198 



dcR 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 Placmianomia, 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, wliich 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 

 Australia. By Lovell Reeve, F.L.S. etc. 



(Mollusca, PI. XII.) 



Bulimus Maconelli. Bui. testd acuminato-oblongd, tenuiculd, 

 suhohlique convolutd, spird brevi, suturis rudibus, anfractibus qua- 

 tuor ad quinque, minute et creberrime spiraliter undulato-striatis, 

 ultimo valde inflato, columelld subcontortd, aperturd subampld, 

 labro simplici ; brunned, mactdis 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 Histor}', vnth 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. Westwood, 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 



