706 PROTOZOOLOGY 



one end dome-like, and the other truncate; macronucleus sausage- 

 shaped; in salt water. 



C. meunieri Powers (Fig. 300, o; 301). Anterior end broadly 

 rounded; posterior region conical; cytostome obscure; oral funnel at 

 anterior end in a depression; broad filiated band at about middle; 

 ectoplasm with concave chromatophore (covered with haemato- 

 chrome) plates on surface, below which numerous pyrenoids occur in 

 vacuoles; endoplasm with numerous granules; 25-42^ by 18-34^; 

 Powers (1932) found that the 'red water' in Frenchman Bay in 

 Maine was caused by the swarming of this organism. The same 

 author held later that this ciliate may be the same as Mesodinium 

 rubrum as observed by Leegaard (1920). 



Bary and Stuckey (1950) found this organism in an extensive area 

 of brownish-maroon water in Wellington Harbour in April and 

 August, 1948. Their description follows: body 22-47/x by 19-41/z; 

 anterior half dome-like, posterior half expanded; posterior end trun- 

 cate; "cytostome"; greenish-maroon chromatophores close to body 

 surface; no ingested food material. 



Family 4 Colepidae Claparede and Lachmann 



Genus Coleps Nitzsch. Body-form constant, barrel-shaped; with 

 regularly arranged ectoplasmic plates; cytostome at anterior end, 

 surrounded by slightly longer cilia; often spinous projections at or 

 near posterior end; 1 or more long caudal cilia, often overlooked; 

 fresh or salt water. Many species (Noland, 1925, 1937; Kahl, 1930). 



C. hirtus (Miiller) (Fig. 302, a). 40-65/x long; 15-20 rows of plate- 

 lets; 3 posterior processes; fresh water. 



C. elongatus Ehrenberg (Fig. 302, b). 40-55ju long; slender; about 

 13 rows (Noland, 1925) or 14-17 rows (Kahl) of platelets; 3 posterior 

 processes; fresh water. 



C. bicuspis Noland (Fig. 302, c). About 55m long; 16 rows of plate- 

 lets; 2 posterior processes; fresh water. 



C. octospinus N. (Fig. 302, d). 80-1 10^ long; 8 posterior spines; 

 about 24 rows of platelets; Geiman (1931) found this organism in an 

 acid marsh pond and noted variation in number and location of ac- 

 cessory spines; fresh water. 



C. spiralis N. (Fig. 302, e). About 23 longitudinal rows of platelets 

 slightly spirally twisted; posterior spines drawn together; a long 

 caudal cilium; about 50/z long; salt water; Florida (Noland, 1937). 



C. heteracanthus N. (Fig. 302, /). Anterior processes only on one 

 side; posterior spines; caudal cilium; about 90/x by 35/x; salt water; 

 Florida. 



