1881.] PROF. F. J. BELL ON A NEW SPECIES OF MESPILIA. 

 PSEUDOBOLETIA INDIANA. 



433 



ECHINOSTREPHUS. 



For the present it is not possible to do more than give the accom- 

 panying table of measurements ; when any change is made in the 

 position of this curious genus, it should be based on a fuller know- 

 ledge of its life-history than we at present possess. In the mean- 

 time, in its unusual form it stands alone, not only among the 

 Echinometridae, but among all the Echinidse. The smallest speci- 

 men measured (which is also smaller than any measured by Prof. 

 Alex. Agassiz) would seem to show that there is, during the rather 

 earlier stages, a considerable diminution in the proportional values 

 of the abactinal and actinal areas. 



ECHINOSTREPHUS MOLARE. 



3. Description of a New Species of the Genus Mespilia. 

 By F. Jeffrey Bell, M.A., F.Z.S. 



[Received February 24, 1881.] 



When, last year, I was engaged in naming and revising the 

 specimens of Temnopleuridse in the British Museum, I was unable 

 to satisfy myself as to the exact specific nature of the specimen now 

 to be described, and which I propose to name after its discoverer. 



Mespilia whitmei, n. sp. 



The examination of this species revives nearly all the difficulties 

 as to the definition of the genera Mespilia and Jmb/ijptieustes, The 



