New Genera and Species of Biatomacem. Bij M. F. Petit. 245 
2. C. Crux (Ehr.), ‘ Monatsberichten/ p. 265. 
Lyell’s Bay. PI. XIV., Fig. 4. 
3. Camjjyloneis Grevillii (\Vm. Sm.). 
Since tlie creation of the genus by Herr Grrunow, he has dis- 
covered that G. Grevillii consists of two valves; the inferior is 
composed of two superimposed plates of silica, of which no drawing 
has previously been given. Fig. a represents a complete frustule ; 
Fig. d, the superior valve ; h and c, the two plates of silica com- 
posing the inferior valve. 
4. Navicula decussata ? Ehr. ‘ Bericht. Berl. Akad.’ p. 364. 
Length 30 to 39 ya, breadth 7 ya 7. 
Lyell’s Bay. PL XIV., Fig. 11. 
This species with crossed striae has not been previously figured ; 
I therefore doubtfully refer the present form to this species. 
Nevertheless all the characters correspond with those given by 
Ehrenberg. 
5. N. Kennedy i (Wm. Sm.), var. P constricta. 
Foveaux Strait. PL XIV., Fig. 13. 
This form has probably not been figured ; it is chiefly remark- 
able on account of its occurrence with a species essentially elliptical, 
clearly showing that the contraction of the margins is of no value 
as a specific distinction. 
6. N. Smithii (Breb.), var. ^ minor (P. Petit), n. var. 
This variety is distinguished by its broadly rounded ends, and 
its finely punctate striae. Length 33 ya, breadth 19 ya 8, costae 15 
to 16 in 15 fjb. 
Lyell’s Bay. PI. XIV., Fig. 14. 
7. Grammatophora marina (Lyng., n. var. (P. Petit). 
This variety differs from the type, by the lines of the diaphragms 
being more bent. 
Foveaux Strait. PI. XY., Fig. 20. 
New Biatoms from Honduras. By Herr Grunow. 
‘ Monthly Microscopical Journal^ October 1, 1877. 
Errata. — Pl, CXCIII., for 11 a 6 c cl, read 10 ah c d-, for 10 a 6 c, read 11 a 6 c. 
