Zoological Society. 309 



Hah, New Guinea, in seven fathoms, mud ; Cagayan, island of 

 Mindanao ; San Nicholas, island of Zebu, Philippines, in from five to 

 thirty fathoms, sandy mud. 

 Cab. Belcher et Cuming. 



Not unlike diminutive specimens of N. cuspidata ; the anterior por- 

 tion of the shell, however, does not occupy more than a third of its 

 entire length ; the beak is more attenuated and of a rose-colour ; and 

 I cannot perceive any vestige of the angular line which extends pos- 

 teriorly from the umbo. 



Ne^ra Philippinensis. N. testd ohlongd, albidd, suhplanulatd, 

 epidermide tenui striata indutd, in rostra brevi attenuatd; valvis 

 incegualihus , dextrd minori. Long. 2^ ; lat. 1 ; alt. 1^ lin. 

 Hah. Cagayan, island of Mindanao, and Batangas, island of Luzon, 

 Philippines ; in from twenty to thirty fathoms, sandy mud. 

 Cab. Cuming. 



Ne^ra trigona. N. testd trigond, alhd, minute sulcatd; latere 

 antico retuso ; rostro brevissimo, ohliquo. Long. 2^\ lat. 1^; 

 alt. If lin. 

 Hah. ? Cab. Cuming. 



Ne^ra iridescens. N. testd albidd, ventricosd, lavigatd, politd; 

 valvis cequalibus, margine ventrali postice emarginato ; retuse roS' 

 tratd. Long. 8 ; lat. 4 ; alt. 5^ lin. 

 Hah. Sual, island of Luzon, Philippines ; from five to seven fathoms, 

 sandy mud. 



Ne^ra opalina. N. testd ovali, hyalind, lavigatd, politd, suhplanu- 

 latd; valvis (Equalibus ; rostro gradatim elongato, obtuso. Long. 

 6 ; lat. 2 ; alt. 4^ lin. 

 Hab. Bassey, island of Samar, Philippines; from four fathoms, 

 among coarse sand and mud. Cab. Cuming. 



In the foregoing ventricose species the anterior portion of the shell 

 is considerably dominant. In this flatter species the greater bulk is 

 devoted to the formation of the rostrum. 



Ne^ra lata. N. testd ovali, albidd, planulatd, iridescente, Icevi- 



gatd, politd ; valvis (equalibus ; rostro lato, gradatim attenuato, 



planulato, obtuso ; margine ventrali postice suhemarginato. Long. 



12; lat. 4; alt. 7 lin. 



Hab. Catbalonga, island of Samar, Philippines; from ten fathoms, 



soft mud. Cab. Cuming. 



These three latter species are aberrant, and hold the same relations 

 to Necera as Nucula arctica, Brod. et Sow., and its congeners do to 

 that genus. 



Various species of Mammalia from Cohan, in Central America, were 

 exhibited. These specimens were from Mr. J. Gray, who in a letter 

 addressed to the Curator, which accompanied them, observes that 

 the collection contains the following species; \\z. Mustela frenata, 

 Licht., Didelphys Quica, Heteromys Desmarestiana, Cor sir a tropicalis, 

 Corsira Temlyas, Saccophorus Quachil, Mus Tazamaca, and Mus Te- 

 guina ; all of which species, with the exception of the first two, are 

 new to science. 



