166 MESSRS. W. WEST AND G. 8. WEST ON 
Bot. xxxv. (1897) p. 121, t. 367. f. 8, in the narrower apices of 
the semicells, the different vertical view, aud the triangular 
scrobiculations, which are differently arranged. 
40. CosMARIUM PUNCTULATUM, Bréb. in Mém. Soc. Sc. Nat. 
Cherb. iv. (1856) p. 129, t. 1. f. 16. 
Var. DEPRESSUM, W. B. Turn. in Vet.-Akad. Handl, xxv. 
(1893) n. 5, p. 54, t. 8. f. 16. 
Forma minor. Long. 175 p; lat. 15:5 u; lat. isthm. 44; 
crass. &5 p. 
41. C. rRAcHYPOLUM, n. sp. (Pl. 8. figs. 14, 15.) 
C. parvum, circiter 13plo longius quam latius, leviter con- 
strictum, sinu lato aperto ; semicellule rotundato-ovate, apicibus 
levissime truncatis, parte superiore semicellularum sparse minu- 
tissime granulatà; a vertice vise circulares. 
Long. 29-30 p ; lat. 16-17 u; lat. isthm. 11:5-13 p. 
Compare with C. sparsipunctatum (syn. Disphinctium sparsi- 
punctatum, Schmidle, in Oesterr. bot. Zeitschr. xlv. (1895) p- 348, 
t. 15. ff. 1-6). 
42. C. sUBGLOBOSUM, JVordst. Alg. sandvic. p. 14, t. 1. f. 18. 
Forma MINOR. 
Long. 24 u; lat. 15-5 u5; lat. isthm. 14 u. 
43. C. CONNAaTUM, Bréb. in Ralfs, Brit. Desm. p. 108, t. 17. 
f. 10. 
Long. 69 u; lat. 52 p; lat. isthm. 44 p. 
44. C. Cucurerra, Bréb. (Ralfs, Brit. Desm. p. 108, t. 17-£.7): 
Long. 32 p; lat. 15 u; lat. isthm. 19:5 p- 
STAURASTRUM, Meyen. 
45. S. DECORATUM, n. sp. (PL 9. fig. 7.) 
1 e . " 1 
S. parvum, 1 4plo longius quam latius, profunde constrictum, S00 
angusto-lineari extremo subampliato; semicellule pyramidato- 
trapeziformes, angulis inferioribus superioribus rotundatis, later 
bus retusis supra medium, apicibus leviter retusis ; zonis latis 
granulorum altera trans partem basalem, altera trans partem 
apicalem, granulis in seriebus verticalibus ordinatis; a vert 
