100 ON THE DEVELOPMENT OF ASCARIS NIGROVENOSA. 
diversity of individual forms.* All these parts arise in 
exactly the same way, by budding, and when incompletely 
developed are indistinguishable from each other. The germ- 
capsules arise from animal-cells, whose tentacular apparatus 
and alimentary organs are aborted. The embryonic develop- 
ment of the Bryozoa, is, speaking generally, very diverse, 
since it may be effected not only by fertilized ova and stato- 
blasts, but occasionally: also as in Lepralia, by gemmules 
springing singly from the inner wall of the animal-cells, or of 
the ovicells. The formation of the rest of the contents of the 
cell (the digestive and respiratory apparatus, the sexual 
organs, and the statoblasts) also takes place, according to 
M. Smitt, by gemmation, so that he is disposed to assign to 
the Bryozoa (Polyzoa) a double polymorphism, an external 
and an internal, the former having reference to the cells and 
the latter to the viscera, which also may be more or less in- 
dividualised, as has already been pointed out by Allman.” 
In the paper of which the above is a summary, the author’ 
investigations were conducted in Crisia aculeata,.Alcyonidium 
gelatinosum, A. parasiticum, Flustrella hispida, Citea truncata, 
Eucratea chelata, Scrupocellaria scruposa, Canda reptans, 
Flustra truncata, Fl. membranacea, and several species of 
Membranipora and Lepralia. 
In the memoir whose title heads this notice, M. Smitt 
describes a new species of Gitea in the following terms :— 
CE. argillacea, u. sp. 
(HK. elongata, recta, punctata, basi constricta. 
_ Hab. In mari Bahusiensi, nullo alio loco, ut videtur, ad- 
hue reperta; per Modiolam oculine, affixam serpens myenta 
est. (Mus. Holm. Lovén). 
Species Citez ligulate (Busk), maxime affinis, a qua tamen 
facilé basi sua constricta dignoscitur. Longitudo teste 
erecte circ. 1°55 mm., cujus dimidiam partem superiorem, 
tenet apertra testz obliqua. 
On the DevELopMENT of ASCARIS NIGROVENOSA. 
In our last number we gave a notice of some late researches 
on the development of Ascaris nigrovenosa,t+ by Herr E. C. 
Mecznikow, who at the same time claimed to be the original 
* Tn this class, all the six forms of cells (so termed) are certainly, not 
unfrequently, co-existent in the same polyzoary.—G. B. 
+ ‘Quart. Journ. Mic. Sci.,’ Jan., 1866, p. 25. 
