Manchester Memoirs, Vol. Iv. (191 1), No. '^JJ. 7 



One effect of this great development of fleshy sub- 

 stance on the ventral side is that the axis is not central 

 in position, but dorsal to the main mass of the soft 

 structures of which the rachis is composed. 



With reference to this character, a passage in the 

 paper by Moss is noteworthy. He says " lateral ridge- 

 like processes bearing the polypes exist only on one side 

 of the central axis, in short, to borrow a term from its 

 fossil relatives, the Graptolitida, it is monoprionian." We 

 may suppose that Moss's specimen being badly preserved 

 was considerably compressed laterally, and the axis, con- 

 sequentl}', being seen to project on one side, gave the 

 pennatulid a monoprionian appearance. 



V} 



Fig. 3. — Tlie spicules in the superficial layers of 

 the stalk of t^j-A'tJir/Zc?. x i5odianis. 



In a note on the structure of this species by Dr. Blake, 

 which follows Stearns' description (15) there is also a 

 crude figure illustrating this point. 



In a description of a new species of pemiatiilid which 

 he named Pavonaria dofleini^ Moroff (10) gave a figure of 

 a transverse section of the rachis, which is very similar in 

 this respect to that of Osteocella. In writing of the rachis 

 he remarks, " Seine ventrale Seite ist frei und gewolbt." 

 In this respect, and, I believe, in others, Moroff's species 

 is closely related to Osteocella. 



The specimen is a female, clusters of eggs occurring 

 on the mesenteries in the coelenteric canals (Solenia) of 

 the rachis. As in Viroularia there are no ova in the 



