Miscellaneous. 4.49 
operated upon to take air at the surface of the water, they neither 
presented in their movements nor in their mode of life any apparent 
modification, the cutaneous respiration replacing the branchial.— 
Comptes Rendus, August 5, 1867, pp. 242-246. 
Note on my former Communication on a supposed New Species of 
Planarian Worm. 
To the Editors of the Annals and Magazine of Natural History. 
GENTLEMEN,—In the October Number of the ‘ Annals’ I drew your 
attention to what I believed to be an undescribed species of a Rhab- 
doceel Planarian worm, which I proposed to call Typhloplana nigra. 
Living as I do in the country, I am in a great measure dependent on 
my own library for books of reference. Since writing to you, I have 
procured a copy of Oscar Schmidt’s work ‘ Die Rhabdocoelen Stru- 
delwiirmer,’ and on Taf. 4. fig. 10 I find an excellent figure of my 
Planaria, which appears to be not a Typhloplana, but a Mesostomum, 
and the M. personatum discovered by Schmidt. From what Dr. 
Schmidt says, it appears that the adult animal is possessed of eyes, 
which, however, are concealed in the black pigment ; young indivi- 
duals just emerging from the egg have two distinct eye-specks. The 
chief difference between the genera Mesostomum and Typhloplana is 
the absence of eyes in the latter. Hence, as I could discover none 
in the specimens I examined, I referred the creature to the genus 
Typhloplana. It is, however, clearly identical with the Mesostomum 
personatum of Schmidt, and I cancel my former conjecture, and add 
this species of Rhabdoccel planaria to the British fauna. Hab. Reedy 
pond near Preston. 
I remain, Gentlemen, 
Yours sincerely, 
Preston Rectory, Wellington, Salop. W. Hovexron. 
Nov. 15, 1867. 
On the Development of Sepiola. By E. Mecznixow. 
(Notice by E. Claparéde.) 
As M. Mecznikow’s memoir is published in Russian, we give a 
rather detailed notice of it. 3 
Besides the old writings of Bohadsch and Delle Chiaje, we possess 
on the development of the Cephalopoda an unsatisfactory memoir by 
M. Van Beneden, and a more important work by M. Kolliker. The 
latter, although more complete, still leaves some gaps to be filled up. 
The ova of the Sepiole, investigated at Naples by the author, 
resemble the eggs of the common fowl in their form, although not 
in their size (they are only 4 millims. in length); they are con- 
tained to the number of fifteen together in a colourless mucilage. 
Each ovum is furnished only with a single envelope; this chorion 
does not appear to correspond with the outer membrane of the ova 
with double envelopes of other Cephalopoda (Sepia, Squids), but 
rather to their inner envelope, which M. Kolliker and others have 
regarded as the vitelline membrane. This latter denomination seems 
