Marine Animals found on the Coajl of Wales. \ i 



body is covered on the upper fide by five unequal 

 valves. It is remarkable of this fpecies, that it is 

 furniilied with two apertures, one at the confluence 

 of the valves, the other in the largeft valve; their 

 pofition with refpedl to the centre is variable : tlie 

 laft may readily efcape obfervation, except when the 

 animal choofes to elevate it above the plane of the 

 valve. When fully expanded, the infide appears 

 clothed with a fine membrane longitudinally folded 

 and revolute at its margin. Colour deep red. 

 Since the illuftrious Mr. Pennant has not referred his 

 h..decacnemos to the A.pedlinata Linn, (though he has 

 quoted Barrelier and the figure of Linckius, which 

 are given by Linnseus as fynonyms to his A.pe£li- 

 natajy I cannot but feel apprehenfive of having 

 committed an error in confidering them as the fame 

 fpecies, and have confequently affixed a mark of 

 doubt to the Llnnean reference; but fince the fpecific 

 chara6ler given in the Syjlema Natures accords per- 

 fectly with numberlefs fpecimens which I have exa- 

 mined, I truft it will not be the caufe of any confufion 

 to a Britilli naturalift. 



SERTULARIA, 



I. imbrlcata. S. fubramofa, veficulis fubclavatis, uubum inordinate 

 imbricatis. 



Tab. II. fig. 5 — i r. 

 On the Fuciis ntdofus. Milford Haven. 

 Ohf. This fpecies feems moft nearly allied to the S. a-' 

 C 2 drina. 



