1888-89.] Mr John Rattray on the Genus Coscinodiscus. 603 
G. minutus. Kiitz. ( Bacil ., p. 131, pi. i. fig. 14). — Diara. 
•0125 mm. Central space and rosette absent. Markings minute, 
punctiform, without order. Border stride punctate. This species,, 
which Ralfs admits ( Pritcli . Inf., p. 831), and which was founded 
on specimens procured in mud from the river Elbe at Cuxhaven by 
Sonder, belongs to Gydotdla , and is probably Gy. salina , Gran. 
(Van Heurck, Syn. Diat. Belg ., pi. xcii. fig. 11), as found in the 
Thames at Greenwich. Schumann’s G. minutus ( Schrift . Phys. Oek. 
Ges. Konigsb ., 1867, p. 62, pi. iii. fig. 71) is distinct, though it 
too belongs to Gyclotella. 
G. sinensis: O’Me., Quart. Jour. Micr. Sci., 1879, p. 122.— 
Diam. ’3575 mm. Central space stellate, because of the different 
lengths of the rows of markings. Markings close, distinctly larger 
towards the border. 
This species, procured by H.M.S. Challenger in Hong Kong 
Harbour, is problematical. O’Meara has so named, with a query, 
fossil valves from Los Angelos and Mejillones now in the British 
Museum, but the specimens to which his “finder” numbers 
refer belong to G. gigas, Ehrb. The original may have been G. 
diorama Sch. ( Atl ., pi. lxiv. fig. 2), or G. mirificus , Cstr. 
{Diat. Ghall. Exjped ., p. 154, pi. iii. fig. 6), also from Hong Kong 
Harbour. 
C.Smitliii. O’Me., Proc. Roy. Ir. Acad., 1875, p. 262. — This is 
G. minor, W. Sm., not Ehrb. {Syn. Brit. Diat., i. p. 23, pi. iii. 
fig. 36), and is identical with Melosira nivalis, W. Sm. {ibid., ii. 
p. 58, pi. liii. fig. 336), with which it must be united, though 
approaching M. distans, Kiitz., from Bilin. O’Meara, whilst 
pointing out the inaccuracy of Smith’s specific name minor, and 
replacing it by that of Smithii . continues the error with respect to 
the genus. 
G. striatus, Kiitz. {Bacil., p. 131, pi. i. fig. 8), is Gyclotella 
striata, var. intermedia , Grun. (Van Heurck, Syn. Diat. Belg., 
pi. xcii. fig. 10), not Gy. striata, as stated by Van Heurck {ibid., 
pi. xcii. fig. 6). Gy. dallasiana, W. Sm., now preserved in Smith’s 
collection in the British Museum, shows no clear band between the 
central areolate portion and the radially striated band at the border, 
it is thus also identical with C. striata, var. intermedia, Grun., 
with which also agrees Cose, striatus, Ehrb. (Jan. and Raben., in 
