MVADORA.— Plate I. 



striae numerous, close, irregular; anterior depres- 

 sion concave; hinge furnished with a testaceous 

 appendage. 

 Gray, MSS. British Museum. 



Pandora striata, Deshayes, Mag. de Zool. 

 Hub. Port Nicholson, New Zealand ; Swainson. 



Fig. 6 b represents the testaceous clavicle, or hinge- 

 piece ; Fig. 6 c the right, or flat valve, with the clavicle 

 in situ attached to the ligament. 



Species 7. (Mus. Cuming.) 

 Myadora brevis. My ad. testd sub/rigond, antice 

 Jlexuoso-costatd, concent rice striata, striis mtmerosis, 

 elevatis, peculiariter rugosis ; umbonibus antice re- 

 flexis ; cardine appendiee testaced munito. 

 The short Myadora. Shell somewhat triangular, 

 flexuously ribbed, anteriorly concentrically striated, 

 strise numerous, elevated, and peculiarly wrinkled ; 

 umbones reflected anteriorly ; hinge furnished with 

 a testaceous appendage. 



Anatina brevis, Stutchbury, Zool. Journ., vol. v. 

 p. 99, Tab. Supp. 43. f. 1. and '2. 



Hal. ? 



Having seen only the single left valve of this remark- 

 able species here figured, I am unable to say anything 

 of the right valve ; Mr. Stutchbury, however, describes 

 it as being slightly convex. He states also that this 

 shell is furnished with a testaceous clavicle. 



Species 8. (Mus. Cuming.) 



Myadora oblonga. Myad. testa trigono-oblongd, an- 

 tice latissime truncatd, concentrici striata, striis ele- 

 vatis. regularibus , prope marginem anticam angulatis. 



The oblong Myadora. Shell triangularly oblong, 

 very broadly truncated anteriorly, concentrically 

 striated, strise raised, regular, angulated near the 

 anterior margin. 



Reeve, Pro. Zool. Soc. Is44 



Hub. Island of Mindoro, Philippines ; Cuming. 



The anterior side of this species is the most broadh 

 truncated of any. 



Species 9. (Mus. Cuming.) 



Myadora curvata. Myad. testa curvato-oblongd, valvd 

 dextrd convexiuscu/d, antice subindistincfe flexuoso- 

 COStatd, eoncentrie'e striata, striis elevatis, angustis. 

 regularibus. 



The curved Myadora. Shell of a curved oblong form, 

 right valve rather convex, anteriorly somewhat in- 

 distinctly flexuously ribbed, concentrically striated, 

 striae raised, narrow, regular. 



Reeve, Pro. Zool. Soc, 1844. 



Hab. Island of Corrigidor, Philippines ; Cuming. 



This species differs also in form rather than in variety 

 of sculpture. 



Species 10. (Mus. Cuming.) 



Myadora Pandor^eformis. Myad. testa oblongo-ovatd, 

 antice leviterflexuosd, abrupte truncatd, valvd sinistra 

 vru/ricoso-eoncavd ; coneentriee striata, striis valves 

 sinistra; umbones versus elevatis, valves de.rtnr subti- 

 /issimis. lavigatis ; umbonibus antice inflexis ; cardine 

 appendice testaced munito. 



The Pandora-shaped Myadora. Shell oblong-ovate, 

 slightly flexuous anteriorly, abruptly truncated, left 

 valve ventricosely concave ; concentrically striated, 

 stria; of the left valve raised towards the umbones, 

 those of the right valve very fine, smooth ; umbones 

 inflected anteriorly ; hinge furnished with a testa- 

 ceous appendage. 



Anatina Pandoraformis, Stutchbury, Zool. Journ., 

 vol. v. p. 99, Tab. Supp. 43. f. 3 and 4. 



Hab. ? 



The Myadora striata, brevis and Pandorteformis are 



the only species of the genus at present known to have 



the clavicle. 



