Zoological Society, 129 



convexiusculd, obtusd; anfractibus 4|-5 planiusculis t ultimo antice 

 subitb deflexo, basi concentrice et confertim striato ; umbilico me- 

 diocri, pervio ; aperturd subhorizontali, transverse ovali ; peri- 

 stomate subsimplice, reflexo, marginibus junctis . 

 Diam. 30, alt. 12 mill. 

 Island of Zebu. 



This shell has been often mistaken for H. Lasallii, Eydoux, and 

 is in many collections under that name ; but H. Lasallii is not this 

 species. It is quite congruent with H. meretria, Sow. 



May 12.-— Richard C. Griffith, Esq., in the Chair. 



Mr. H. E. Strickland exhibited a species of Corvus, discovered by 

 Capt. H. M. Drummond, 42nd R. H., which the latter gentleman 

 proposes to name Corvus collaris. In size and form it is closely 

 allied to the Common Jackdaw, Corvus monedula, but differs in the 

 much lighter silvery grey of the cheeks, occiput and nape, which 

 passes into a well-marked patch of pure white on each side of the 

 neck. The black on the crown is of less extent than in Corvus mo- 

 nedula, and the lower parts are of a slaty grey. 



Capt. Drummond states that in Macedonia and Thessaly this bird 

 takes the place of C. monedula, which is common in the south of 

 Greece, and does not there differ from the Jackdaw of Britain. 



June 9. — George Gulliver, Esq., in the Chair. 



A foetal Condor, extracted from an egg laid in the menagerie, was 

 exhibited to the Meeting. The egg had been placed under a com- 

 mon hen, which remained sitting on it for six weeks and two days. 

 The length of the specimen is 5f- inches ; the extremities, particu- 

 larly the legs, are imperfectly developed, but the head had acquired 

 a specific vulturine character ; a strong line of downy filaments ex- 

 tends along the length of each pectoral muscle ; all the other parts of 

 the body are quite bare. 



inches. 



Length of the head 1| 



Length of bones of wing 2 



Length of bones of leg to the end of longest toe . . 2 



Mr. Gould exhibited to the Meeting three new species of the family 

 of Trochilidce, which he thus characterized : — 



Trochilus (Petasophora) coruscans. Troch. strigd intense ca- 



ruled a mento per genas productd in aures, qua erectte ut cristula 



conspicantur ; plumis mediam gulam squamatim tegentibus nitide 



viridibus, cereo et coccineo colore resplendentibus ; medio abdomine 



cyaneo ; tectricibus caudcs inferioribus sordide viridibus, ad apices 



stramineis ; alis purpurasccnte fuscis. 



Crown of the head, all the upper surface, wing-coverts and flanks 



green ; tail-feathers very broad, steel-blue, with green reflections, 



and crossed near the extremity with a broad band of a blackish hue, 



as in the allied species Ana'is and serrirostris ; a band of rich pure 



blue commences on the chin and extends along the sides of the 



