FoJJil Ammtee found hi Derbyjhire. 47 



ways found fixed to (tones, corals, &o by a flrong tendinous liga- 

 ture, that paries through their perforated beaks. In this fpecies.it is 

 evident, from the apparent fize of the aperture, that a large portion 

 of the included animal was left bare, which, inftead of a ligament, 

 might have been furnhlied with a ftrong adhefive power, fimilar to 

 that enabling limpets, and fome other univalves, to (tick to rocks, Sec. 

 In Tab. 4. I have given a fketch of the (hell thus fixed : it will 

 help to elucidate the idea I have formed relative to its recent date ; 

 and, as the pofition of the figure differs, may affift the explanation 

 of the other figures. 



Tab. IV. 



The large figure in this table (5*) has been already noticed : the 

 fmall figures are explanatory of a few remarks I beg leave to offer 

 on the hinge and perforation of the FoJJU Anomi& 9 together with a 

 iketch of an arrangement which will include all the different (pedes 

 yet collected in Derbyfhire. 



Of the Hinge, 



It has been fnppofed that the Anomta whofe hinge is on a ftraight 

 line, like that of fome of the Area, were in a fimilar manner mult- 

 articulate, or furnifhed with many teeth: but perhaps this is not 

 the cafe : — in all of them I am fure it is not. The moft perfect ex- 

 traneous foffil I ever law, was nfingk valve of a fqu are- hinged A no- 

 rma: it retained its fhelly nature, with little or no change, and the 

 hinge was quite entire and diftinet. In this, however, as well as in 

 many lefs perfect petrifactions of fingle valves of the fame kind I have 

 occafionally met with, I could never difcover the leaf!: appearance of 

 a multarticulate connexion. Indeed from what I have been able 

 to obferve it fhould feem, that the car do in the ftraight-hinged foffil 

 Anomia is the fame, in many refpeefs, as that of the recent fpecies, 



namely, 



