591 
ZOOLOGICAL LI T li 11 AT U lUi; . 
MOLLUSOOIDA 
BY 
E. Perceval Wright, M.A., M.D., P.L.S. 
Allman, G. J. On Rhabdopleura, a new form of Polyzoa, 
from deep-sea dredging in Shetland. Quart. Journ. Mic. 
• Science, 1869, pp. 57-63, plate 8. 
This interesting new form is not only generically distinct 
from all previously known forms, but is in many respects so 
peculiar as to render it necessary to regard it as the representa- 
tive of a still more general section of the class Polyzoa (see 
p. 597.) 
Kirchenpauer, — . Neue Bryozoen. Catalog IV. of the Mu- 
seum Godeffroy, Hamburg, May 1869, pp. xxv, xxxiv, 
Krohn, a. Ueber die Fortpllanzungsverhaltnisse bei den Bo- 
trylliden. Archiv f. Naturg. xxxv. 1. Band, pp. 190-196. 
. Ueber die friiheste Bildung der Botryllusstocke. Ar- 
chiv f. Naturg. xxxv. 1. Bd. pp. 326-333, Taf. xiv. 
Kuppper, C. Die Stammverwandtschaft zwischen Ascidien und 
Wirbelthieren. Schultze^s Archiv f. mikrosk. Anatomic, 
Bd. V. 1869, pp. 459-463.- 
A brief letter to the editor of the Archiv, corroborating the 
important discovery of Kowalevsky. The author investigated 
the development of Phallusia caninaj a different species from 
any investigated by Kowalevsky. In treating of the chorda, he 
says that it consists of a double row of four-sided cells, sur- 
rounded by the still oval muscle-cells, and projecting a little into 
the body portion, so that its long axis would penetrate between 
the nervous cavity and the alimentary canal. One cannot ima- 
gine, he says, a more beautiful model of a vertebrate embryo. 
On the convex side, above the axis, there is the nerve-canal ; 
on the concave side, under the axis, there is the visceral canal ; 
the contrast of dorsal and ventral is as clear as possible. 
Metschnikow, El. Entwickelungsgeschichtliche Beitrage. 
Bull, de PAcad. Imp. d. Sc. St. Petersbourg, t. xiii. no. 3, 
1868, pp. 283-300. 
In these notes the development of many of the invertebrata is 
described ; in no. 7 we have Ueber die Larven und Knospen 
von BotrylluSj^ and no. 8 Embryonalentwickclimg der ein- 
