292 THE FKESH-WATER ALGiE OF NORTH YORKSHIRE. 



circulare Hass. M. — E. Jenneri Archer. St. — E. pectinatum Breb. 

 ]\X., C. — E. gemmatum Kg. M. — E. incavatum Josh, et Nord. M. 

 This interesting species was quite typical, as figured by Joshua in 

 Jouru. Bot., Feb. 1885. — E. rostratum Ralfs. C. — E, elegam Breb. 

 C, IsL—E. crassicolle Lund. M. — E. binale Ralfs. S., M. — Var. 

 insulare Wittr. M. — Var. elobatum Lund. C, M. — E. venustum 

 Breb. M. 



Cosmarium quadratum Ralfs. C, M. — C. plicaUan Reinsch. 

 S., M. — C. Hammeri Reinsch. Sc. — C. 'Nymannianum Grun. S. 

 — C. homalodermum Nord. M., C, S., Reeth. — C. anceps Lund. 

 M., C. — C. granatiim Breb. M. — C. Ciicumis Corda. M., Sc, 

 Moorcock Inn. — C. circulare Reinsch. M. This is not in Cooke's 

 ' British Desmids,' though it is to be found in Mr. Roy's paper on 

 Perthshire Desmids in the * Scottish Naturalist ' for April, 1877. — • 

 C. Ralfsii Breb. M. — C. pyramidatum Breb. M., S., C. — C. gale- 

 ritum Nord. S., M. — C. pseudomtiduhim Nord. M. — C. nitidulum 

 De Not. M. — C. subtumidiim Nord. C. — C. Phaseoliis Breb. St. 

 — C. Gotlandicum Wittr. M. — C. bioculatum Breb. M., St., Sc, S. 

 — C. tinctum Ralfs. M., St., S, — C. pygmaum Archer. M. — C. 

 Meneghimi Breb. C, M. — C. obliquum Nord. M. — C. Iceve Rabh., 

 var. septentrionale "Wille. M., Sc, C, Cotterdale. — C. crenatum 

 Ralfs. S., M. — C. Holmiense Lund. M. — C. undulatum Corda. 

 M., St. — C. tetragonum Nag. M. 



C. granulatum. n. sp. Frond large, somewhat elliptic, about 

 one-half longer than broad, constriction deep and narrow, semicells 

 suborbicular ; vertical view elliptic-oblong, side view of seniicell 

 broadly oval. Membrane minutely granular. Length 125 /x; 

 breadth 85 /x ; isthmus 25 (x, C. Very sparingly seen. Fig. 4. 



C. eboracense, n. sp. Frond rather large, about one-half 

 longer than broad, elliptic-oblong, constriction deep and narrow, 

 semicells roundly pyramidal ; vertical view broadly elliptic, side 

 view of semicell roundly oval. Membrane minutely granular in a 

 radiate and concentric manner. Length 100-110 /x ; breadth 

 63-68 /x; isthmus 20-22 /x. C. This was observed many times 

 during the examination of a large quantity of material. Fig. 1. 



C. tetraophthahnum Breb. Frequent. — C. Brehissonii Meneg. 

 M., C, St., S. — C. ovale Ralfs. S., St. — C. conspersum Ralfs. 

 M., S. — C. latum Breb. M. — C. quaternarium Wittr. et Nord. 0. 

 — C. viargariti/erum Meneg. M., C, Cotterdale. — C. Logiense Biss. 

 M., S. — C. punctulatum Breb. St., C, Sc, Moorcock, Cotterdale. 

 — C. botrytis Meneg. Common. — C. pramorsum Breb. M., C, Sc. 

 —C. Broomei Thw. S., M. — C. ochthodes Nord. M., Sc, C, S., 

 Cotterdale. — C. Boecldi Wille. M. — C. sphalerostichmn Nord. et 

 Wittr. M.. C. 



C. lepidum, n. sp. Frond small, subquadrangular, scarcely 

 as long as broad, constriction deep, sinus linear, apical angles 

 faintly produced; vertical view elliptic, side view of semicell circular. 

 Membrane having transverse rows of granules (giving a crenulate 

 appearance to the whole margin). Length 16-17-5 p; breadth 

 17-18-5 p ; isthmus 6-5-7 p, M. Only a few examples of thig 

 were seen. Fig. 14. 



