302 Mr. O. Thomas on the 



posterior pararadial (Clark's " anal x ") prevents the upward 

 migration of the anal (Clark's " radianal ") and inhibits its 

 further growth, partly by drawing on its stereom for its own 

 supply of calcium carbonate. 



We may, therefore, continue to regard the anal in the 

 Promachocrinidae as homologous with that of the other 

 comatulid larvae, and, in all, as the representative of anal as. 



XXXLV. — On the Arrangement of the small Tenrecidae 

 hitherto referred to Oryzorictes and Microgale. By Old- 

 field Thomas. 



(Published by permission of the Trustees of the British Museum.) 



There has long been some doubt as to the distinction from 

 each other of the two genera Oryzorictes and Microgale, the 

 latter of which I described in 1882, twelve years after 

 Grandidier had described the former, and in consequence of 

 this doubt the generic allocations used by Forsyth Major in 

 describing the many new forms of Tenrec-shrews which he 

 discovered during his successful expedition of 1894-96 have 

 never been revised or confirmed. 



I have now had an opportunity of going over the Museum 

 material of the group with a view to putting its generic 

 arrangement more in order than it was left by Dr. Major, 

 who never completed the admirable work he began on it. 

 No additional specimens have been received since his 

 collection came, but the fine series he obtained, combined 

 with those previously collected by Mr. Deans Cowan and 

 worked out by me, have enabled me to obtain some idea of 

 the natural arrangement of the group. 



I find that it may be divided into five genera, whose chief 

 characteristics are set out in the following synopsis : — 



A. Claws not markedly fossorial, the anterior 



not or little longer than the posterior. 



Canines not dominant, commonly low and 



bifid, and never surpassing the anterior 



incisors. 

 a. Molars with marked internal lobe. In- 

 cisors diminishing backwards, the canine 

 considerably longer than P. Muzzle 

 little elongated, the teeth touching each 

 other. Fore-claws not longer than 

 bind. 



