I 2 



/ '• /VVV $& v >V\.VVV 





nd I -h. til refer to it in what follows ;is Pachycerianthus fitnèriatus l ), while the 



other may be termed /'. monostichus, the 

 specific term referring ti> the arrangement "f 

 the labial tentacles which will 1"- described later. 

 The same arrangemenl is also described by 

 ( i km '\ r \i\i i [909 as occuring in /'. oligopodus. 

 In /'. fimbriatus^ two individuals of 

 which proved to l»- in a most admirable con 

 dition for investigation, the arrangement of the 

 protocnemes was as follows 3 ). The directive 

 mesenteries, like those of other species, were 

 short, sterile and destitute of mesenterial fila- 

 ments. The second and third couples were but 

 little longer than the sterile mesenteries of the 

 deuterocnemic quartettes (see Text-figure II . 

 which they resembled in being provided with 

 mesenterial filaments extensivelj coiled in the 

 lower part of their course. Following von 

 Heider's classification both couples of me 

 teries would be referrcd to the group of Fila- 

 mentsepta, and the only appreciable difference 

 in the two was that the mesenteries of the 

 second couple were slightly longer than those 

 of the third. The fourth couple on the other 

 hand, was formed l>y two mesenteries which 

 wen- fertile and provided with mesenterial 

 filaments that were not extensively coiled, and 

 they alone of all the mesenteries, both protoc- 

 nemes and deuterocnemes, reached tlu: aboral 

 pole. They have. then, all the characters of 

 telocnemes, hut the)- differ from those of C. 

 memöranaceus, etc. in being the fourth couple 

 of protocnemes instead of the second. 



1) 1 name given by Kwietnibwski is ch 

 it had already been emp to, 1 foi a 



which he oamed ./. linia elongata, but which was probably Cerianthus 

 eus. 



2) The two individuals upon which <hi- description is 



in f-. uu. 'lm. and thi ii i onditiou 

 well .Th lier examples, <>f which there were quile 



11 in a mop 

 rated condition. It was p delermine 



in a numbcr of these that the general arran 



identical with that of the formalin exampl 



