COSMARIUM. *7 



C. quadrifarium, Lund. Plate XVII, figs. 16, 17, 18. 



About one-fourth longer than broad, deeply constricted, 

 sinus narrow linear; Bemicells, semicircular; inferior angles 

 nearly right; margin composed of 17 emarginate-truncate 

 verrucae; within the margin a similar series; basal tumor 

 orbicular, furnished with 12-17 larger granules; viewed from 

 the vertex, elliptic, with a granulated tumor on the middle of 

 each side, and four Beries of granules extending from end to 

 end ; lateral view has a granulated swelling on each side and 

 four granules on the end terminating four series. Two chlo- 

 rophyllous nuclei in each semicell. 

 Diameter 33-36 ,".: length 10-44, 



Frequent in ponds, Mt. Everett, Ma-- 



C. K.ii:i.i.m\mi, Will.'. Plate XLIX. figs. 1!', 20, 21. 



Nearly equal in length and breadth, deeply constricted in 

 the middle, sinus linear with month considerably ampliated ; 

 Bemicells cordiform, sides Dearly Btraight, or low convex ; 

 apex truncate with four or six light crenulations ; the sides each 

 with six indentation- ; granules arranged in radiating Lines, 

 none in the centre, but a basal tumor has five vertical series of 

 granule.- ; observed from the vertex the Bemicells are narrow 

 elliptic, with a tumor on each side. 

 Diameter 20-25 . 



Wood Lake, Sussex County, New Jersey. 



C. Blyttii, Wille. Plate XIX. figs. 31, 32, ;.;. 



Small, somewhat longer than broad; Bemicells subreniform, 

 apex truncate with tour crenulations; Bides erose-crenate 

 (crenae three); semicells within the margin, granulate, gran- 

 nies arranged in two series of aboul fourteen and nine; in 

 centre a small prominence. Lateral view circular with a papilla 

 on each side; end view elliptic, with a prominence or papilla 

 on each side. 



Diameter 14-15 u. Length 1718 ,".. 



Waters of Sussex County. X. J. Long Wood pond, Wood 

 Lake. 



C. speciosum, Lund. Plate XIX, rigs. 7, 8, 9; 14, 15. 



Cells about one and one-half times longer than wide ; 

 elliptic-oblong, constriction forms a narrow linear sinus ; 

 semicells with sides slightly convex, but moderately converg- 



