PISCKS. 
139 
to the dermal ribs of a Pyenodont, the lobate fins and jugular 
plates 6f a PolypteruSj or that combines several of these cha- 
racters. (See also Geolog. Magaz. 1868, vol. v.) 
Polypterus. Dr. Steindachner has made the highly interest- 
ing discovery that certain specimens found by him in the 
Senegal are provided with an external gill, which is lost with 
age. He regards them as belonging to a distinct species, P. la- 
pradei. Wien. Sitzgsber. 1869, lx. pp. 103-108, with two 
plates. [The Recorder considers all the Polypteri known at 
present to be one and the same species.] — This gill is homo- 
logous to the opercular gill of AcApenseVy showing the same 
arterial and venous relations. Hyrtl, ibid. p. 109, with plate. 
ji Acipenser. Prof. Brandt has reexamined the Europseo- Asiatic 
Sturgeons, Melang. Biolog. vii. 1869, pp. 110-116. He dis- 
tinguishes twelve species only, two being new, viz. A. h6erii and 
A. schrenckii, a great part of the forms named by Heck el, Fitz- 
inger, and Dumeril being regarded as nominal species. 
Acipenser dahryanus is a very doubtful species from China, described as 
new by A. Dumeril, Nouv. Arch. Mus. iv. p. 98, pi. 22 ♦. 
Pohjodon gladiiis figured by Dum«SriI, /. c. p. 100, pi. 22. fig. 2. 
CHONDROPTERYGII. 
Curcharias tiyris described as a new species by Atwood, Proc. Dost. Soc. 
Nat. Hist. xii. iSGO, p. 208, Gulf of Mexico. 
'VSdachc maxima. A detailed description and figure of an ex^ple from 
the coast of Portugal is given by M. Capello, under the name of Cetorhinm 
hlainvilUi. Jorn. Ac. Sc. Lisb. no. vii. 1869, p. 2-3.3. 
Leemargus rostratus figured by Capello, Jorn. Acad. Sc. Lisboa, no. vi. 
1869, p. 146, tab. 9. fig. 2. ^ 
Raja. M.jCapello describes and figures a small Ray from Lisbon under 
the name of R. mosaica (Laedp.), Jorn. Ac. Sc. Lisb. no. vi. 1869, p. 1-50, 
tab. 9. fig. 3. Afterwards (ibid. no. vii. 1870, p. 228) it is referred ioR. tin- 
dulata. 
Pteroplutca crehripunctata is described as a new species from Mazatlan by 
Prof. Peters, Monatsber. Berl. Ak. Wiss. 1869, p. 703. 
CYCLOSTOMATA. 
Petromyzon Jluviatilis. On its development, Owsjannikow in Bull. Acad. 
Sc. St. Pdtersb. xiv. pp. 326-329. 
This author dates the establishment of this species from the year 1868, 
adding as reference “ Hist. Nat. Poiss. ii. p. 19-3.’' The book quoted may 
have been in the press at that time ; but to refer in 1869 to a publication 
issued in 1870, as if published in 1869, is a proceeding very unusual in Zoo- 
logical Literature. 
