80 DUBLIN UNIVERSITY 



C. Harreyi stands alone a representative of the "Fasciatse ;" the po- 

 sition of the ovicell is very characteristic. 



The new "Vittatso" 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 ovicelligerous one. Two, C. taurina and C. per- 

 forata, have a globular vesicle sessile on the older cell of a geminate pair. 



a. — CATENICELLiE FENESTRATE (Bush). 



1. — C. lortca (Bush). 

 A single fragment; Bass's Strait; Dr. Harvey. 



2. C. ventricosa {Bush). 



Abundant, Bass's Strait, Yan Diemen's Land; Dr. Harvey. Port 

 Fairy ; James Dawson, Esq. 



3 C. hastata (Bush). 



Bass's Strait ; Dr. Harvey. JSTew Zealand, abundant ; Dr. JolifTe. 



4. — C. crilraria (Bush). 



One or two close short tufts, Bass's Strait ; Dr. Harvey. Improbable 

 as it may at first sight appear, I have some suspicion that this may be 

 a stunted variety of the last. The extreme forms are very distinct, but 

 I have a singular series of intermediate specimens. 



5 C. alata, n. 8. Plate VI., Fig. 4. 



Cells pyriform. Fenestra 5-7. 



Irregular grooves pass inwards from the fenestra, giving the 

 space within a somewhat granular appearance. Lateral processes enor- 

 mous, 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 end- 

 ing in a minute avicularium ; and a wide hollow fringe continued down 

 to the base of the cell, and irregularly perforated in front. Ovicell (?). 



The specimen figured is somewhat smaller and more delicate than 

 usual. The coenoecium does not appear to attain a great size. All the 

 specimens in the collection are parasitical on other Polyzoa, and on red 



