330 Annals of tlie South African Museum. 



Avellana sculptiUs, Stoliczka," is somewhat similar in form, but 

 its spire is more pointed, and the ornamentation is coarser. 



EripUjcha Humholdti (Muller) f has a relatively higher shell and 

 more numerous spiral grooves than E. pcrampla. 



CEPHALOPODA.: 



NAUTILOIDEA. 



Genus NAUTILUS, Linnteus. 



Nautilus, sp. 

 Plate XLI., fig. 3. Text fig. 1. 



Description. — Shell sub-globose, without umbilicus. Greatest 

 thickness at from one-third to one-fourth of the height of the last 

 whorl. Height of last whorl slightly less than its thickness, except 

 in small specimens. Last whorl indented to about two-fifths of its 

 height. Periphery convex and rounded. Sides convex but slightly 

 flattened, sloping inwards to the umbilical region, where there is 

 a broad, funnel-shaped depression. Siphuncle a little above the 

 centre. Sutures not seen. Surface of shell nearly smooth, bearing 

 fine growth-ridges only, which bend gently forwards in passing from 

 the umbilical region to the sides of the shell, and afterwards curve 

 more rapidly backwards in passing on to the periphery, where they 

 form a broad rounded sinus. 



The approximate dimensions of the largest specimen are : 

 height 110 mm. ; thickness 120 mm. ; diameter 165 mm. 



Bemarhs. — There are two more or less perfect specimens and two 

 fragments of this species. 



It shows some resemblance to N. Dekayi var. montanacnsis , 

 Meek,§ but the whorls are not so thick relatively, and the greatest 

 thickness is not so near the umbilical region. It is also similar to 



* Cret. Fauna S. India, vol. ii. (1868), p. 422, pi. xxvii., fis. 1 ; pi. xxviii., fig. 22. 



f Holzapfel, MoUusk. Aachen. Kieide (Palseontographica, vol. xxxiv., 1888), 

 p. 84, pi. vi., tigs. 19-21. Cossmann, Palasoconch. Comp. , livr. 1 (1895), p. 124, 

 pi. iii., figs. 10, 11. 



+ I gladly take this opportunity of expressing my thanks to Mr. G. C. Crick 

 for assistance in comparing the Pondoland Cephalopods with specimens from 

 Southern India in the British Museum, and for advice on several difficult 

 points. 



S Invert. Cret. and Tert. Foss. U. Missouri (1876), p. 498, pi. x.Kvii., fig. 2. 



