298 Mr. V. .Mcicsclikowsky on Californian Diatoms. 



The double lyre-like figure has been reproduced by O'Meara 

 in an exaggerated way ; it is not nearly so distinct as in his 

 figure, and is not limited by lines, but by two decussating 

 rows a little more distant than the others. 



As to the diatom which has been described by Cleve * 

 under this name, it belongs in all probability to another 

 species, as he does not mention the lyre-like figure; but, on 

 the other hand, he mentions the existence of a double row of 

 puncta between which the median line is enclosed, which 

 means, I suppose^ that these puncta are distinct from the rest, 

 as they are, for instance, in M. (O.) barhadensis^ Grev.t, 

 and which is not the case in M. {0.) Wrightii, these puncta 

 not diflFering from the others. This would explain the 

 remark which Cleve makes at the end of his description, 

 ^^ hen he says, " None of the figures (that of O'Meara in- 

 clusive) corresponds exactly with this species, so that the 

 identification is doubtful." It is evident that this author has 

 had in view some other species than the original M. (0.) 

 Wrightii of O'Meara, or some variety of the latter. 



67. Mastogloia pumila, Grun. San Pedro, not very rare. [M.] 



68. Amphora acuta, var. arcuata, A. S. San Pedro, rare. [M.] 

 Lengtii 0*086, breadth of the frustule 0'068 mm. ; zone 



with 4 longitudinal divisions in 0*01 mm. 



69. Amphora acutiuscula, Kiitz. Laguna near San Pedro, 



common. [M.] 



70. Amphora angusta (Greg.), CI. San Pedro, rather rare. 



[M.] 



71. Amphora angusta, var. ventricosa, Greg. [C] 



72. Amphora coffaeiformis, Ag. San Pedro, common. [M.] 



73. Amphora costata, W. Sm. San Pedro, not common. [M.] 



74. Amphora hyalina, Kiitz. San Pedro, rare. [M.] 



75. Amphora lineolata, Ehr. San Pedro, common. [C, M.] 



76. Amphora marina, W. Sm. Monterey, rare. [M. 



77. Amphora ostrearia, Breb. San Pedro, common. [M-] 



78. Amphora proteus, Greg. Northern California, rare. [M.] 



79. Amphiprora alata, Kiitz. Santa Monica, brackish, very 



coniuion. [C, ^1.] 

 Endrochrome composed of two plates disposed transversely, 

 leaving in the centre a circular hyaline space. 



80. Amphiprora paludosa, W. Sm. San Pedro. [M.] 



• Cleve, ' Synopsis of the Naviculoid Diatoms,' part ii, p, liS. 

 t ' Diatomeentafeln zusannn. f. ein. Fr.' pi. Iv. fig. 10. 



