Greville^ on the genus Auliscus. 
49 
forming a narrow^ obovate group^ those radiating to the 
margin straight. Diameter -0045". (Fig. 14.) 
Auliscus radiatus, Bail.? ^ Notes on New Sp. of Mic. 
Organ.^ Smithson. Contrib./ vol. vii); p. 6, fig. 13? 
Hab. In mud, New York harbour, and in the mud of the 
Hudson Uiver at West Point; Eockaway, Long Island, 
U.S.; Prof. Bailey. Fossil at Kaighu's Point, New Jersey; 
New London harbour, U.S. ; dredged. Dr. Lewis. 
The diatom described under this name by Professor Bailey 
is, he says, " a minute species, presenting the characteristic 
mastoid processes of the genus Auliscus, but having no dis- 
tinct umbilicus, and having only slight indications of the 
peculiar curved lines of the preceding species {A, ccelatus). 
His figure is also that of a minute species, and exhibits not 
the very slightest indication of any curved lines at all. It 
will be perceived, from the specimen which I have figured 
from Mr. Kitton^s cabinet, that it is anything but minute ; 
that the lines which converge to the processes are quite evi- 
dent and well-defined, and that there is a remarkably con- 
spicuous border, which does not appear in Bailey^s figure, nor 
is it referred to in his description. Under these circumstances 
I should, perhaps, be justified in regarding our present 
diatom as distinct. Mr. Kitton, however, is decidedly of 
opinion that they form one species, and I therefore leave the 
question undecided until some information be obtained of 
Prof. Bailey^s species. In the event of the one before me 
being ascertained to be truly difi^erent, I wish it to bear the 
name of Baileyi. In Mr. Kitton^s specimens there is no 
distinct umbilicus, but an indefinite space, irregularly filled 
up with puncta. All the lines are composed of a single row 
of minute puncta, the lateral ones not plumose, but straight. 
The border is very striking, being composed of an inner line, 
and the space between it and the margin crossed with rather 
distant striae. It seems scarcely credible that if such a border 
existed in the examples which Prof. Bailey obtained from 
three localities, he should have overlooked it. 
Auliscus punctatus, Bail.- — Valve nearly circular, with sub- 
distinct umbilicus; whole surface more or less punctate, 
but generally so irregularly that it is difficult to trace the 
radiating lines. Diameter -0030". (Figs. 15, 16.) 
Auliscus punctatus. Bail. — ^ Notes on New Sp. of Mic. 
Organ.^ (^ Smithson. Contrib.,^ vol. vii), p. 5, fig. 9. Ralfs, 
in Pritch. Inf., 1861, p. 845. 
Hab. " Often associated with A, pruinosus in the stations 
given for that species,^' Prof. Bailey. Rice-field mud. 
Savannah river, rare ; Dr. Lewis. Patos Island guano ; C. 
Johnson, Esq. Monterey Stone; F. Kitton, Esq. 
