496 Miscellaneous. 
It is superfluous to say that the scales at the bottom of the Plates 
are, for the same reason, useless. 
I take this opportunity to make a few remarks concerning some 
of the species mentioned in the same papers :— 
Nitzschia spiralis, Mer. (Ann. & Mag. Nat. Hist. vol. vil. p. 475). 
—This name having already been given to another species, must be 
changed, and I propose to call it N. contorta, Mer. 
Tropidoneis eligans (W. Sm.), Cl. (1. ¢. p. 299), is by mistake said 
to have two chromatophore-plates. It has four plates, as all marine 
species, with the exception of 7’. vitrea, which has only two. : 
Climacosphenia pacifica, Mer. (1. c. p. 508), is the same as 
CQ. elongata, Bail., at least it does not differ from the figure of that 
species given by Peragallo (Diat. mar.d. France, pl. Ixxxvi. figs. 1-2); 
the former name has therefore to be dropped. 
Licmophora Monks, Mer. (1. c. p. 510), being named after a 
lady, has to be changed into L. Monksie. 
Rhabdonema sp. ? (1. c. p. 505. n. 136) is most probably &. Cro- 
zeerit (Ehr.), Grun. 
Bidduly hia simplex, Mer. (1. c. p. 516), should be compared with 
the species figured by A. Schmidt, ‘ Atlas,’ pl. exli. figs. 9-11; the 
latter is, however, different from B. simplex, not having the 
characteristic biarcuate lines. B. simple is also very nearly allied 
to B. pellucida, Castrac. (Diat. Challeng. pl. xxvi. fig. 5), of which it 
may be a variety. 
Biddulphia Baileyi, W. Sm. (1. c. p. 516), to be replaced by 
B. mobiliensis. According to Boyer both are identical (other authors 
distinguish them). The genuine B. mobiliensis is not rare in the 
plankton of San Pedro (Calif.). 
Navicula (Libellus) hamulifera (1. c. p. 294), N. (Schizonema) 
avenacea (p. 293), and Surirella fastuosa yar. lata (p. 480) had better 
be excluded from the list. 
Asteromphalus malleus, var. pacifica, Mer. (Ann. & Mag. Nat. Hist. 
vol. vi. p. 487).—When I described this variety I was not in posses- 
sion of A. Schmidt’s ‘ Atlas.’ Having it now, I see (Atl. pl. xxxviil. 
fig. 3) that this form has already been described by Brébisson under 
the name of A. arachie. As this latter was described first, the 
species of Wallich should be called var. mallea. Schmidt’s fig. 4 
in plate xxxvili. and fig. 27 in plate exxxvii. do not, however, 
resemble A. arachne, differing by the rays being broader and a 
little inflated at the ends; this is never the case in A. arachne, of 
which I have observed quite a number of specimens. It should be 
distinguished as var. gazelle, Mer. 
Skeletonema costatum, var. spiralis, Mer. (1. c. p. 485), has been 
figured, but neither described nor named, by A. Schmidt, ‘ Atlas,’ 
pl. elxxx. figs. 36-37. 
