CALOCYLI^'DIiUS. 59 



C. MINUTUS. (Ealfs), Kirch. {Peniimi minutum, Cleve). Plate 

 XV, fig. 12. Plate V, figs. 19, 20. 

 Cylindrical, 4-6 times as long as broad, slightly constricted 

 in the middle, ends rounded, membrane smooth. 

 Diameter 11-16 ij. 



Florida, Sonth Carolina, (Bailey), Rhode Island, (Olney). 



This minute and apparently variable plant has not come to 

 my notice. It is classed by diflferent authors both as a Penium 

 and a Dooidium. 



C. CucURBiTA, (Breb.), Kirch. (Cosmarium Oucurbita, Breb.) 

 Plate XV, fig. 14. 

 Cells punctate, cylindrical, about twice as long as broad, 

 slightly constricted at the middle, rounded at the ends. 

 Diameter 22-25 yu. 



Pennsylvania and New Jersey. 



C. CUETXJS, (Breb.), Kirch. {Gosmca-ium curtum, Breb.). Plate 

 XV, figs. 15, 16. 

 Cells somewhat fusiform cylindrical, about twice as long 

 as wide, slightly constricted at the middle, the ends sub- 

 conically rounded, cytioderm smooth. 

 Diameter 20-32 /a. 



Pennsylvania, New Jersey, and other States. 

 Fig. 16 represents a small form collected several succeeding 

 Summers, in gelatinous masses on the muddy bottom of a 

 small i50ol ; thousands were present ; the other (fig. 15) is the 

 larger, typical form. 



€. CoEDANUM, Breb. Plate XLIX, fig. 28. 



Diameter about half the length ; gentle and slightly con- 

 stricted in the middle ; ends round or somewhat truncate ; 

 cytioderm lightly granular or punctate. End view circular. 

 Diameter 26-27 /u- ; length 47-50 ju- ; isthmus 17-19 /x. 



This form is reported by W. B. Turner, as found in Nova 

 Scotia. 



C. CONNATUS, (Breb.), Kirch. {^Cosnuirium connatum, Breb.) 

 Plate XV, figs. 8, 9. 

 Cells short and thick, subcylindrical, about one and one- 

 half to two times longer than broad, ends broadly rounded ; 

 constriction forms a wide, shallow sinus ; cytioderm dis- 

 tinctly punctate. 

 Diameter 45-75 fx. 



Pennsylvania, New Jersey, Florida, New York, Vermont, 

 Minnesota, etc. ; probably distributed everywhere. 



