136 Dr. GooDENoUGH and Mr. Woodward'^ Obfervculom on 



but are fometimes obferved on the others. In a young ftate they 

 are regularly formed and naked ; but when the plant is more ad- 

 vanced, they frequently grow larger, are irregular in their fhape, 

 and are often in part covered with tubercles, fimilar to thofe on the 

 terminating foliaceous fegments. 



The diftindions between this, abrotan'ifolius, and barhatus, arc 

 mentioned under thofe fpecies; but as it has been confounded with 

 concatenatus of Linnseus, it may not be improper to point out in 

 what they differ, notwithftanding the defcribing of the latter does 

 not come within our prefent plan. In fcenkulacem the plant 

 branches direftly from the root ; in concatenatin the principal ftem 

 is continued throughout — in the former the branches grow with- 

 out order ; in the latter they are more regularly oppofite than 

 in any other marine plant we have feen — the concatenated 

 veficles are larger and fewer in fcen'iculaceus than in concatenatusy 

 and in the latter the veficles are conflantly naked, never having 

 any tubercles upon them : the whole plant alfo, though perhaps 

 longer, is much more flender, and more delicately formed in. all its 

 parts. 



Whether harhatm Sp. PI. fosnkulaceus /3 Syft. Nat. be the plant 

 we have called barhatus, as from the reference to Gmelin might 

 reafonably be fuppofed, or whether it may be fome varied ap- 

 pearance of this plant, it is impoffible from the imperfedlion 

 and uncertainty of the fpecimens fo named in the herbarium, to 

 afcertain. 



This plant is thrown up on the fhore at Weymouth in May, 

 June, and July, and but rarely after that time. 



Obf. Since this article was written, young fpecimens oi ftenicula- 



cetis znd concatenatus have fallen under our obfervation ; from which 



we are enabled to ftate, that in both fpecies the firft branches are 



3 m 



