the Bntifli Fuciy with particular Defalpthm of each Species. 183 



out fmall branches more or lefs horizontal and obtufc : the varia- 

 tion confifts in the breadth or fincnefs of the principal branches, 

 and the proportion which they bear to each other. The difference 

 of foil and fituation moft likely occafions this variety of appearance. 



We found the two firft varieties, both fmall in their kind, on the 

 rocks near Exmouth in Devonshire — the var. a. on the edges of 

 the little cavities of the rocks under the coarfer forts, viz. V . ferratus,, 

 veficulofus, &c. — the var. /3 was a little more expofed. The third var. 

 we have found only on the extremity of the Ifle of Portland near 

 the lighthoufes— the fourth near Ilfracombe, where it is very plen- 

 tiful.. AH thcfe varieties are readily kept diftintfl from oblufus by 

 their extreme branches being obtufe and entire, and not truncated. 



Thefpecimens preferved in Buddie are large, and, being blanched, 

 fo juftly anfwer his defcription of corneus et ienax, that we preferve 

 the name corneus. The propriety of this appellation is feen only in 

 thefe larger and thicker fpecimens. Mr. Lightfoot does not appear 

 to have feen it otherwife than in its fmaller ftate, fuch as it appears- 

 in our fecond variety. He called it nereideus, from its fimilarity to 

 the Nereis^ an animal claffed by Linnseus among the Mollufca. 



It is a great argument, we own, for thefe varieties being feparated 

 into diftin(ft fpecies, that they are found growing in fuch diftant 

 fituations, and fo detached from each other ; but their limits are 

 not to be afcertained. 



We have not obferved any fruftification upon the two laft 

 varieties. 



43. Fucos GicARTiNus— Tab. 17. Fig. 3, 4^ 



F. fronde cartilaginea dichotoma ramofa, ramis aequalibus 

 acutis fpinofo-dentatis ; tuberculis globofis lateralibus 

 feflilibus. Herb. Linn. Murray Syji. Feg. p. 971. 



Habitat 



