TWO NEW BRITISH NEMERTEANS. 547 



On Two New British Nemerteans. 



B.y 



R. C. Piiiiuett, B.A. 



With Plates 39 and 40. 



The two new species of Heteronemerteans described below 

 each form a new geuiis. Both were found at Plymouth. The 

 first, Micrella rufa, was found by myself whilst digging 

 in the mud of the river Yealm at low water mark. Amongst 

 other forms dug up at the same time may be mentioned 

 Carinella superba, Nemertes echiuoderma, together 

 with species of Synapta, Nephthys, Solen, and Capitel- 

 lidae. For two preserved examples of the second form I am 

 indebted to the kindness of Mr. W. I. Beaumont, who dis- 

 covered it among some dredge material from near the 

 Mewstone, and with whose name 1 have much pleasure iu 

 associating it. As will appear below, it has seemed advisable 

 to create a new genus to receive it. Consequently its full name 

 appears as Oxypolia beauniontiana. A third and larger 

 example has recently been sent to me alive from the same 

 locality. By means of it I have been able to confirm the obser- 

 vations Mr. Beaumont made upon his specimens when alive. 



Micrella rufa belongs to the family of the Lineidse, 

 Oxypolia beaumontiaua to that of the Eupoliidae. 



Fam. LiNBiD^. 



Micrella, nov. gen. 



Body elongated, slender and dorso-ventrally flattened pos- 

 teriorly. No side folds present. Caudal appendage present. 



