43 139 
siderable enough to decide the question. — The specimens from the Gulf of Siam, 
which agree most closely with the form figured by Reeve in PI. I, Fig. 5b, 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, Dunker, MS. Mus. Cuming. 
— - _- Reeve, Conchol. icon., X, 1857, Modiola, Sp. 50. 
Modiolaria — — Martini u. CHEMNITZ, Conchyl. Cabin., VII, 3 Abth., p. 146, pl. 34, figs. 2—3. 
_— cumingiana, — Epa. Smiru, Report Challenger Exped. Lamellibranchiata, 1885, p. 278. 
Koh Kram, 20 fathoms (*/2). Between Koh Riot and Koh Mesan, 3—5 fathoms, 
sand (1). 
Long. 8—11 mm. 
Distribution: — Karachi (MEtvitt & STanpeEN), Gulf of Aden (SHopLanp), 
Red Sea (SturaAny), Mauritius (Lrmnarp), Natal (Epc. Smirna). — Japan (DuNKER 
and Srearns). 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, GouLp, Proceed. of the Boston Soc. of Nat. Hist., VIII, 1861—62, p. 38. 
Epa. Smiru, Lamellibranchiata of the Challenger Exped., p. 278, pl. 16, fig. 7. 
PrivcHarp and Gariirr, Proceed. Roy. Soc. Victoria, vol. 17, pt. 1, 1904, p. 254. 
Koh Kahdat, 1—2 fathoms (1). 
Long. 4 mm. 
Distribution: — Port Jackson, Sydney (“Challenger”), False Bay, Cape of Good 
Hope (Goutp). “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. Il, Fig. 15). 
Lanistina nana, DunKeErR, Proc. Zool. Soc. London, XXIV, 1856, p. 365. 
Modiola — — Reeve, Conchol. icon., X, Modiola, Sp. 56, pl. X, fig. 69. 
Crenella oa — Cvessin in Martini u. CHEmNiTz, Conchyl. Cabin., VII, 8 Abth., p. 152, pl. 34, 
fig. 10. 
1 Journ. de Conchyl., vol. 13, 1865, pp. 122—123, Saviany, Descript. de l'Egypte. Coquilles, pl. XI, 
fig.3. A. H. Cooke (Ann. and Mag. Nat. Hist., Ser. 5, vol. 17, p. 141) considers it to be identical with 
Mod. marmorata, Forb. Epc. Smirn (Proc. Zool. Soc. London, 1891, pp. 393—94) thinks, however, that 
Cooke is wrong in this. Sowrrsy (Marine shells of South Africa, p. 65) has specimens from Port Elizabeth. 
18° 
