Mr. C. Mereschkowsky on Californian Diatoms. 505 
observations, pointing out that some, but not all, are to be 
looked upon as the traces of rudimentary hairs. For instance, 
Dr. A. Fjelstrup, of Copenhagen (Zool. Anz. xi. p. 14, 1888), 
writes as follows :—“ Bei den meisten in Midvag get6 Iteten 
Globiocephalen zeigte die Haut, zumal in der Unter- und 
Oberkieferregion, eine Menge kreisférmiger Porenfiguren, in 
Grosse und Anordnung individuell sehr verschieden. Die 
Kreise haben meistens einen Diameter von *5—1 cm., einzelne 
bis tiber 1-5 em. Die Anzahl der Poren in jedem Kreise variirt 
der Grésse gemiiss von etwa 20-50; ihr Diameter ist durch- 
schnittlich -16 mm. Hs finden sich sowohl unvollstindige, 
sich schneidende oder beinahe concentrische Kreise als verein- 
zelte Poren.” The general description of these structures, 
their size, the manner in which the circles intersect or overlap, 
their irregular arrangement, in various parts and on some 
individuals only, and the further statement that no sign of 
them is visible in the foetus, all incline me to think that here 
also we have to do with scars left by a cuttlefish. Similar 
structures have evidently been observed in Globiocephalus by 
Bennett, quoted by Eschricht and again by Fyelstrup :— 
“On the head, and chiefly around the lips, the skin is marked 
with many scattered circles, each the size of a sixpence, and 
composed of a single row of small depressed dots, which 
would appear to mark a disposition to the formation of 
vibrisse or whiskers.” I need hardly repeat that I do not 
agree with this interpretation of their cause. 
LXV.—A List of Californian Diatoms. 
By C. MERESCHKOWSKY. 
{Concluded from p, 480. | 
133. Campylodiscus Thuretii, Bréb. San Pedro, Monterey, 
not rare. [M.] 
134. Striatella unipunctata, Agardh. San Pedro, Monterey, 
not rare. [M.] 
135. Rhabdonema lineare, Mer. Common in Northern Cali- 
fornia ; Monterey, rare; San Pedro, very rare. [M.] 
This species has been described and figured in my paper 
“On Polynesian Diatoms”’ (see chapter iv.). 
136. Rhabdonema, sp.? (Pl. V. figs. 21, 22.) Northern 
California, rather rare. [M. } 
Valve linear-rhombie or rhombic, strongly gibbous in the 
Ann. & Mag. N. Hist. Ser. 7. Vol, vii. 35 
