THE MARINE P0L7Z0A OF CANSO, NOVA SCOTIA 



79 



SESSIONAL PAPER No. 22a 



family: lichenoporid^. 



Lichenopora, sp. — I was unable to identify this specimen with any species 

 described by Hincks in 'British Marine Polyzoa.' One small colony was taken off 

 Rhodymenia palmata dredged in 20 fathoms near the entrance to Canso Harbour. 

 The specimen is not more than 2 mm. in diameter. The zoarium is stipitate widen- 

 ing above into a shallow cup. There is a wide bordering lamina entirely free and 

 curved up so as to make the edges of the cup. Zooecia are arranged irregularly with 

 the intervening cavities, also arranged irregularly; many of the orifices have long acu- 

 minate projections, some of which are bifid. The characteristic feature of the speci- 

 men is the form of the zoarium. 



Lichenopora verrucaria (Fabricius). — This is a common species at Canso. I found 

 it on Laminaria fronds washed up on the beach, on a blade of dead Zostera that came 

 up in the dredge from 30 to 40 fathoms and several colonies on Ptilota plumosa dredged 

 from 15 fathoms. 



FAMILY: FLUSTRELLIDJi:. 



Flustrella Jiispida (Fabricius). — This is very commonly found between tide marks 

 ■coating the stems of Ascophyllum nodosum. It is always situated at the base of the 

 stipe. 



FAMILY : VESICULARIID^. 



Bowerbanhia, sp. — Specimens were found growing on hybroids attached to 

 mussel shells taken under wharfs. The zooecia are in groups attached to both sides 

 of a jointed stolon. The polypide has eight tentacles, the stomach is quite dark 

 coloured, the gizzard conspicuous and many cells contain rounded, dark brown 

 bodies. 



Bowerhanhia imhricata (Adams). — A small mass was found growing on the sur- 

 face of Membranipora lineata attached to a mussel shell. The majority of the polypides 

 have a large, red, oval larva in each, and this is the only distinct organ that can be 

 seen. One had its tentacles projecting in a long, pointed mass, they seem to be more 

 than ten, but I could not tell the exact number. I am not at all sure of the identity 

 of this specimen. 



.FAMILY : PEDICELLINID^. 



Pedicellina cernua (Pallas). — Both the smooth and spiny variety of this species 

 occurred on mussel shells taken under wharfs. Variety glabra is the more common, 

 only one specimen of the spiny form was found and the spines on this were long and 

 hair-like, and were not confined to the peduncle, but also cover the polypides. I 

 counted fourteen tentacles in several individuals. 



Pedicellina nutans, Dalyell. — This was found intermingled with Bowerbankia, sp. 

 on a mussel shell got from under a wharf, and also mixed with Pedicellina nutans 

 growing on Membranipora lineata got from a mussel shell. 



Pedicellina gracilis, Sars. — One specimen of this species was found spread over 

 an encrusting mass of Membranipora lineata on a mussel shell, which was got under a 

 wharf, it was intermingled with Pedicellina nutans, and the cells of the two were 

 about the same size. The peduncle was very long and slender, the expanded, cylin- 

 drical part at the base being hardly one-eighth of the whole peduncle, but in a few 

 cases as much as one-fourth. In some individuals the peduncle expands above to 

 form a capitate head which contracts suddenly at the polypide. The polypides are 

 plainly gibbous on the sides. The stolon is jointed. 



