MONOGRAPH OF THE EXISTING CEINOIDS. 679 



Rhahdostyla, sp. Cuenot. Found on the skin and paxillae of the aboral surface 

 of Astropecten aurantiacus (Linnaeus) at Cette. 



Rhabdostyla arenaria Cuenot. Found on the skin of Synapta inhcerens (O. F. 

 Miiller). 



Rhabdostyla., sp. Hamann. Found on the skin of a young Astei'im rubena 

 (Linnaeus) at Kiel. 



Cothurniopsis, sp. Cuenot. Found in the ambulacral grooves of Astropecten 

 ccurantiacus (Linnaeus) at Banyuls-sur-Mer. 



SPOROZOA. 

 Order GREGARINIDA, 



Suborder Monocystidea. 



Syncystis synaptce (Lankester). Found in the ccelome of Synapta inhoerens 

 at Margate and Roscoff. 



Syncystis mulleri (Giard). Found in the ccelome of Synapta digUata (Mon- 

 tagu) at Trieste. 



Syncystis holotfmrioB (Schneider). Found in the ccelome, intestines, and 

 cavities of the arborescent organs in Holothuria tubulosa Gmelin at Nice and 

 Naples. 



Lithocystis schneideri Giard. Found in the ccelomic cavity of Echinocardiwtn 

 cordatum (Pennant), E. flavescens (O. F. Miiller) and Spataiigus purpureus O. F. 

 Miiller from Wimereux, Dunkirk, Concarneau, le Poulignon, and Marseilles. 



FORAMINIFERA. 



Such of the foraminifera as normally attach themselves to foreign objects 

 are occasionally to be found on the columns, and especially on the cirri, of the 

 pentacrinites, and upon the cirri of the comatulids. 



Most of these are of purely fortuitous occurrence and do not merit special 

 mention, but two genera, both belonging to the same family, though widely different 

 in appearance, are very commonly associated with the crinoids. 



Family ROTALIIDiE. 



TRUNCATULINA LOBATULA WALKER AND JACOB. 



P. H. Carpenter states that this species was abundant on the cirri of the 

 comatulids which were obtained by the Dutch Arctic expedition in the Barents 

 and Kara Seas, and Mortensen records it from the cirri of Ilathrometra prolixa 

 from northeastern Greenland. 



Allied species are very often seen upon the cirri and stems of the penta- 

 crinites and upon the cirri of the comatulids from all parts of the world. 

 142140— 21— Bull. 82 ■ 4.5 



