78 MARINE AND FISHERIES 



6-7 EDWARD VII., A. 1907 



are translucent; the zooecia are rather less regular in shape but are arranged in regular 

 lines. 



Porella concinna (Busk). — One specimen was got from a stone taken by the trawler 

 Active. The wall is thickly punctured, the cells are not distinctly divided, the cell- 

 wall is much raised about the orifice ; the avicularia are generally present on the lower 



lip. 



Escharoides rosacea (Busk). — A single specimen 5 -6 mm. high divided into two 

 lobes was taken by the trawler Active in about 30 to 50 fathoms; it was attached to a 

 stone. 



Mucronella sp. — The specimen was found on an ascidian taken by the trawler Active. 

 It resembles closely M. coccinea. It is an encrusting form; the zooecia are ovoid, nar- 

 rowing below, quite flat, the outline of each is very distinct, the surface plainly granu- 

 lar; the orifice is almost terminal, it is rounded above and widest near the base; there 

 are two lateral denticles near the base and a median, blunt denticle on the lower lip; 

 two avicularia are present at the sides of the orifice, their lower edge is below the edge 

 of the lower lip of the peristome ; they point upward or inward or between the two posi- 

 tions; there are generally three spines present just above the orifice; the zooecium is 

 yellowish and dim toward the base. In a second specimen got from a stone taken by 

 trawler Active, each zooecium was punctured around the border very close to the 

 raised, separating ridge. Avicularia are constantly present, only a few having a single 

 avicularium. 



family: CRISIIDiE. 



Crisia ehurnea — (Linnaeus). — Specimens of this were found on the base of red algae 

 dredged in 20 fathoms; two small tufts, 1 cm. high from base of stem of Boltenia; 

 several branches 2-5 cm. high from stone obtained in Chedabucto Bay; from a hydroid 

 dredged in 20 fathoms at the entrance to Canso harbour; one small branch found at- 

 tached to Lafoea dumosa dredged in 20 fathoms near Canso harbour; a magnificent 

 branch 2*5 cm. high found growing on Rhodymenia palmata dredged in 20 fathoms. 

 The joints are always horn-coloured, branches generally do not arise from lowest 

 zooecium of the internodes but more frequently from the second, third, fourth or fifth. 

 In one specimen ooecia are present. They are always at the base of the branch and are 

 very ventricose with orifice not projecting nor tubular, but transversely narrow ellip- 

 tical. 



family: TUBULIPORIDiE. 



Tuhulipora flahellaris (Eabricius). — Colonies were found on Laminaria dredged in 

 10 to 15 fathoms. The young colonies are fan-shaped, the adult are almost orbicular; 

 there is no sign of lobation in either young or adult. 



Idmonea atlantica (E. Forbes). — One colony 2-5 cm. long was got on a muddy bot- 

 tom in 25-35 fathoms. The branching is fairly regularly dichotomous. There were no * 

 ooecia present. Another colony -75 cm. high growing on Lafcea dumosa was got in the 

 same locality. 



Idmonea serpens, Linnaeus. — Two small branches were found in an hydroid dredged 

 in about 20 fathoms near the entrance to Canso harbour. Its colour is ivory white 

 with no tinge of purple. 



Entalophora clavata (Busk). — A small, erect colony less than 1 cm. high was 

 found growing on an hydroid dredged at 20 fathoms. It sprang from the same base as 

 a branch of Idmonea. It is unbranched but clavate at the end and resembles com- 

 pletely in form Hincks' illustration, Plate LXY., 8d. (Br. Mar. Polyzoa). 



