^fr. C. Mereschkowsky on CaUfnrnian Diatoinn, 507 



tliree uiiclulations, upper end bent in a hook as in Gr. anga- 

 losd. 



142. Giammatophora costata, Mer., sp. n. (PI. V. figs, lo, 

 IG.) i\l(iiiteicy, very rare. [M.] 



Valve somewliat broad, perfectly linear, with broadly 

 rounded apices; structure composed of costas 8'5 to 9 in 

 0"01 mm. ; intercostal sj^aces with a double row of small but 

 distinct puncta formin;,^ decussating rows, pseudoraphe rather 

 indistinct. Length 0'0417-005ti5 mm., breadth of the valve 

 0-0115-0-013o mm.; diameter of the openings 0-0076- 

 0-013 mm. 



I have seen only three valves of this species, which has 

 the same structure of the valves as in Achnanthes longipes or 

 Diploneis SinitJiit. The septa, as can easily be seen from 

 fig. 16, form more than one undulation (probably two or 

 three) ; the openings of the septa are quadrangular, in small 

 specimens they are rounded. 



143. Grammatopliora decussata, ]\Ier. Monterey, very rare. 

 [M.] 



For the description of this species see my paper " On Poly- 

 nesian Diatoms." 



14:4. Grammatopliora marina, var. communis, Grun. Sau 

 Pedro, Redondo, common ; Monterey, not rare. [M.] 



145. Grammatopliora marina, var. hawaiensis, Mer. Mon- 

 terey, rare. [M.] 



Length 0"065 mm., breadth of the girdle-face 0*024 mm., 

 diameter of openings O'OOGo mm. Described and figured in 

 " Polynesian Diatoms." 



14G. Grammatophora marina, var. macilenta, W. Sm. San 

 Pedro. [M.] 



147. Grammatophora maxima. Gran. San Pedro, very rare. 

 [M.] 



This might be the G. robusta, Dippel. I do not understaiul 

 the difference existing between the latter and G. )na.cinui. 



There are a number of other species and varieties of 

 Grammatophora to be found in California, which, however, 

 require further examination and a careful comparison with 

 similar forms from otiicr localities. 



148. Plagiogramma californicum, Grev. San Pedro, very 

 rare; Calif, guano. [Gv., M.] 



Occurs in Californian guano. Plagiogramma {yirequale, 

 Greville, seems to me to be the same as this species. 



3')* 



