the shell, in some specimens with a few short white dashes 

 diverging from the radiating ridges. The intermediate 

 valves mucronated, bisected on each side hy one raised 

 radiating rib, the posterior margins sinuated and thickened 

 by coarse concentric lamellae : the entire suiface is covered 

 with minute striate-wrinkling, those near the ridge being 

 coarser than the rest and radiating from it like the weljs 

 from the shaft of a feather. The posterior terminal valve 

 has the mncro quite terminal. The anterior valve radiately 

 eight-ribbed (at times one or two additional minor ones are 

 present) with diverging oblique striations on each side of 

 them. Interior of valves greenish-blue; valve lobes 

 whitish, the siitus between tliem deep ; the hairs or bristles 

 on the mantle-margin are short, few and horny, those 

 arising from the nine pores being thicker than the rest. 



Largest specimen (in a contracted state) 42 mill, long : 

 width of valves, 20. 



An average specimen. Length, 25 mill. ; width, 11. 



Hab. New Zealand {Col. Bolton and Capt. Stokes). 



" Terminalis " appears to be but a manuscript name 

 attached to some specimens in the Cumiugian collection. 

 As I understand that Dr. P. P. Carpenter is engaged on a 

 work on Chitonulce I retain the characteristic name he 



The central white stripe with the black one within it 

 appears to be very constant. 



Ps.\M.MOBIA LIXEOLATA. Tab. 2,fifj. 11. 



Psammobia lineolata, Graij in Dieffenhach's N. Z. II., v. 

 253. 



Hab. New Zealand. 



Tellixa glabkella. Tab. '2, Jig. 7. 

 Tellina glabrella, Deshcujes, Proc. Zool. Soc, 1854, p. 366. 

 Hab. New Zealand. Type in Brit. Mus. 



Family Macti;id.e. 



Mactra uiscoks. Tab. 2, ///. 4. 



Mactra discors, Girii/, Anmds and Maij. Nat. Hid. I., 

 1837, _p. 371. 



Hab. New Zealand. 



The above figure is taken from a very young specimen. 



Mactra (Spisula) ^quilateralis. Tab. 2, fig. 10. 



Mactra tequilateralis, Dcshayes, Proc. Zool. Soc, 1853, 

 p. 17. 



M. ajquilatera. Peeve, Conch. Icon. VIII., /. 14 ; Von 

 Martens, List New Zealand Mollusca, p. 44. 



Hab. New Zealand. Type in Brit. Mus. 



Family BuLLiD^. 



Bulla Quqyii. Tab. \,fig. 11. 



Bulla Quoyii, Ch-ay, in Dicffcnbach's N. Z. II., p. 243. 

 Hab. New Zealand {Dr. Stanger). T}^e figured 



Haminea Zelandi/E. Tab. I, fig. 10. 



Bulla Zelandiaj, Gray, in Dieffenbach's N. Z. II., p. 243. 



Haminea obesa, Sowerby, Conch. Icon. XVI., /. 13. 



Hab. New Zealand {Dr. Dieffenbach). Type figured. 



This species is certainly distinct from H. pernphis, 

 Philippi, of which it is considered a .synonym by A. 

 Adams, Thesaurus Conch II., p. 580. See Annals and 

 Mag. Nat. Hist., 1872, IX., p. 347. 



M.A.CTEA (Staxdella) ovat.\. Tab. 2, fig. 2. 



Spisula ovata, Gray, Dicfi'enbach's N. Z. 11., p. 251. 

 Halj. West Coast of the North Is., New Zealand {Dieffen- 

 bach). The type is figured. 



Vaxganella Taylorii. Tab. 2, fig. 5. 



Vangauella Taylorii, Gray, Proc. Zool. Soc, 1851, ^j. 125 ; 

 Ann. and Mag. N. H. 1853, XL, p. 476. 



Eesania lanceolata, Gray, Ann. and Mag. Nat. Hist, 

 1853, XL, ;?. 43. 



Lutraria lanceolata. Peeve, Conch. Icon. VIII. , / 17. 



Hab. New Zealand {Pev. P. Taylor). 



The type specimens presented by the Rev. R. Taylor to 

 the British Museum are not adult, but the one figured is 

 full-gi'own. 



Family Pholadid.e. 



Pholadid.ea TRIDEXS. Tab. 2, fig. 8. 



Talona tridens, Gray in Dieffenbach's N'. Z. II., p. 254. 

 Hab. New Zealand {Dr. Stanger). TyP*^ figured. 



Family Telllxid.e. 



Soletellixa nitida. Tab. 2, fig. 9. 



Psammobia nitida. Gray in Dicfi'enbach's N. Z. II., p. 253. 

 Hab. New Zealand {Dr. Stanger). 



Taria vextricosa. Tctb. 3, fig. 6. 



Mesodesma ventricosa, (??•«?/, Dieffenbach's N. Z. II., ^j. 252. 



Hab. New Zealand. 



This species must not be confounded with T. lata, 

 Deshayes, which is distinguished at once by the sinus in 

 the pallial line being rather shallow in comparison with 

 that in vcntricosa, which is considerably deeper, and the 

 latter shell is more inequilateral, and has two obsolete 

 keels (in the figure only one is shown) radiating from the 

 uinbones to the margin down the anterior end of the 

 valves, whereas in lata there is but a single obsolete angu- 

 lation. 



