.')12 Mr. C. Meresclikowsky on Cahfornian Diatoms. 



the Calitornian form differs from the latter by its greater 

 size, attaining O'l mm., usually 0-07-0'085 mm. (the type 

 varies from 0-035-0 088 mm., average of thirty-three cases 

 0054 mm.), and by the endochrome, which is always com- 

 posed of numerous moderately elongate elliptic granules, 

 while in the Mediterranean form they are usually very elon- 

 gate, bacilliform, and not numerous. I give no name to 

 this variety, as it requires further examination. 



165. Licmophora Thiimii, Mer. (PI. V. fig. 7.) Monterey, 

 common. [M-] 



Valve of medium breadth, strongly clavate, slightly ar- 

 cuate and asymmetrical, rarely symmetrical; upper part 

 inflated, attenuated towards the superior apex, which is broad, 

 truncate, abruptly attenuated at the superior quarter, be- 

 coming narrow and almost linear, inferior apex slightly 

 inflated. Pseudoraphe broad, very disti'.ict; striaj 16-17 in 

 0"01 mm., at the lower end as well as in the middle. Girdle- 

 face cuneate, with rather thick outlines, upper angles sub- 

 acute. Septa deep (average 0016 mm.) , slightly arcuate, thin 

 below the septal puncta, thick above them. Length 0'098- 

 0-188 mm., breadth of the valve 001 15-0-0180 mm. 



It is to Mr. Ed. Thum of Leipzig, the celebrated mounter 

 of diatoms, who on many occasions assisted me in my studies, 

 that I dedicate this species. It has no close relation to any 

 other. 



166. Eunotogramma, sp.? (PI. V. figs. 24-27.) San Pedro, 

 rare; Hawaii, rare. [M.] 



I give the figures of a species of Eunotogramma which I 

 have met many times, and which, for lack of necessary books, 

 I am unable to determine. The strite are sometimes fine, 

 invisible with an ordinary raagnifying-power (figs. 26, 27), 

 sometimes distinct (figs. 24, 25), about 9 or 10 in O'Ol ram. 

 Length 00175-0023 mm,, breadtli of the girdle-face 0"011- 

 0-013 mm., breadth of the valve about 0007-0-008 mm. 



167. Raphoneis amphiceros, var. rhomMca, Grun. San Pedro, 

 rare. [M.] 



168. Opephora pacifica (Grun.), Petit. San Pedro, Mon- 



tu-ey, common. [M.] 



169. Clavicula recens, Mer. Northern California, very rare. 



^^•^ 

 See my paper " On Polynesian Diatoms," chapter iv. 



170. rra|;ilaria (striatula, var. ?) californica, Grun. [G.] 



