8 NILS HJ. ODHNER, MOLLUSCA. 
on gave some illustrations of its mode of attachment and growth (»The Naturalist 
in Australia», London, 1897, p. 249—50). 
Pteria (Margaritifera) maxima Jameson, many specimens, max. diam. (height) 
21 em; one valve with a Pinnotheres attached on the inside and covered by its 
margaritaceous layer. About this species see further below (p. 15). 
Malleus albus Lamarck, 4 shs., max. ]. 254 mm. 
Modiola philippinarum Hanvey, 2 shs, max. 1. 51 mm. 
M. plumescens Dunker, | right valve, 1. 40 mm. Though worn and without 
the characteristic cuticular hairs, it proves by comparison with a specimen from 
Cape Jaubert to belong to this species because of its rough growth strigations. 
Anomia (Patro) elyras Gray, 9 upper valves, max. |. 62 mm, which seem to 
agree best with the figure of A. elyros in Rrive (Conch. Icon. 11, 1859, fig. 3). 
Spondylus victoriae Sowrrey var. wrightianus Crosss, | sh., 1. 110 mm (enclosed 
the spines). For this species cf. E. A. Smiru, 1884 (Rep. Zool. Coll. » Alert»). 
Arca navicularis Brucurire, 1 right valve, worn, 1. 38 mm. 
A. granosa Linnté. In mangrove mud on the shore, many specimens, max. 1. 
44 mm, and one shell thrown up on the beach (*'/; 1911). The specimens differ in 
showing a more produced posterior shell-end from fig. 12 in ReEve’s Conch. Icon. 2, 
1843. Further the present specimens differ from the type in the acuminated corner 
between the posterior and inferior margin, through which the form becomes more 
oblique and the radiating ribs running to this point broader than the remaining ones 
(in the typical form, the broadest ribs are in the median part of the shell); the ribs 
above the corner are, further, lower than those of the typical form and have no 
knobs; the umbones are somewhat narrower and higher; the breadth of the hinge 
margin is greater than in the type. The number of ribs is 20, and nr 13—15 is 
the angular rib. This variety seems to be most like A. cuneata Rerve (fig. 37, 
Conch. Icon. 2) which is stated to occur at Zanzibar. Lamy (1907) finds that »les 
spécimens qui portent ce nom d’A. cuneata dans les collections du muséum [Paris], 
et qui proviennent d’ Australie et de Ceylan, sont simplement des échantillons de gra- 
nosa>» (p. 213), an opinion that makes me more convinced in my view that the 
present specimens belong to the same species. — Its distribution ranges from Bom- 
bay to the Philippines and Japan (LyNGE 1909). 
A. decussata Sowrrsy, | sh., 1. 33 mm. 
Pectunculus radians Lamarck, 3 shs, max. |. 15 mm, show agreement with 
typical specimens from Australia in the State Museum. 
Tridacna squamosa Lamarck, | sh,, |. 25 em. 
Cardium elongatum Brucurmre, | sh., 1. 84 mm. 
