126 



TROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



has a suture-line almost identical -with that of Sowerby's figure ; 

 hence it is here regarded as Sowerby's species. 



Judging from D'Orbigny's figure (Pal. Trang. Terr. Jur., vol. i, 

 pi. xxxii) the French specimen appears to be specifically distinct, 

 but Deslongchamps' figure (Le Jura Normand. Monog. vi, pi. ^dii, 

 figs. 1 a-c) of this same example shows that it belongs to Sowerby's 

 species. 



The adult form of this species is represented in the British Museum 

 Collection by the specimen IS.0. C. 4495, the dimensions of which are 



h 



Fig. VII. — Nautilus suhsinuatus, D'Orb. a, lateral view of innermost whorls, showing 

 ornaments of young shell ; h, front view of the same, showing ornaments, and 

 the position of the siphuncle. Inferior Oolite : Dundry. c, lateral view of 

 a somewhat larger example, showing the reticulated ornaments of the test up 

 to a diameter of about 32mm., passing into the longitudinal strife which are 

 confined to the peripheral area ; d, front view of same, showing ornaments of 

 test and position of siphuncle. Inferior Oolite : Halfway House, near 

 Sherborne. Drawn from specimens in the British Museum Collection [67,909 

 and C. 4229]. Natural size. 



given above ; the younger stages being exhibited by the specimens 

 Nos. 67,909 and C. 4229 in the same collection. The former has the 

 following dimensions : — Diameter, 40 mm. ; height of outer whorl, 



