264 Dr. Johnston' s' Catalogue of Zoophytes. 



Height about four inches. The segments vary very much in their breadth, but are never 

 proliferous. Cells small, narrowed at the base, dilated and rounded at the top. 



Hooke has given a very good description and magnified figure of this production in his 

 celebrated Micrographia, where he says, " for curiosity aud beauty, I have not among all the 

 plants or vegetables I have yet observed, seen any one comparable to this sea weed ;" and 

 indeed, to those who amuse themselves with the microscope it forms a fine object, exceeded, 

 however, in beauty, if not in regularity of design, by many similar productions. Hooke 

 himself seems to have been aware of this in some degree, for he adds, '• and 1 doubt not, 

 but that he that shall observe these several kinds of plants (as they were deemed to be in his 

 day) that grow upon rocks, which the sea sometimes overflows, and those heaps of others 

 which are vomited out of it upon the shore, may find multitudes of little plants, and other 

 bodies, which, like this, will afford very beautiful objects for the microscope ; and this speci- 

 men here is adjoined only to excite their curiosities who have opportunity of observing to ex- 

 amine and collect what they find worthy their notice." 



2. F. truncata, polypidom bushy, divided dichotomously ; segments rather narrow, strap- 



shaped, abruptly truncate ; lateral segments wedge-shaped, bifid, narrow at the base ; 

 cells linear oblong with smooth margins. Square-top 'd Sea-matt (tab. nost. xii. fig. 1). 

 F. truncata, Soland. Zooph. 11; Turt. Lin. iv. 663; Turt. Brit. Faun. 209; Stew. 

 Elem. ii. 436 ; Lam. Hist. Nat. ii. 157 ; Lamour. Corall. 44 ; Bosc, Vers, iii. 140, t. 

 xxx. f. 1, copied from Ellis ; Flem. Br. Anim. 535; Hogg's Stockton, 36. 

 Fucus marinus scruposus albidus angustior compressus, extremitatibus quasi abscissis, 



Rati Syn. 43, No. 10. 

 Narrow-leaved Hornwrack, Ellis, Corall. 69, t. xxviii. f. 1, a, and t. xxxviii. f. 8. 

 Hab. In deep water on all the coast, still more common than the preceding. 

 This attains a height of four or five inches, is very bushy, of a straw colour, and rather 

 thin texture. " The base is furnished with adhering root-like tubes ;" the polypidom 

 itself is divided, in a dichotomous manner, into numerous narrowish segments, and, from the 

 edges of these originate, by a very short pedicle, wedge-shaped segments, at first simple, 

 but afterwards deeply bifid. The apices of all the segments is abruptly truncate. The 

 cells are placed on both sides, and are generally marked with a black dot, scarcely visible 

 except under the magnifier. The polypidom is also commonly marked with some flesh- 

 coloured spots or bands, which proceed from imbedded grains of that colour, and which we 

 may presume to be the ova. 



3. F. carbasea, polypidom thin, deeply divided ; segments broad, rounded at the ends ; 



cells on one side only, large, oblong, narrowed and truncate at the base, the margins 

 toothless. Lawn Sea-matt (tab. nost. ix. fig. 4.) 

 F. carbasea, Soland. Zooph. 14, t. 3, f. 6, 7 (the figure of the natural size is not char- 

 acteristic, yet copied by every subsequent compiler). Turt. Lin. iv. 663 ; Turt. Br. 

 Faun. 209 ; Stew. Elem. ii. 436 ; Lam. Hist .Nat. ii. 157 ; Lamour. Corall. 45 ; Bosc, 

 Vers, iii. 141 ; Flem. Br. Anim. 535 ; Hogg's Stockton, 36 ; Stark Elem. ii. 437. t. 

 viii. f. 13, from Ellis; Grant in Edin. New Phil. Joum. for April, 1827. p. 111. 



