344 POLYZOA INFUNDIBULATA. 



" The cells of this sea-mat are of an oblong square figure, swelling 

 out a little in the middle of each side. The openings of the cells 

 are defended by a helmet-like figure ; from hence the polype- shaped 

 suckers extend themselves. This sea-mat is of a slender and deli- 

 cate texture, like thin semitransparent paper, of a very light straw 

 colour. It was first found on the coast of Sussex, adhering to a 

 shell. I have since met, on the same coast, about Hastings, in the 

 year 1765, with several specimens, whose tops were digitated, and 

 others that were very irregularly divided." Ellis. 



Grows in small bushy tufts about an inch or little more in height, 

 the fronds dilating, very much divided dichotomously, the segments 

 spreading, rather narrow, expanded usually at the summit, and 

 either truncate or rounded. Cells oblong, truncate at both ends? 

 slightly dilated in the middle, with a small spine on the septa at the 

 place of junction with the adjacent cells. Wall of the cell very thin 

 and diaphanous, the polype-aperture small and unarmed, covered 

 above with a helmet-shaped operculum. The texture, compared 

 with the preceding, is thin, and the surface is often glistening as if 

 covered with a varnish. Sometimes it is partially tinted with pink. 

 More nearly allied to Flustra truncata than to F. foliacea, but evi- 

 dently a distinct species. Miss Howard informs me that it is com- 

 mon at Hastings. 



As this is very certainly distinct from the F. papyracea of Lin- 

 naeus, I have preferred the name of Gmelin. 



3. F. TRUNCATA, cells Unear-obloncf, with smooth margins. 

 PLATE LXII. Fig. 3, 4. 



Fucus marinus scruposus albidus augustior compressus, extremitatibus quasi abscissis, 

 Raii Syn. 43, no. 10. Morris. Hist. Plant. Oxon. iii. 546, tab. 1, fig. 17, opt. 

 Narrow-leaved Hornwrack, Ellis Corall. 69, no. 1, tab. 28, fig. 1, a. A, B. Ea- 

 chara foliacea /3, Lin. Syst. edit. 10, 804. E. securifrons, Pall. Elench. 56. 

 Flustra truncata, Lin. Syst. 1300. Mutt. Zool. Dan. prod. 253. Ellis and Soland. 

 Zooph. 11. Berk. Syn. i. 214. Esper Pflanz. Flust. tab. 3, fig. 1, 2. Oliv. 

 Zool. Adriat. 274. Lam. Anim. s. vert. 2de edit. ii. 2] 9. Grant, in loc. cit. 111. 

 Flem. Brit. Anim. 535. Johnston in Trans. Newc. Soc. ii. 264, pi. 12, fig. 1. 

 Templeton in Mag. Nat. Hist. ix. 469. 



Hob. In deep water. Very common on the shores of Scotland, 

 and of the north of England. In the south it seems to be rare, and 

 is not included in the Cornish Fauna of Couch. Miss Howard 

 writes that it never occurs, as far as she knows, at Hastings ; nor 

 has Dr. Mackness ever seen it there. In Ireland the species is local. 

 " In Templeton's collection are specimens from Dublin Bay. It is 

 common in Belfast Bay," W. Thompson. 



