Mr. C. Mereschkowsky on Californian Diatoms. 518 
171. Fragilaria coccochroma, Mer. San Pedro, rare. [M.] 
See my paper on the Diatoms of the Black Sea. 
172. Fragilaria hyalina (Kiitz.), Grun. San Pedro, rare. 
M. 
173. Fragilaria spicula, Mer.,sp.n. (PI. V. fig.17.) Santa 
Monica, rare. [M.] 
Valve very narrow, lanceolate, with ends acute, length 
about 0°01 mm., strie invisible. Girdle-face very narrow, 
linear-lanceolate, with ends truncate. Forming small colonies 
in zigzag on very short narrow stypes, parasitic on Nitzschia. 
Endochrome composed of two narrow elongated plates asym- 
metrically disposed—one plate nearer to one end of the frustule, 
the second plate to the other end. 
174. Synedra affinis, Kiitz. San Pedro, not rare. [M.] 
175. Synedra affinis, var. parva, Ktitz. San Pedro, some- 
what rare. [M.] 
176. Synedra grandis, Mer. Monterey, common. [M.] 
See my paper on the Diatoms of the Sea of Azof. 
177. Synedra investiens, W. Sm. Santa Monica, on Macro- 
cystis, very common. [M.] 
178. Synedra kamtschatica,Grun. Monterey, common. [M.] 
179. Synedra minuta, Mer. San Pedro, not rare. [M.] 
See my paper on the Diatoms of the Black Sea, parts 1. 
& il. 
180. Synedra nitzschioides, Grun. San Pedro, not common. 
[M.] 
A small form 0°053-0:056 mm. in length. Girdle-face 
quite straight. Endochrome granular. 
181. Synedra undulata (Bail.), Greg. San Pedro, somewhat 
rare. [M.] 
182. Asterionella formosa, Harr. (var.?). Northern Cali- 
fornia. [M.] 
183. Chetoceros californicus, Grun. (fossil?). From Wolle, 
Diat. Amer. pl. lxv. fig. B. 
184. Chetoceros diadema (Khr.),Grun. San Pedro; Northern 
California. [M.] 
185. Chetoceros incurvus, var. angusta, Mer. (PI. V. fig. 23.) 
San Pedro, very rare. [M.] 
Amongst the many endocysts of Ch. tncurvus which I 
