174 ^f* William Wood's Obfervations on the 



Fig. 11,12. The fame magnified, (a.b) Two teeth which receive be- 

 tween them the triangular tooth (c). (d) A fmall 

 tooth which paffes on the outfide of (a). (e. e. e, e) 

 Lateral teeth. 

 13, T4, The hinge of the Teliina rtvaVts. 

 ' 15, 16. The fame magnified, (a.b) Two teeth which unite, and 

 are continued to form an arch for the reception of 

 the triangular tooth (c), on one fide of which is a fmall 

 tooth (d). (e. e. e. e) Lateral teeth. 

 17,18,19. Hinge of the Tellina birnaculata, 

 20,21. Teii'mafervenjts, (a.b) Two ere6t teeth. In myfpecimen, 

 one is plain, the other notched, (c) A fmall ridge di- 

 viding a depreffion by the fide of (a). 



Tab. XVL 



I, 2. Card'ium aculeatum. (a. a. b. b) Four ere6l teeth which 

 lock together when the fhell is clofed. (c) A remote 

 tooth which fits between (d. e), while (f ) receives its 

 oppofite, fg). 

 3, 4. MaBra lutraria. (a) The great tooth. (b)The fpoon-fhaped 

 cavity, (c) The place which receives the great tooth. 

 5,6. A/<j<??rtf i6i^«j". (a)Theere6t tooth. (b.b)The great cavity. 

 (c. d) Two teeth which receive (a) between them. 

 ^'"" ^ y'^/ (e) A fmall cavity for the grooved tooth (d). (f.f ) A 



narrowfulcus. . - ... 



7,8. Madira ftultorum, (a) The triangular tooth. (b)There(Sl- 

 angular one in the oppofite valve, (c. c) The cavity 

 for the cartilage. (d. d. d. d) Remote teeth. 

 9, 10. Madira alba of the natural fize. 

 31,12. The hinge of the fame magnified. (a. a) The fpoon- 

 fliaped cavity, (b) A fmall tooth., (c.c) Remote teeth. 



Fig. 



