OF l in. r \mii.\ OF NA1 \i»i>. 1 I? 



made. That of Mr Hyde is a large, old, and valuable speci- 

 men, but has lost sonic of its important characters. Both 

 wings are destroyed, the beaks much eroded, and the epider- 

 mis black and much wrinkled, and the rays obsolete. The 

 remarkable waves al the base of the posterior wing are almost 

 obsolete, and the beauty of the nacre aearly destroyed by be- 

 ing thick and opake; cicatrices very perceptible. In' this 

 specimen, and 1 believe it will occur in all adult individual-, 

 the only remains of the tamelliform tooth arc in the termina- 

 tion of it under the ligament, about an inch Ion-': the rest 

 of it is lust in the callus of the dorsal margin. It- dimen- 

 sions arc 

 Diam. 2-1, Length 5-5, Breadth 7-1 inches. 



In genera] form and character this species exteriorly resem- 

 bles most tin' Symphynota alata ; interiorly, except in colour, 

 tin' Symphynota kevissima, herein described ; the shape of the 

 lamelliform tooth of which assimilates to it. with the excep- 

 tion of its being double. The teeth in both these species de- 

 scribe nearly the same arc and take the same position. Both 

 species are alated anteriorly and posteriorly to the beaks. 

 The heoimma differs in having no undulations, and possessing 

 obsolete rays, double teeth, and purple nacre. 



The Dip.sas plicahu of Leach bears a strong resemblance 

 to this shell. It differs, however, in the wings of the D.pH- 

 cahu not being elevated, almost forming a line with the 

 beaks, in the latter not being connate, and in uol being crown- 

 ed with undulations at the beaks. Hi- description, however, 

 is so short and defective, and the drawing evidently bo badly 

 executed, that I cannot determine in what other points it 

 may differ. 



Schumacher's CrUtaria tuberculata bears a strong affinity 

 to fhis species also, as \m li in bis description as his plate. Hi 

 describes and figures it. however, as being alated posteriorly, 

 and not anteriorly, and do.s qo< mention its being connate. 

 The fact of its possessing a divided lateral tooth, "callus pa- 

 rallelus bifidus," proves thai it is not our Bp ci< 9. 



> OL. III. — ) \ 



