144, ZOOPHYTOLOGY. 
first: four are vittate; and the seventh, though distinctly a 
Catenicella, and closely allied to C. aurita (Busk), simulates 
to a certain extent the structure of the remarkable genus 
Calpidium. 
in this genus, notwithstanding the numerous additions to 
it, Mr. Busk’s original subdivisions retain their natural in- 
tegrity. C. alata fraternises with the typical Fenestratze. 
Busk’s specimen of C. aurita must have been poor. <A good 
example differs so much from the Fenestrate group, and so 
closely approaches C. geminata, which could not possibly be 
associated with them, that it has been deemed advisable to 
put the two species provisionally at the end of the list, thus 
indicating the tendency of C. geminata towards the structure 
of the next genus. 
C. Harveyi stands alone a representative of the ‘ Fas- 
ciate.” The position of the ovicell is very characteristic. 
The new “ Vittate” are all normal. In this group there 
are two modifications of the ovicell: in the greater number 
it is galeriform and superior, encroaching on the cavity of the 
cell above it, which is sessile, by a broad base on the ovicelli- 
gerous one. ‘Two, C. ¢taurina and C. perforata, have a globu- 
lar vesicle sessile on the older cell of a geminate pair. 
a.—Catenicelie@ fenestrata, Busk. 
. C. lorica, Busk. 
. C. ventricosa, Busk. 
. C. hastata, Busk. 
. C. cribraria, Busk. 
. C. alata, n. sp. 
ore co tS 
Cells pyriform. Fenestre 5—7. 
Irregular grooves pass inwards from the fenestrae, giving the space within 
a somewhat granular appearance. Lateral processes enormous, consisting 
of a large hollow conical ascending process, with a pyriform opening in 
front, a nearly tubular ‘“‘avicularian chamber” passing outwards opposite 
the upper third of the cell-mouth, and ending in a minute avicularium; and 
a wide hollow friuge continued down to the base of the cell, and iregularly 
perforated in front. Ovicell (?). 
The specimen figured is somewhat smaller and more 
delicate than usual. The ccencecium does not appear to 
attain a great size. All the specimens in the collection are 
parasitical on other Polyzoa, and on red Algee. Old speci- 
mens have often lost their large ascending processes, which 
gives them a very different appearance. 
Bass’s Strait; Dr. Harvey. Port Fairy; J. Dawson, Esq. 
6. C. plagiostoma, Busk. 
7. C.margaritacea, Busk. a 
