573 
Teredo-bored wood also occurs in the Eolling Downs Series, Mr. G. Sweet having 
obtained such from the Walsh River, and at Hughenden, the borings being from ten to 
fifteen millimetres wide. 
Loo. True Blue Hill, Croydon ( W. Samtoell) . 
Class — Gasteropoda. 
Order— PULMONATA. 
Ramily— SIPHONAEIIDJi:. 
Genus — SIPHONAEIA, G. B. Soioerlv, 1824. 
(Oenera of Shelia i., PI. 143.) 
Siphon AE iA Samwelli, sp. non., PI. 42, fig. 9. 
Sp. Char. Shell patelloid, depressed conical ; anterior margin expanded on the 
left side ; posterior contracted ; apex recurved and much depressed. Surface with a 
large number of radiating costse, not all equal in size, but about twelve stronger than 
the others proceeding direct from the apex ; the intermediate and smaller costas proceed 
from the margin for two-thirds the distance between the latter and the apex, but do not 
reach the last-named ; the whole are crossed by very wavy and sub-imbricating ridges, 
which become more numerous and delicate as the periphery is approached. 
Ols. This shell is known under the condition of impressions of the exterior. 
The unsymmetrical outline suggested to Mr. J. Brazier, who examined the specimens, 
the genus Siphonaria as a more fitting resting-place than Patella. The interior has not 
been observed. 
Of Siphonaria, Mr. G. B. Sowerby remarked : “ Its lateral canal, and the vertex 
being obliquely turned backwards, may be considered as its principal distinctive 
characters, separating it not only from Patella, but from Bmarginula, whose canal is 
anterior and vertex posterior.” 
The nearest fossil ally I have seen is Patella caperata, Tate, from the Ilitenhage 
Series (Jurassic) of South Africa. This is, however, a Siphonaria in all probability, as 
the “ periphery is irregular, and slightly sinuated.” 
The present species is named in compliment to Mr. W. Samwell, late Goldfield 
Warden, who collected extensively at Croydon. 
Loo. True Blue Hill, Croydon {W. SamivelT). 
Order-PECTINIBRANCHIATA. 
Family— NATICID^. 
Genus— NATICA, Adanson, 1757. 
(Hist. Nat. Senegal, Ooquilles, p, 172.) 
Natica taeiabilis, Moore, PI. 31, figs. 2 and 3. 
(For synonymy and description, see p. 485.) 
Loo. Maryborough {The late M. Baintree). Occurs also in the Rolling 
Downs Beds. 
