10 



from the inferior point of the junction of these parts, and 

 directed obliquely upward to the edge; where they are 

 opposite to similar lines on the smaller plate, which con- 

 verge on a part of the superior margin a little distant 

 from the point: from which latter portion similar lines 

 pass obliquely upward and backward to the same space. 

 The dorsal plate has a distinct smooth ridge or keel; 

 but possesses longitudinal lines passing from behind forward 

 to the edge. Colour a leaden blue, the stalk short, almost 

 sessile. 



Montagu once found this species, in an immature state, 

 attached to the Gorgonia Flabellam : a species of coral not 

 yet beyond a doubt, as a native of the British Seas. Some 

 specimens were presented to me by a young Lady, from the 

 coast of Ireland ; and on the following day I was so fortu- 

 nate as to find a collection of them, attached in clumps on 

 both sides of a piece of the bark of a tree. Comparing these 

 with Montagu's description and figure, I find the terminal 

 side plate less sharp, and the characteristic raised lines more 

 numerous ; for in Montagu's specimens there were no more 

 than 15, which he terms strong ribs; while in the larger 

 individuals from which my description "was drawn, there 

 were 28 in one, and 29 in another. On the lesser side plate 

 I counted 17, instead of seven or eight as noticed by Montagu. 

 All of them were of an equal marking, so as to give the 

 specimens an elegant appearance: the plates closely joined, 

 without an appearance of membrane; and the lines on both 

 plates continuous, instead of forming an angle, as in Mon- 

 tagu's figure. The Irish specimens in this respect approach 

 more nearly to the engraving; their breadth being greater 

 than the Cornish, in comparison with their length : the plates 

 also of a firmer texture, with a few undulations crossing the 

 raised lines ; those on the anterior plates also standing at an 

 angle with those behind. But these again differ from Mon- 

 tagu's specimens in having 38 lines on the hinder plate, and 

 20 on the anterior, with none on the dorsal plate. The 

 overlapping of the right plate over the left, is common to the 

 whole of these specimens and Montagu's figure. Shortly 

 after the discovery of these specimens, I obtained a piece of 

 cork, such as is employed by fishermen for their nets ; and 

 on one side of it were found several small specimens of this 

 Barnacle, scattered singly over its surface. Including the 

 footstalk which indeed is too short to enter into the measure- 

 ment, their length did not exceed the tenth of an inch; and 

 their structure was more rough and unsightly, the raised 

 lines less numerous and regular, than in my former and 

 larger specimens. About the same time also, Mr. Jackson, 



