31 



don microtrema and Dicynodon (Tropidostoma) dunni. As pointed 

 out by Lydekker, these belong to the one species, D. microtrema, 

 and other specimens in the British Museum show that it differs 

 from Dicynodon in the structure of the parietal region and in 

 having molars very similar to those of Pristerodon, but fewer in 

 number. This species is therefore placed in a distinct genus, for 

 which the name Tropidostoma must be accepted. 



Mrs. H. L. M. Pixell-Goodrich, B.Sc, contributed a paper 

 entitled " Minchinia : a Haplosporidian," dealing with the life- 

 history of Minchinia chitonis (Lankester), a protozoan parasite of 

 the Mollusc Chiton. Hitherto this parasite has been considered 

 to belong to the Coccidia, but convincing evidence is herebrougbt 

 forward to show that it is a Haplosporidian. An account is 

 given of the multiplication in the host by plasmotomy and sporo- 

 gony, and a detailed description of the development of the very 

 cbaracteristic spores. 



The next Meeting of the Society for Scientific Business will be 

 held on Tuesday, May 25th, 1915, at half-past Five o'clock p.m., 

 when the following communications will be made : — 



EXHIBITIONS AND NOTICES. 

 R. I. Pocock, F.R.S., F.L.S., F.Z.S. 



(a) Exhibition of pieces of Wild Boar skin. 



(6) Exhibition showing evolution of Porcupines' quills. 



PAPERS. 



Stanley Hirst, F.Z.S. 



On a Bloocl-sucking Gamasid Mite parasitic on Couper's 

 Snake. 



G. A. Boulenger, F.R.S., F.Z.S. 



A List of the Snakes of Madagascar, Comoro, Mascarenes, 

 and Seychelles. 



P. Chalmers Mitchell. M.A., D.Sc, F.R.S., F.Z.S. 



Anatomical Notes on the Gruiform Birds Aramus giganteas 

 Bonap. and Rhinochetus kagu. 



