33 



P. PENNATULA. " Plumose ; the pinnae opposite ; cells 

 in a close row, cop-like, with an unequally crenated margin, 

 supported on the uuder side, bj a lengthened incurved spinous 

 process." Montagu. 



Sertularia pennatula, Ellis and Solander's Zoopb., p. 56, 

 tab. 7, figs. 1 and 2. Aglaophenia pennatula, Lamouroux's 

 Cor. Fiex., p. 168. Sert. pennaiula, Turton's Lin., vol 4, 

 p. 681. Plum, pennatula, Fleming's Br. An., p. 546. John- 

 ston's Brit. Zooph,, p. 145, pi. 8, figs. 1 and 2. 



Hab. On Pinna ingens, from deep water, off Deadrnan 

 point, very rare. 



This is so rare a species, that I have met with but one 

 specimen. In its general appearance it approaches very 

 closely to the Podded Coralline; from which however it is 

 very readily distinguished. The stem is divided into joints, 

 each bearing two pinnee ; the pinnae are closely arranged, 

 waved and opposite. The cells are unilateral, on the inferior 

 edge of the pinnae, one on each internode; they are small, 

 cup-shaped, with irregular patulous apertures, and with a 

 ruinate denticle on each side; from the base of each proceeds 

 a long tubular spine, which varies in length from two to two 

 and half times the diameter of the cell and rises above it. 

 The specimen procured in the Cornish seas, was not so 

 closely pinnated as Ellis' beautiful figure, but more so than 

 Johnston's. 



That variety of the Podded Coralline, which has the 

 lengthened sub-marginal spine, bears a great resemblance to 

 this species. But it is distinguished from it, by the cells 

 being on the upper margin of the pinnae, deeply tubular, by 

 the regularity and decided manner in which the margin is 

 dentated, and by the spine, though long, projecting from the 

 side of the cell, leaving a space between it and the margin of 

 the mouth, which is not the case in this species. 



SEA BRISTLES. P. Selacea. Plumose ; the pinnae al- 

 ternate, one on each internode of the stern, rising near the 

 joint on a slight protuberance; cells distant, cup-shaped, 

 with an even margin, resting on an enlargement of the 

 branch, with two minute teeth between each ; vesicles 

 elliptical, smooth. 



Sea Bristles, Ellis' Coral., p. 19, pi. xi., no. 16, a A., tab. 

 38, figs. 4, d.t. Aglaoph. setacea, Lamoroux's Cor. Flex., 

 p. 172. Sert. pinnata, Stewart's Elero., vol. 2, p, 446. Sert. 

 setacea, Turton's Lin., vol. 4, p. 683. Plum, setacea, Flem- 

 ing's Brit. An., p. 547. Templeton in Mag. Nat. Hist., vol. 

 9, p. 467. Johnston's Brit. Zooph., p. 146, pi. 18, figs. 

 3 and 5. 



