XAUTILTD^. 
241 
Nautilus (Hercoglossa) Portlandicus, Foord and 
Ct. C. Crick. 
18W, Xaufilus Portlandicus, Foord and G. C. Crick, Ann. Mag. Nat. 
ser. 6, vol. v. p. 397, f. 3. 
Fig. 58. 
yautilus Portlandicus. — a, lateral view, showing two. of the septa and the 
siphuncle, which projects a little ; b, peripheral view. Drawn from a 
.specimen in the British Museum (No. 62165). About one sixth natural 
size. 
Char. “ Shell subglobose, narrowly rounded on the periphery, 
gently rounded on the sides, widest immediately above the umbi- 
licus ; the latter probably closed, or, if open, exceedingly small. 
Body-chamber forming probably half a volution. Aperture wider 
than high. Septa approximate, the sutures forming a very distinct 
sigmoidal curve on the sides of the shell; in pas.sing over the peri- 
phery the sutures are slightly bent backwards. The siphuncle is 
nearly central. The test is not preserved. 
Remarks. “ The large specimen (No. 62165) 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 74 inches.” 
{Foord and, G. C. Criclc.) 
PART 7T. R 
