Mr. C. Meresclikowsky on CaUjbrnian Diatoms. 509 



apex, which is broad and rounded* ; niartrins straight, superior 

 apex broadly rounded. Pseudoniphe indefinite; strine very 

 fine, not less than 24-25 in 01 mm. Girdle-face narrow, 

 cunoate, with rather delicate margins, upper angles rounded. 

 Septa suj)erlicMaI, very thin, straight, septal puncta small, 

 strongly marginal. Endochrome granular. Length 0'031- 

 0-041 mm., breadth of the girdle-face 0-0077-0-0125 mm., 

 breadth of the valve 0010-0011 mm. 



This variety differs from the type species, into which it 

 gradually passes, by its broader valves and the more delicate 

 appearance of the frustule. The breadth of the valves of 

 L. chihia is about 00(>9 mm., sometimes only 0'006 mm. 

 (and even 00053 mm.), while here they are never below 

 001 mm., and their form is somewhat different, being more 

 ovoid. 



l.")8. Licmophoraflabellata (Carm.), Agardh. Common. [M,] 

 159. Licinophora flabellata, var. parva, .Mer. (PI. V. 



figs. lL'-14.) San Pedro, not rare; Monterey, very 



common. [M,] 



I have quite a numb r of slides containing L. flabellata 

 from the Black Sea, the Adriatic, the Mediterranean, the 

 Calitbrnian coast, &c., in which this species, although 

 greatly v;irying in size, is never represented by specimens 

 below 0'117 mm., varying from 0"117 to 0*437 mm. In one 

 gathering from Monterey, however, I found in great number 

 a small form varying from 0*064 to 0'146 mm., usually being 

 about 0075-0' I mm., in which larger individuals are very 

 scarce, and this same form frequently occurs also in several 

 gatherings from San Pedro and in one from Sumatra. These 

 facts prove undoubtedly that such forms cannot be considered 

 merely as small-sized individuals of L. Jlubellala, but rather 

 represent a separate variety, peculiar as it seems to the Pacific 

 and Indian Oceans. 



The form of the valve, in the smaller specimens at least, 

 is also somewhat different and the girdle-face is broader 

 and more cuneate. I give here a series of individual 

 measurements : — 

 Length: (>W4 0068 0-0<38 0072 0082 083 0090 



Breadth of the friist.: 020 002o 0031 x 0019 0024 0"^027 

 0094 0098 q-100 0127 0146 

 021 0020 00.J1 x' 0020' 

 Breadth of the valve 0-007-0-008 mm. 



• Fijr. 10 haa been represented by the engraver as bein^ slij^htly asym- 

 metrical, whicli is not the case. The upper niarpin of tig. 11 oug-fit to be 

 straitrht. 



