43 139 



siderable enough lo decide Ihe question. — The specimens from the Gulf of Siam, 

 which agree most closely with the form figured by Reeve in PI. I, Fig. 5 b, have 

 all a dark-brown epidermis and strongly marked, broad, step-like zones of growth. 

 Also forms like Lamarck's Mod. silicula occur frequently. 



Modiolaria Cumingiana, Dunker (Reeve). 



Modiola Cumingiana, Dlnkeu, MS. Mus. Cuming. 



— — — Reeve, Conchol. icon., X, IS.'iV, MorfioZa, Sp. 50. 



Modiolaria — — Martini u. Chemnitz, Conchy]. Cabin., VIII, 3 Abtii., p. 14(i, pi. :U, figs. 2 — 3. 



— cumingiana. — Edg. Smith, Report Challenger E.xped. Lamellibianchiata, I.S.S."), p. 278. 



Koh Kram, 20 fathoms (Va). Between Koh Riot and Koh Mesan, 3—5 fathoms, 

 sand (1). 



Long. 8—11 mm. 



Distribution:— Karachi (Melvill & Stanben), Gulf of Aden (Shopland), 

 Red Sea (Stcrany), Mauritius (Liénahd), Natal (Edg. Smith). — Japan (Dunker 

 and Stearns). Along the north (Torres Strait, and several other places), east 

 (Moreton Bay, Sydney, and several other places), south (St. Vincent's Gulf, and 

 several other places) and west coast (Swan River, and several other places) of 

 Australia. Tasmania (Tate and May). 



Modiolaria cuneata, Gould. 



Modiolaria cuneata, Gould, Proceed, of the Boston Soc. of Nat. Hist., VIII, 1861 — 62, p. 38. 



— — — Edg. Smith, Laniellibranchiata of the Challenger Exped., p. 278. pi. 16, tig. 7. 



— — — Pritchard and Gatliff, Proceed. Roy. Soc. Victoria, vol. 17, pt. 1, 11)04, p. 204. 



Koh Kahdat, 1—2 fathoms (1). 



Long. 4 mm. 



Distribution:— Port Jackson, Sydney ("Challenger"), False Bay, Cape of Good 

 Hope (Gould). "Common Port Phillip, associated with tunicates, Carrum to Frankston, 

 Portsea" (Pritchard and Gatliff). 



Mod. coenobita, Vaillant, from Suez, ' is closely allied to this species. 



Modiolaria nana, Dunk. 



(PI. 11, Fig. 15). 



Lanistina nana, Dunker, Proc. Zool. Soc. London, XXIV, 1856, p. 365. 

 Modiola — — Reeve, Conchol. icon., X, Modiola, Sp. 56, pl. X, fig. 6!). 



Crenella — — Clessin in Martini u. Chemnitz, Conchyl. Cabin., VIII, 3 Abth., p. 152, pl. 34, 



fig. 10. 



' Journ. de Conchyl., vol. 13, 1865, pp. 122—123, Savignv, Descript. de l'Egypte. Coquilles, pl. XI, 

 tig. :i. A. H. Cooke (Ann. and Mag. Nat. Hist., Ser. 5, vol. 17, p. 141) considers it to he identical with 

 Mod. marmorata, Forb. Edg. Smith (Proc. Zool. Soc. London, IS'Jl, pp. 393-94) thinks, however, that 

 Cooke is wrong in this. Sowerby (Marine shells of South Africa, p. 65) has specimens from Port Elizabeth. 



18* 



