166 MAZATLAN BIVALVES 



measures long.l'34i, lat.l'Si, alt. '36: an elongated valve 

 from the hole of a Lithodomus, long. 1"52, lat. '6. 



Hah. — West Coast of Africa on Ostrea iridescens, Stutchhury. — 

 Mazatlan ; extremely rare, on Chamse and Spondyli ; L'pool 

 Cul. — Panama, among pearl oysters ; F. Archer. 



Tablet 745 contains a young perfect pair, both valves detach- 

 ed, with hole like Anomia. — 746, a broken attached valve, 

 shewing the hinge and i^ortions of the plug. — 747, the elongated 

 valve. — 748, the large^ pair, detached, nearly perfect. 



217. Placunanomia foliata, Brod. 



Brod. in Pruc. Zool. Soc. 1834, p. 2. — Gray in JProc. Zool. Soc. 



1849, p. 121 :—B. M. Cat. Aiiom. p. \0.—B. M. Cat. B'Orb. 



Moll p. 88, no. 778. 

 + P. echinata, Brod. loc. cit., teste Gray. 

 + "P. pectinata, Brod." in Mus. Cuming, teste Gray. 

 Subgenus Pododesmus, Phil., Gray iu B. M. Cat. Anom. 



loc. cit. 



Only two young and transparent valves were found of this 

 species. White, with central brown stain ; outside with 

 prickly longitudinal striae. They seem to agree with a very 

 characteristic valve found in the S. W. Mexican collection. 

 Jjong. "75, lat. "57. 



Sah. — Guayaquil Bay ; on dead Pinna in sandy mud, 11 fm. ; 

 Cuming. — Ecuador, Guayaquil, D'Orhigny. — Isle of Muerte, 

 Broderip. — Martinique, no. 6, and Brazils, no. 7 ; Mus. Cum- 

 ing. — St. Vincent and Jamaica, Rev. L. Gmlding in B. M. — 

 S. W. Mexico P. P. C. — Mazatlan ; 2 valves in Spondylus 

 calcifer ; L'pool Col. 

 Tablet 719 contains the larger valve and fragments. 



218. Placunanomia clavictjlata, n, s. 



P. t. suhorhiculari, tenuissima, planat(i,[l(Pvi, sen. striis in- 

 crementi exiUimis : albd, macula brunned discam candidam 

 pyriformem liaml distinctam circumeunte ; tmlvd inferiori hya- 

 lind, j}erforatione magna, fiilchro \/-formi : lamelld albd acutd 

 prope perforationem intus dccurrente : valvd superiure mtisc. 

 cicatr. maJQre subovali, minore rotundatd, modice separatd. 

 Subgenus Monia, Gray, loc. cit. 

 Anomia, sp. 2, P. P. C., Cat. Prav. 



