GULF OF MEXICO 



253 



fl932) found it in Lylechinus variegaliis and Erhinometrus 

 lacunter. 



24. Anophrys aglycus Powers, 1935. 



Powers (1935) found this ciliate present in the intestines 

 of all species of sea urchins living near the tide line in 

 Tortugas though not abundant in any of them. Trip- 

 neustes exculentun collected near the reef was the best 

 e.xample of infestation with this form. 



25. "Form M" Powers, 1935. 



In the intestines of the sea urchins Trypneustes e.inilenius 

 and Lytechiniis variegaliis in Tortugas. Powers (1935) 

 noted that this form was similar both to Cohnilembus 

 caeci Powers, 1935 (see below), and Anophrys vermiformis 

 Powers, 1933, the latter common to Lylechinus variegatus 

 at Beaufort, North Carolina. It is listed provisionally 

 here with the Entorhipidiidae simply for the sake of con- 

 venience; there is no implication that the writer holds an 

 opinion as to its ta.xonomic position. 



Suborder 4 Hymenostomata Hickson 1903 

 Family FRONTONIIDAE Kahl 



26. Frontonia schaefferi Bullington, 1939. 



Discovered by Bullington (1939a, 1940) in a pool at 

 East Key, Tortugas. 



27. Frontonia ocularis Bullington, 1939. 

 In Tortugas. 



28. Uronema marina Dujardin. 



Observed by Pearse (1932) in Pool 5 on Garden Key, 

 Tortugas. 



29. Uronema pleuricaudatum Noland, 1937. 

 Discovered by Noland (1937) in cultures at Bass 



Biological Laboratory, Englewood, Florida. 



Family OPHRYOGLENIDAE Kent 



30. Ophryogtena frontonia Bullington, 1940. 



Found by Bullington (1930) in a pool on East Key and 

 later (1939) in cultures from the moat around Fort 

 Jefferson on Garden Key, Tortugas. 



31. Pteuronema setigerum Calkins, 1902. 



Originally discovered at Woods Hole, Massachusetts, 

 this species was found by Noland (1937) in the vicinity of 

 Englewood, Florida. 



32. Pteuronema coronatum Kent. 



Observed by Noland (1937) in the vicinity of Engle- 

 wood, Florida. 



33. Pteuronema marinum Dujardin, 1841. 



Observed by Noland (1937) in the vicinity of Engle- 

 wood, Florida. 



34. Cyclidium rhabdotectum Powers, 1935. 



In Tortugas found in the sea urchins Centrechinus 

 antiltarum, Echinometra tucunter, Tripneustes esculentus 

 and Ctypeaster rosaceus, being rare in the last host species. 

 Powers (1935) considered it quite likely that this species 

 is the one which Jacobs (1912) designated as form "A." 



35. Histobalantidium semisetatnm Noland, 1937. 



Discovered by Noland (1937) in the vicinity of Engle- 

 wood, Florida. 



Family COHNILEMBIDAE Kahl 



36. Cohnitembus caeci Powers, 1935. 



Powers (1935) who discovered the species at Tortugas 

 remarked that C. caeci, commonly found in any of the 

 littoral echinoids, has a marked predilection for Trip- 

 neustes esculentus. 



Suborder 5 Thigmotricha Chatton and 

 Lwoff 1926 



Family HYSTEROCINETIDAE Diesing 



37. Hyslerocinela pontodrilus Wichterman, 1942. 



In intestines of Pontodrilus bermudensis Beddard, a 

 littoral oligochaete in the vicitiity of Loggerhead Key, 

 Tortugas (Wichterman 1942). 



Order 2 SPIROTRICHA Biitschli 1889 

 Suborder 1 Heterotricha Stein 1859 



Family METOPIDAE Kahl 



1. Metopus brevicristatus Powers, 1935. 



Limited to the intestines of the sea urchin Clypeaster 

 rosaceus in Tortugas. This ciliate seems to be the one 

 designated by Powers (1933) in a preliminary note as 

 form "G." 



2. Metopus histophagus Powers, 1935. 



Observed only in intestines of the sea urchin, Clypeaster 

 subdepressus, in Tortugas. 



3. Metopus rotundus Lucas, 1934. 



Known only from the intestines of the sea urchin, 

 Centrechinus antillarum. Originally described from Ber- 

 muda, this ciliate was reported from Tortugas by Powers 

 (1935). 



According to Powers (1935, p. 302), "Lucas (1934) re- 

 ports this form as the sole infestant of three specimens of 

 Centrechinus antillarum from Bermuda. At Tortugas, M. 

 rotundas was always found in company with other ciliates." 

 In a preliminary note by Powers (1933) this ciliate ap- 

 parently was designated as form "J." 



4. Metopus circumlabens Biggar, 1932. 



This species has been found in the intestines of various 

 sea urchins in Bermuda and Tortugas. Observed in Cen- 

 trechinus antillarum and Echinometra tucunter by Jacobs 

 (1912), Biggar (1932), Lucas (1934), and Powers (1935); 

 in Lytechinus variegatus by both Jacobs and Powers; in 

 Tripneustes esculentus by Powers (1935); rarely in Cly- 

 peaster rosaceus and C. siibdeprcssus by Powers. 



Family SPIROSTOMIDAE Kent 



5. Gruberia lanceolatum (Gruber 1884). 



This free-living ciliate is widely distributed, having been 

 observed by Bullington (1940) not only at Tortugas but 

 also at Cold Spring Harbor, Long Island, and Beaufort, 

 North Carolina. 



