228 



appearances a distinct although closely allied species, and accord- 

 ingly assigned to it a new name in my MS. At Neufchatel I 

 again saw Tschudi's analis (the types described in the Fauna Peruana 

 being contained in the Museum at that place), and I was also so 

 fortunate as to obtain by exchange, through the courtesy of M. Cou- 

 lon, the Directeur of the Museum there, a duplicate example of 

 that species. Upon comparing this with a skin lately received by 

 Mr. Gould along with other birds from the neighbourhood of Quito, 

 I find the same differences as I had previously noted in the Berlin 

 Museum specimen ; and, fortified by a second example, no longer 

 hesitate to introduce the bird as new to science under the title of 

 Iridornis porphyrocephala . 



2. Descriptions of (supposed) New Species and Varieties 

 of Shells, from the Californian and West Mexican 

 Coasts, principally in the Collection of Hugh 

 Cuming, Esq. By Philip P. Carpenter. 



1. Pandora claviculata. 



P. t. magna, complanata, alba, epidermide fusva induta ; antice 

 curtissima, postice valde rostrata ; rostro lato, valde projiciente, 

 sulco in utraque valva ab umbone currente ; concentrice undulata; 

 margine ventrali maxime excurvato ; margine dorsali postico sub- 

 irregulariter arcuato ; cardine lira (quasi clavicula) ligamentum 

 ferente prcelonga, dimidium ab umbone rostrum versus decurrente ; 

 dente antico satis product o ; valva dextra denticulo tertio inter 

 alios munita ; cicatricibus muscularibus, antica rotundata, postica 

 ovali, a margine valde distantibus, inter quas punctularum catena ; 

 aliter pagina interna haud punctata. 

 Long. 1-23, lat. 178, alt. '22 poll. 



Hab. Mazatlan : legit " Conway Shipley, Esq.", olim Lieut. R.N. 

 Mus. Cuming. 



This magnificent species differs from similar forms found in the 

 Philippines and New Zealand, in having the fold much larger, with 

 the dorsal margin less arcuated. In form it closely approximates 

 the Californian species, P. punctata, Conr.; but differs in the 

 absence of punctures (except at the pallial line), and in the remark- 

 able 'character of the hinge. In P. punctata, the ligament is (in one 

 valve) affixed to the outer margin, which is bent upwards to receive 

 it at right angles ; in this, there is a sharp internal ridge, or clavicle, 

 fully one half of the entire length from the umbo to the beak, at the 

 base of which the ligament is situated. 



2. Lyonsia (Osteodesma) diaphana. 



L. t. valde incequilaterali, irregulari, sed plerumque pyriformi ; al- 

 bida, tenuissima, translucida; epidermide nitida,albo-fvsca induta ; 

 parte antica parva, satis excurvata ; parte postica maxime pro- 

 longata, margine dorsali incurvato ; margine ventrali excurvato, 



