160 



bifid, pallial sinus narrow, rounded, and obtuse. White re- 

 ticulated posteriorly with black angulate lines, sometimes 

 radiately rose tinted towards the umbones. 



Not uncommon on South coast. A small shell, very dis- 

 tinct by its finely crenulately striate obsolete ribs, and reticu- 

 late markings. 



Myodoea tasmanica. n.s. M. testa albida, curvato-ohlonga, antice leviter 

 Hexuosa, abrujJte truncata, valva sinistra ventrieoso-convexa, dextera distincte 

 concava ; concentrice striata ; striis paucis, rotundatis latiuscidis, suhdistanti- 

 bus, regulariter, crescentibus ; sublent deyantissime, tenuissime decussata. 



M. shell whitish, curvately oblong, anterior slightly 

 flexuous, abruptly truncate, left valve venti'icosely convex ; 

 right valve distinctly concave, concentrically striate with a 

 few round, somewhat broad, sub-distant ridges, which 

 increase regularly towards the margin, and very finely and 

 beautifully decussate with unduljxtiug striae. Long. 17. Lat. 

 13. Alt. 4. 



This very distinct species of Myadora has more afiinities 

 with the Australian If. pandorarformis tlian any other, but it 

 has no movable testaceous appendage, and the valves are both 

 distinctly striately ridged. Hab. Long Bay. 



Myodora albida, n.s. M. testa albida, translucida, subquadrata oblonga, 

 subconvexa, antice latissimi truncata ; concentrice striata ; striis elevatis, 

 rotundatis, regularibus, paucis, prope marginem antlcam angidatis. 



M. shell whitish, translucent, subquadrately oblong, sub- 

 convex, very broadly truncate anteriorly, concentrically striate, 

 striae rounded, raised, regular, few, angulated near the anterior 

 margin. Long. 10. Lat. 6. Alt. 2. 



A very pretty species, differing from the last in its sub- 

 quadrate form, and its convex valves, which are both regularly 

 and distinctly striate, Hab. Long Bay. 



Anapa tasmanica. n.s. A.t. crassa, trvjona, gibbosa, cequivalvi, antice 

 rotundata postice angulata et planata, sordide alba, concentrice tenue sulcata^, 

 versus marginem epidermide olivacea induta; umbonibus parvis^ incurvis 

 obliquis distantibus ; arm, ligamentali parva, inconspicua, aperta ; pagiiia, 

 interna nivea nitente, sinu palli nulla. Long. 19. Lat. 19. Alt. 16. 



A. shell thick, trigonal, gibbous, equivalve, rounded anteri- 

 orly, angulated posteriorly and flattened, sordidly white con- 

 centrically finely sulcate, clothed with an olive epidermis 

 towards the margin ; with small incurved distant umbones, 

 ligamental area small, inconspicuous, open, interior surface 

 snowy white and shining, no pallial sinus. 



This shell appears to me to have been confounded with A. 

 smithii and A. triquetra, which is a synomym of Gray. 

 That shell is not found in Tasmania. It is, however, a much 

 smaller and thinner shell, less tumid and more trigonal, with 

 very much the appearance of a Cyclas. I cannot find that it 

 has been described. 



