MONOGRAPH OF THE EXISTING CKINOIDS. 679 



Rhabdostyla, sp. Cuenot. Found on the skin and paxillse of the aboral surface 

 of Astropecten aurantiacus (Linnteus) at Cette. 



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

 Miiller). 



ffhabdostyla, sp. Hamann. Found on the skin of a young Asterias rubens 

 (Linnaeus) at Kiel. 



Cothurniopsis, sp. Cuenot. Found in the ambulacra! grooves of Astropecten 

 aurantiacus (Linnaeus) at Banyuls-sur-Mer. 



SPOROZOA. 

 Order GREGARINIDA. 



Suborder MONOCYSTIDEA. 



Syncystis synaptce (Lankester). Found in the coelome of Synapta inhcerens 

 at Margate and Eoscoff. 



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

 tagu) at Trieste. 



Syncystis holothurice (Schneider). Found in the coelome, intestines, and 

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

 Naples. 



Lithocystis schneideri Giard. Found in the coelomic cavity of Echinocardium 

 cordatum (Pennant), E. flavescens (O. F. Muller) and Spatangus 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 ROTALIID^E. 



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 Hathrometra 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 45 



