310 T. A. STEPHENSON 



This may he the same as Pseudoparactis, in which 

 case it takes priority. But it seems distinguished hy its single 

 sphincter, and distinct fro)n A.m iiiophi lactis in its lack 

 of suckers. 



6. Verrill says Stum [) h i a may have fertile perfect mesen- 

 teries,, perfect mesenteries 16-24 pairs in large specimens. 



7. Antiparactis, Verr., is probably a synonym of 

 Paranthus. 



(iii) Other details. 



1. E up belli a, Pax, 190H, p. 475. 



Diadumenidae with definite base. Wall may be wrinkled. No papillae 

 or suckers. Distinctly divided into sea pus and capituhiin, the scapus 

 with an easily-shed investment. No acrorhagi or fosse. J>ong strong 

 mesogloeal sphincter. Six pairs of macrocnemes. Acontia not specially 

 strong. There are cinclides in longitudinal rows. 



E. cinclidifera. Pax, 1908, p. 475. 



The definition of Diadumenidae Avill need slight alteration of 

 detail to admit this form. It seems to be, if it really has 

 cinclides, a link between Diadumenidae and Phelliidae, a 

 Diadumenid on the way to becoming a Phellia. 



2. Pax describes a Paraphellia polyptycha (1908, 

 p. 493), which may be a P a r a p h e 1 1 i a or possibly a 8 a g a r - 

 tiomorphe. 



3. A n d V a k i a is of quite uncertain standing and more needs 

 to be knowai of it. 



4. Allantactis seems to be the same as Sagartio- 

 morphe, and if this is so the name has priority. 



5. Octineon, Moseley, M. S. (See Fowler, ' Quart. Journ. 



Micr. Sci.', vol. 35, 1894, p. 461.) r = Ammodiscus, Carp., 



1871, p. 159.) 



The body has the form of a thin disc a Uttle raised in the middle, and 

 encrusted with sand and other things which may get into the mesogloea. 

 Sphincter seemingly mesogloeal. Probably twelve tentacles. Twelve 

 larger primary and perfect mesenteries, but only the eight Edwardsia 

 mesenteries provided with true retractors. Very few of the mesenteries 

 beyond the twelve primaries perfect, and these are thin, with no gonad 

 or filament and little muscle. Of the two couples of primaries over and 

 above the Edwardsia eight, one couple has a modified kind of muscula- 



