64 THE VOYAGE OF H.M.S. CHALLENGER. 



Myodora, Gray. 



Myodora pandoriformis, (Stutchbiuy). 



Anatiua jiandorifnrmis, Stutclibury, Zool. Journ., vol. v. p. 99, Tab. Suppl. 43, figs. 3, 4. 



Myodora 2)undoriform)s, Haiilej', Descrip. Cat. Eec. Biv. Shells, pi. x. fig. 9. 



Myodora imndoriformis, Smith, Proc. Zool. Soc. Lend., 1880, p. 581. 



Myodora pandoneformis, Eeeve, Conch. Icon., fig. 10 ; Proc. Zool. Soc. Lond., 1844, p. 93. 



Myodora brev/'s, H. and A. Adams (non Sowerby), Gen. Eec. Moll., vol. iii. pi. xcviii. figs. 2, 2a. 



Habitat. — Port Jackson, Sydney, 2 to 10 fathoms (Challenger, Stutchbury, and 

 Macgillivray) ; ]\Iiddle Harbour (Angas) ; Sydney Heads, 1 5 fathoms (Brenchley) ; Port 

 Philip (Brit. Museum). 



This species is easily recognised from the rest of the genus by its transversely elongate 

 form, its comparative smoothness, and the excessive fineness of the microscopic sculpture. 



Myodora hrevis (Sowerby). 



Pandora hrevis, Sowerby, Appendix to Stutchbury's Sale Catalogue, p. 3, pi. fig. 2. 



Anatina hrevis, Stutclibury, Zool. .Journ., vol. v. p. 99, Tab. Suppl. 43, figs. 1, 2. 



Myadora hrevis, Eeeve, Proc. Zool. Soc. Lond., 1844, p. 93. 



Myadora brevis, Eeeve, Conch. Icon., figs. 7a, h. 



Myodora hrevis, Hanley, Cat. Eec. Biv. Shells, pi. x. fig. 13. 



Myodora hrevis, Chenu, Man. Conch., vol. ii. p. 52, fig. 217. 



Habitat. — Port Jackson, Sydney, 2 to 10 fathoms (Challenger, Stutchbury, and 

 Brenchley) ; Lane Cove, Farm Cove, and Mossman's Bay (Angas) ; Cape Upstart (Mus. 

 Cuming) ; New Zealand, Stewart Island, and Tasmania (Brit. Mus.). 



The Myodora hrevis of Woodward's Manual of MoUusca, pi. xxiii. fig. 12, is the 

 Myodora striata of Quoy and Gaimard, and Messrs. H. and A. Adams' identification of 

 this species (Gen. Rec. Moll., vol. iii. pi. xcviii. figs, 2, 2a) is also incorrect, the shell there 

 delineated being Myodora pandoriformis. In my Monograph of this genus ^ I observe 

 that the form of this species is subject to considerable variation. This may be seen 

 by comparing the figure in the Stutchbury Sale Catalogue with that in the Zoological 

 Journal. The series of specimens in the British Museum, too, indicates how variable 

 this species is with regard to outline, the apical angle in some being much more acute 

 than in others. The microscopic sculpture consists of a very minute granulation, the 

 granules being of unequal sizes, and frequently transversely oblong. This granu- 

 lation is coarser than in the other species of the genus, and the almost total absence 

 of the radiating microscopic lines in all of them is remarkable. The Tasmanian 

 specimens are peculiar on account of the greater coarseness of the concentric raised ridges ; 



^Proc. Zool. Soc. Land., 1880, p. 580. 



