362 



Mr, A. Scott on Scolecithrlx hibernica. 



of characters in which Leucosolenia approaches Si/con 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 : — 



Ascandra falcata 



Sycons 

 (sucli as Sycon raphanus). 



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

 may not be amongst the Heterocoela — 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. 



LTV. — On Scoleclthrix hibernica, a neto Species of Gopepod^ 

 xcitli some Remarks on the Distribution of the Crustacea. 

 By Andrew Scott, Fisheries Assistant, University 

 College, Liverpool. 



[Plates XVII. & XVm.] 



Description of the Species. — Female. Length, exclusive of 

 caudal set£e, 1-2 millim. {4^ inch). Body moderately robust; 

 cephalothoracic segment large, nearly as long as the com- 

 bined lengths of tlie remaining body-segments and abdomen ; 

 last segment of the body produced laterally on each side into 

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



