398 Messrs. Foord and Crick on new and 



ingly small. Body-chamber forming probably half a volu- 

 tion. Aperture wider than high. Septa approximate, the 

 sutures forming a very distinct sigm )idal curve on the sides 

 of the shell ; in passing over the periphery the sutures arc 

 slightly bent backwards. The siphuncle is nearly central. 

 The test is not preserved. 



Remarks. The large specimen (B.M. no. 62 165) upon 

 which the above description is founded is very imperfect, all 

 the inner whorls are wanting, only the two chambers nearest 

 the body-chamber being preserved ; nevertheless the species 

 could be easily recognized by the form of. the sutures and the 

 narrowly rounded periphery. The dimensions of the fossil 

 are as follows : — Greatest diameter about 13 inches, greatest 

 breadth about 1\ inches. 



Horizon. Portland Oolite*. 



Locality. Isle of Portland (?) , Dorsetshire. 



Cretaceous. 

 5. Nautilus radiatuSj J. Sowerby. 



1822. Nautilus radiatus, J. Sowerby, Min. Concli. vol. iv. p. 78, 



pi. ccclvi. 

 1836. Nautilus radiatus, Fitton, Trans. Geol. Soc. ser. 2, vol. iv. pt. ii. 



pp. 204, 367. 

 1838. Nautilus radiatus, d'Archiac, Mem. Soc. Geol. de France, vol. iii. 



p. 278. 

 1840. Nautilus radiatus, d'Orbigny, Paleontologie Francaise, Ten-. 



Cret. vol. i. p. 81, pi. xiv. 

 1845. Nautilus radiatus, Ibbetson and Forbes, Quart. Journ. Geol. Soc. 



vol. i., table feeing p. 197. 

 1845. Nautilus radiatus, Forbes, ibid. p. 353. 

 1849. Nautilus subradiatus, d'Orbigny, Prodr. de Paleont. Stratigr. 



vol. i. p. 145. 



1852. Nautilus squamosus, Giebel, Fauna der Vorwelt, Band iii. Abtb. i. 

 p. 141 (not of Schlotbeim). 



1853. Nautilus radiatus, Sbarpe, Description of the Fossil Remains of 

 Mollusca found in the Chalk of England, Memoirs of the Palseonto- 

 graphical Society, pt. i., Cephalopoda, p. 14, pi. v. figs. la,lb, 2. 



1854. Nautilus radiatus, Morris, Cat. British Fossils, 2nd ed. p. 307. 

 1859. Nautilus Neckerianus, Pictet and Campiche, Descr. des Fossiles 



du Terr. Cret. des Environs de Sainte Croix, Paleont. Suisse, ser. ii. 



pt. i. p. 132, pi. xvi. 

 1862. Nautilus radiatus, Bristow and Etheridge, in Bristow's Geology 



of the Isle of Wight, Mem. Geol. Surv. of Great Britain, Sheet 10, 



p. 137. 

 1881. Nautilus radiatus ?, Etheridge, iu H. B. Woodward's Geology of 



the Country around Norwich, Mem. Geol. Surv. of Great Britain, 



p. 16. 



Sp. char. Shell somewhat compressed upon the sides, 

 rounded upon the periphery ; section of the whorls wider 

 * Portlandien of d'Orbigny. 



