3B2 



Mr. A. Scott on Scolecitlirix hibernica. 



of" characters in which Leucosolenia approaches Sijcon seem to 

 me indubitable proof of their genetic relationship, just as the 

 characters of Ascandra falcata show it to be on quite a 

 different line. The relations of the genera can best be 

 indicated by the graphic method as a genealogical tree : — 



Leucosolenia. 



Ascandra falcata. 



Sycons 

 (such as Sycon raphanus). 



It seems to me an open question, however, whether there 

 may not be amongst the Heteroccela — Sycons or Leucons — 

 forms which are on the Ascetta line and which approach 

 Clathrina or Ascandra in the same way that Sycon raphanus 

 approaches Leucosolenia. 



Oxford, 

 October 1896. 



LIV. — On Scolecithrix hibernica, a new Species of Gopepod, 

 xoith some Remarks on the Distribution of the Crustacea. 

 By Andkew Scott, Fisheries Assistant, University 

 College, Liverpool. 



[Plates XVn. & XVIII.] 



Desci'iption of the Species. — Female. Length, exclusive of 

 caudal setge, 1*2 millim. (^V inch). Body moderately robust; 

 cephalothoracic segment large, nearly as long as the com- 

 bined lengths of the remaining body-segments and abdomen ; 

 last segment of the body produced laterally on each side into 

 spine-like processes. Antennules of moderate length, slender, 



