116 Prof. F. J. Bell on a new SjJecies o/'Distomum. 



It appears to me that all these characters are quite suffi- 

 cient to justify the separation of Aphanocephalus from the 

 Corylophidte ; and since, for the same reasons, the genus 

 cannot be placed in any other family, it must be regarded as 

 a family distinct in itself, for which I propose the name of 

 Pseudocorylophidas. 



In our present systematic arrangement the true Corylo- 

 phidas seem to occupy a very false position. From the 

 peculiar formation of their antennae, and from their large, 

 elongate, and either entirely free or prominent anterior coxce, 

 as well as from the general arrangement of the parts of the 

 external skeleton of their underside, it is impossible to overlook 

 their close affinity to the 8ilphidge. It therefore appears to 

 me that the most natural arrangement would be to place the 

 Corylophidas immediately before the Silphidee. Many genera 

 present an external appearance so like the Anisotomina, that 

 it is difficult at first to determine whether they do or do not 

 belong to that tribe. In Peldniis and some others the joro- 

 sternitm is reduced to the smallest possible dimensions, as it 

 is in Agathidium^ and leaves the coxal cavities open on both 

 sides. Thus by placing the Corylophidse before the Silphidaj, 

 in proximity to the Anisotomina, a much greater harmony of 

 form and anatomy would be attained than by keeping them 

 in their present position or by removing them elsewhere. 



In the foregoing remarks I refer only to the true Corylo- 

 phidse. Those species which I propose to call Pseudocorylo- 

 phidse I would retain in the position they now occupy near 

 the Coccinellidse. 



Gumley, 

 December 21, 1886. 



XIV. — Description of a new Species o/'Distomura. 

 By F. Jeffrey Bell, M.A. 



During the dissection of Halosaurus macrochir^ Dr. Giinther 

 discovered in the enlarged ends of the ureters three specimens 

 of a fluke which appears to be undescribed. It may be 

 called 



Distomum halosauri. 

 Body smooth, unarmed, much narrower in front than be- 

 hind, widening gradually as it passes backwards, no distinct 



