485 
Ohs. The body-whorl is more than double the dimensions of the preceding or 
fourth whorl, and proportionally much more globose, and crossed diagonally by delicate 
lines of growth at an angle of 45°. The rather broad sinus occupies the upper 
half of the body-whorl. I find great difficulty in referring this shell specifically to any 
tnow'n British form. It, however, resembles Turbo {Pleiirotomarid) Tunheri, Gt-oldf., 
from the Middle Lias. {T^tJieridffe.') 
The resemblance of this species to a typical Ploiirotomaria is not a marhed one ; 
in fact, it is very much more like those Palfeozoic shells called Jilurcliisonia, w'ith 
rounded whorls. Nor does the word “trochiform” strictly describe its shape; it might 
be better described as conically or elongately turbinate. 
Log. Gordon Downs, near Eoma {The late B. Taintree). 
Bamily— TROCHID^. 
Genus — BELPSINULA, Lamarck, 1804. 
(Ann. Mu 3. Hist. Nat. Paris, iv., p. 108.) 
Delphotila ? BEELECTA, Moove, PI. 29, fig. 12. 
Delphinula refleeta, Moore, Quart. Journ. Geol. Soo., 1870, xxvi., p. 256, t. 10, f. 21. 
Sp. Char. Shell rather small, turbinated ; whorls 3-4 ; spire slightly elevated ; 
Volutions separated by an encircling sinus ; body-whorl much increased ; aperture 
circular, with a thick reflected lip. {Moore.) 
Ohs. The present species is either a very aberrant form of Lelphinula, or it 
cannot be referred to that genus, for it is hardly necessary to observe that neither the 
inner nor the outer lip of Pelphinula is reflected, in the proper sense of the word. 
Log. Wollumbilla {The late Bev. W. B. Clarke). 
Order— PECTIiMBRANCHIATA. 
Family— NATICID^. 
Genus — NATIGA, Adanson, 1757. 
(Hist. Nat. Senegal, Coquil., p. 172.) 
Natica VAEiABiiis, Moore, PI. 31, figs. 2 and 3. 
^atica variahilis, Moore, Quart. Journ. Geol. Soe., 1870, xxvi., p. 256, t. 10, f. 15. 
,, Hneata, Etheridge, Ibid., 1872, xxviii., p. 342, t. 21, f. 1. 
» sp., Hudleston, Geol. Mag., 1^4, i., p. 339, t. 11, f. 4. 
Sp. Char. Shell very thick, broader than high ; spire of 3-4 volutions, somewhat 
depressed ; body-whorl increasing rapidly in size and extended ; aperture ovate ; 
Umbilicus small. {Moore.) 
Ohs. This species is abundant, and I have had an opportunity of examining 
specimens in various conditions. When the body of the shell has been worn, it presents 
o-rugosely striated surface; but in smaller examples, in which the shell is usually better 
preserved, the test is seen to have a comparatively smooth striated exterior. {Moore.) 
It closely resembles N. gaultina, from the Gault of Folkestone and the Green- 
sand of Blackdown. 
The suggestion thrown out by Mr. Etheridge, that his species is probably 
identical with Moore’s previously described one, has been adopted by Prof. R. Tate,* 
has united them. It is the same as Mr. Hudleston’s unnamed shell. Natica 
* Trans. R. Soc. S. Australia, 1886, vii., p. 7.5 ; Proc. Austr. Assoc. Adv. Sci. for 1888 [1889], i., 
P- 130. 
