Zoological Society. 22\ 



ming ; Loeen, Moll. Scand. 30 ; Forbes ^ Hartley , Brit. Moll. 334. 

 t. 56 ; Wood, Index Test. t. 10. f. 10, not Chemn. 



Squama Magna, Chemn. Conch, vii. 87. t. 77. f. 697. 



Anomia Squama, Gmelin, S. N. ; Schumacher^ Essai. 



Ostreum striatum, Da Costa, Brit. Conch. 162. t. 11. f. 4. 



Anomia undulatim striata, &c., Chemn. Conch, viii. 8. t. 77 > f. 699. 



Anomia undulata, Gmelin, Syst. Nat. i. 3346 ; Mont. I'est. Brit. 

 157. t. 4. f. 6 ; Maton ^ Racket, Trans. Linn. Soc. viii. 103 ; Turton, 

 Conch. Diet. 4. Bivalves, 230. t. 18. f. 8, 9 ; Dillw. R. S. i. 289 ; 

 Wood, Index Test. t. 11. f. 9. 



Ostrea striata, Pulteney in Hist. Dorset, 36 ; Donovan, B. Shells, 

 ii. t. 45 ; Mont. T. B. 153, 580. 



Anomia striata, Loven, Index Moll. Scand. 29 ; Forbes $• Hanley, 

 Brit. Moll. 336. t. bb. f. 1, 6. t. 53. f. 6. 



Hab. Coast of Europe. British Seas, Lister. North Sea, <S'ar*, fide 

 Mus. Cuming, n. 51. 



This species is easily known from the other European species by 

 being generally thicker and regularly radiately ribbed, and greenish ; 

 but the number and position of the muscular scars at once separate it 

 from all the multiform varieties of that species. Some authors, over- 

 looking the latter character, have been inclined to regard it as a mere 

 variety. 



I may remark, that the large series of this species which I have 

 examined has shown that the position of the two muscles is Uable to 

 a slight variation ; in by far the larger number of specimens the small 

 lower muscle is quite close to and confluent with the scar of the upper 

 larger muscle, but in a few specimens it is separated from the upper 

 larger one by a small interval or space. This has induced me to be- 

 lieve that probably the three West Indian species of the genus may 

 prove, when a larger series of specimens have been collected and com- 

 pared, only varieties of the same species. ^ • .i^js^ - 



fff Australian, 



9. Placunanomia zealandica. 



Suborbicular, white, smooth ; upper valve with distant radiating 

 grooves ; internally dark green. 



Upper valve with two confluent scars ; upper oblong, longitudinal, 

 lower rather small and more transverse. 



Anomia Zealandica, Gray, in DieffenbacKs New Zealand, ii. 261, 

 1843. 



Hab. New Zealand ; on the inside of mussel shells. 



10. Placunanomia ione. 



Shell white, laminar ; edge of the laminse with small, slender, elon- 

 gated processes ; internally green. 



Lower muscular scars small, round, on the lower hinder edge of 

 the larger one ; sinus or perforations large. 



Hab. Australia, Sydney ; on rocks, Mr. Strange. 



Mus. Cuming; three specimens. ?Van Diemen's Land. 



Dr. Sinclair, Brit. Mus., a single dorsal valve. 



