232 
NAUTILOIDEA. 
phery ; these are crossed by close-set longitudinal lines, more distinct 
in the young shell. 
RemarTcs. “ The chief distinguishing character of this species is 
the subangular border of the umbilicus. In this last feature, and 
also in the wide and semilunate section of the whorl, this species 
resembles Nautilus excavatus ^ ; but the latter has a much larger 
umbilicus and closer septa. It may also be compared with N. Mal- 
herhi^ Terquem ^ ; but the latter is at once distinguished by its less 
globose form and much larger umbilicus. 
“ The type of this species (iS’o. C. 747) is in the ‘ Win. Smirh 
Collection ; ’ hence the specific name. There is a fine example 
from Sherborne, Dorsetshire, in the Woodwardian Museum, Cam- 
bridge, in which the test is beautifully preserved. Two smaller 
ones in the same Museum are from Halfway House, Dorsetshire, 
and one shows the sculpture of the young shell perfectly.” {Foord 
and G. C. Crick.) 
Horizon. Inferior Oolite. 
Localities. Burton-Bradstock, Halfway House, Bradford-Abbas, 
Dorsetshire. Two specimens in the British Museum (Xos. C. 747 
and C. 3095) are without localities, but arc undoubtedly British. 
Well represented in the Collection. 
Nautilus BurtonensiS) Foord and G. C. Crick. 
1890. Nautilus Burtonensis, Foord and G. C. Crick, Ann. & Mag. 
Nat. Hist. ser. 6, a"o1. v. p. 288, f. 17. 
Bp. Char. “ Shell subglobose, compressed on the sides and peri- 
phery, the latter at first narrow and considerably flattened, but in 
the later stages of growth becoming wider and more rounded. The 
umbilicus is very large in proportion to the shell-diameter, its 
greatest width being 1| inches, while that of the shell is about 
5 inches ; it is moderately deep and exposes all the inner whorls ; 
the sides slope steeply, and the outer border is subangular. The 
test, which is admirably' preserved, is thick, and its surface is 
marked only with fine lines of growth, which make a deep sinus 
upon the periphery (see fig. 54, h). The septa are rather wide 
apart ; the sutures slightly sinuous on the sides of the shell and 
forming a slight sinus on the periphery. In a young shell (2| 
^ J. de C. Sowerby, Miu. Conch, vol. vi. p 55, pi. dxxix. fig. 1. 
^ Mem. Soc. Geol. France, ser. ii. vol. v. pt. ii. 1855, p. 243, pi. xii. figs. 5, 
5 a. 5 h. 
