Manchester Memoirs, Vol. lix. (191 5), No. 1, 7 



Spicules of the internal part of the stalk are not so 

 abundantly, present as one would infer from Kiikenthal's 

 description of his specimens of Actinoptilum moile. It may, 

 however, here be noted that the expression " stielinnern " 

 leaves a large margin from which the spicules may be 

 taken. The spicules of the outer cortex of the stalk are 

 oval plates sometimes biscuit-shaped of variable size. 

 They are in many respects similar to those described 

 from this part by Kiikenthal but appear to differ slightly 

 in their superficial markings. The spicules of the cortex 

 of the rachis and calyx are very numerous. They are of 

 the flanged or ridged type described by Kiikenthal as 

 " dreifliigelig." The presence of minute corpuscular 

 spicules arranged in eight longitudinal lines on the body 

 wall of the autozooids and also the occurrence of these 

 lining corpuscles on the tentacles are points distinguish- 

 ing the specimens from typical examples of Actinoptilum 

 molle as described by Kiikenthal. The length of these 

 minute spicules ranges from about 0*023 to 0*03 1 mm. 



Actinoptilum molle, Kiikenthal, var. intermedium. 



Pieter Faure, No. 14,617. Four white specimens from 

 this locality are of particular interest as they appear in 

 some degree to afford a transition between the genera 

 Actinoptilum and Echinoptilum. 



The more important characters of these specimens 

 are as follows : — 



A trace of a ventral groove on the rachis, otherwise 

 little trace of a bilateral arrangemeut of the autozooids ; 

 autozooids arranged in transverse and longitudinal rows ; 

 the spicules of the rachis are mainly " dreifliigelig " ; there 

 is no axis ; the lateral teeth of the calyces of the auto- 

 zooids are not very prominent ; no spicules in the antho- 

 codiae ; the siphonozooids have rudimentary calyces. 



