55 



Mytilus cbassus. Tenlson- Woods. 



MoDiOLA AUSTRALis. Gray, A2:)pendix to King^s Voyage in Australia, 

 p. 477. Short and contracted posteriorly or convexly dilated anteriorly, 

 sparingly bearded. Common, and in Australia, north and south. Often 70 

 to 80 mil. long. Every conchologist has doubts whether this shell is distinct 

 from M. tidipa. Knowing what we now do of the range of shells, I am 

 inclined to think it is not. 



MoDiOLA ALBicosTATA. Lamar ck Vol. 7, p. 19. Large, smooth, shining, 

 dark chestnut, with darker rays. The central white rib described by Lam. 

 is only seen on worn specimens. Common. Long. 71 (?), lat. 31, alt. 25. 

 Var. 1. polita ; var. 2. nehulosa, MiM. 



MoDiOLA ARBORESCENS. Chemnitz Conch. Cah., Vol. 2, p. 198, Jig. 2016 ; 

 Lamarck (M. picta), Vol. 7, 2^^- 21 ; Soioerhy, Genera of Shells fig. 1 (the 

 latter the best figure) ; also Reeve. A flattened yellowish white shell, 

 clouded with red and arborescent black markings on the edge. Very rare. 

 Long Bay, Kev. H. D. Atkinson. About 45 mil. long. 



MoDiOLA cuMiNGiANA. Dunhcr, MS. Mils. Cum. teste. Reeve, Icon., 

 pi. 9, fig. 63. Oblong, wedge shaped, curved, gibbous, tumid anteriorly, 

 finely striated and obtusely angled, but conspicuously smooth in the middle ; 

 dark, horny with shining periostraca. Not common. Long. 14, lat. 22, 

 alt. 12. Long Bay, Kev. H. D. Atkinson. Tamar Heads, W. F. Petterd. 



Vulsella tasmanica. Reeve, Icon. pi. l,fig. 3. Pale, horny, squamose, 

 and closely striate, uncouth and very variable in shape. Eelative measure- 

 ments vary, as it takes every shape. About 30 to 18 is the average. 

 Common, and S.A. 



AvicuLA pulchella. Reeve Icon., pi. 8, fig. 22. "An exceedingly 

 transparent shell, curiously painted with interrupted rays of black spots, 

 narrow red flames, and fine opaque white spots." — Reeve. Very variable, 

 the brown and white spots alone visible sometimes. Common, and V., and 

 all the East Coast of Australia, Said to occur in the Philippines. In 

 Tasmania it is almost always found on seaweed. Long. 23, lat. 3, alt. 11. 



Pinna tasmanica. Tenison- Woods. 



Order Pectinace^e. 



Trigonia margaritacea. Lamarch, Vol. 6, p. 514. The largest of the 

 few Australian Trigonice, and the only one found in Tasmania. 



Arca trapezia. Besh. {lohata, Reeve.) Very plentiful, Tamar Heads, 

 at low water, not found on the south side of the island. Foimd also in W. 

 Indies. 



Arca fasciata. Reeve Zool. Proc, 1844, p. 125, and Icon., pi. 15, 

 fig. 99. Closely ribbed, and transversely finely striate, shell white with 

 faint brown, transverse bauds, and having periostraca on the edges. 

 Common. Islands in Bass' Straits, S. Tasmania, Tamar Heads, always much 

 worn. Long. 27, lat. 51, alt. 18. 



Pectunculus radians. Lamarch, Vol. 6, p. 495. A reddish rayed 

 ribbed shell, very common here, and in S.A. Long. 34, lat. 37, alt. 21. 



Pectunculus obliquus. Reeve ? N.E. Coast. 



Pectunculus flabellata. Tenison- Woods, Trans. Roy. Soc. Vict, 

 1877. 



NucuLA grayi. D^Orhlgny, Amerique Meridionale, p. 53. Ovate, very 

 transverse, acuminate at both ends, thin, inflated, very smooth, oHve and 

 shining. Very rare. Long Bay, Eev. H. D. Atkinson. Reeve gives New 

 Zealand as the habitat, but it is not known there. 



NucuLA MiNUTA. Tenison- Woods. 



Leda crassa. Hinds, Zool. Proc, 1843, 2^. 99 (descr. Nucida). Solid, 



