. — Shell subgiobose, somewhat compressed ; 

 greatest thickness near the edge of the umbilicus, about two-thirds 

 of the diameter of the shell ; height of outer whorl about five-ninths of 



Fig, XII. — Nautilus subrotundus, n.sp. a, lateral view of the type-speciraeu ; 

 b, front view of the same. Inferior Oolite : Sherborne, Dorset. Drawn 

 from the example in the British Museum Collection [C. 3183]. Eather more 

 than one-half natiu-al size. 



the diameter of the shell. "Whorls few (? number) ; inclusion nearly 

 complete ; umbilicus small, deep, with rounded margin. Whorl 

 semi- elliptical in section, the height five-sixths of the width; 

 indented to nearly two-fifths of its height by the preceding whorl ; 

 periphery broadly convex, continuous with the sides ; sides feebly 

 convex, passing imperceptibly into the inner area ; inner area convex, 

 imperfectly defined. Body - chamber not seen. Chambers rather 



» A. n. Foord & G. C. Crick: Ann. & Mag. Nat. Hist., ser. vi, vol. v, p. 287, 

 fi-. 16. 



