198 
de in the following particulars: 1. That the line which indicates the 
junction of the two edges of the sinus which forms the perforation, 
instead of being placed on the side of the ridge which supports the 
cartilage, is placed at a considerable distance from it; 2. The sides 
of the sinus are firmly soldered together, leaving only a circular hole ; 
3. The support of the cartilage, instead of being merely a ridge or 
process, here forms a large elongated subtriangular talus, like that 
found in the genus Ostrea; 4. It differs greatly in the number and 
form of the muscular scars ; the two large ones in the free valves are 
placed as in the genus Placunanomia, and there is a third anterior 
one in each valve not found in any genus of the family, and very un- 
like the third scar of the genus Anomia. I know only of a single 
specimen of the genus, which is in the collection of Mr. Cuming, 
who believes that it came from California. It may be called Tedi- 
nia pernoides; subquadrangular, reddish, subsquamose, obscurely 
radiated, internally reddish brown. 
2. DESCRIPTION OF A NEW SPECIES OF BULIMUS FROM 
AvustrratisA. By Lovett Reeve, F.L.S. etc. 
(Mollusca, Pl. XII.) 
Butimus Maconetur. Bul. testdé acuminato-oblongd, tenuiculd, 
suboblique convolutd, spird brevi, suturis rudibus, anfractibus qua- 
tuor ad quinque, minute et creberrimé spiraliter undulato-striatis, 
ultimo valde inflato, columelld subcontortd, aperturd subampld, 
labro simplici ; brunned, maculis parvis punctisque nigris undique 
pictd et seriatim fasciatd, maculis infra suturas regularibus, aper- 
ture fauce fuscescente. 
Hab. Brisbane, Moreton Bay, Australia. 
This fine species has been forwarded to me from the Manchester 
Museum of Natural History, with the above name attached to it in 
manuscript, by Captain Brown. It is chiefly remarkable on account 
of its absolute similarity in texture, in colour, and in pattern, to Helix 
Falconari of the same locality. It appears to differ in nothing but 
in that difference of convolution which characterizes the respective 
genera. Mr. Cuming possesses an exactly similar un-umbilicated 
specimen ; and none of several examples of H. Falconari, with which 
it has been compared and which are all largely umbilicated, present 
any indication of an intermediate form. It is the first instance on 
record of a strictly typical richly painted Bulimus and Helix agreeing 
in colour, in pattern, and in all respects save that of form. 
3. OBSERVATIONS ON THE DENTITION OF THE TIGER BEETLES. 
By J. O. Westwoop, Pres. E.S., F.L.S. etc. 
Mr. Westwood directed the attention of the meeting to the neces- 
sity which existed of a more precise examination and description of 
the diversity in the dentition of the mandibles of insects, especially 
