ATLAS DER DIATOMACEEN EUNDE. 
59 
vmhilicata^ do. var. hicimeata, N, Samoensis, N. prohalis, iV. 
hexapla. 
Oil plates 51-55 are figures of some of the most beautiful of 
the genus Campylodiscus, most of which are correctly delineated. 
We especially call attention to the following on Plate 51, and 
which we believe are considered by the authors to be new species and 
varieties (it would be advantageous if the new species were indi- 
cated by n.sp.): — 1. C. tceniutus (this is very near G. stellatus, 
Grev.). 2. C. oruatus, Grev., var. amphileia, Grunow. 3. Do. 
var. mesoleia. 4. J)o. var. 5. (7, a large and beautiful 
species. 
Plate 52 — Figs. 1-2 represent a very beautiful var. of C. 
exinuus, Grev., var. Briocensis, Grunow ; 8 , C. bifurcatus is 
remarkable for its pseudo median line, the ends of which become 
forked as they approach the margin. 
C. Phalangium (figs. 16-17, pi. 53) closely resembles Greville’s 
C. ambiguus. C. Rotula (fig. 20) might also be referred to the 
same author’s C. Brownei. C. Balearicus is perhaps only a 
variety of C. biangulatus, Greville. 
In some samples of the Yarra-Yarra deposits may be found a 
very beautiful form of this genus ; it is somewhat variable in its 
markings, and in some instances would seem to be a connecting link 
between C. clypeus and C. echeneis. Herr Grunow names this 
form C. Dcemelianus, and two very excellent delineations are given. 
The figures of C. clypeus are very good. C. echeneis is well 
represented in f. 5, but the valvular views are perhaps the worst 
in the part, being too much like flat discs. 
Several figures are given (PI. 55) of C. noricussradi C. hibernicus. 
To the latter Grunow (and I think rightly) refei's C. costatus of 
the- Synopsis, and which he considers distinct from C. noricus. 
On plate 56 are given 26 figures of species of Surirella. Fig. 
1, S. Neumeyeri, Janish = Plagiodiscus,* Neum., is probably only 
a distorted Surirella. Surirella contorta, Kitton, is well repre- 
sented by fig. 4. Many figures are given of forms belonging to the 
S. fastuosa group. Figures 15 and 16 represent a supposed new 
species S. cruciata, but it is probably only a form of S. striatula, 
with some of the costae abnormally developed. I have occasionally 
seen it in some of the Breydon gatherings. Campylodiscus 
spiralis, Sm., is correctly referred to Surirella, in which genus 
Kiitzing originally placed it. 
A scale of ’001 of an inch and *01 of a mm., enlarged to 660 
diameters, would be a useful addition to the plates. 
F. Kitton. 
* See figures of this genus, M. M. J., Oct. 1, 1877, pi. cxciv., figures 8 
and 9. 
