20 NILS HJ. ODHNER, MOLLUSCA. 
M. plumescens Dunker (PI. 1, fig. 11). 42 miles W. 8S. W., 42 feet, 1 sp. 
(5/7), 1. 35 mm; 45 miles W. S. W., 84 feet (**%/7), 10 sps, max. 1. 7 mm. 
Though the first specimen is in no other respect unlike the European M. barbata 
than that it has a longer upper margin, which forms a sharp angle to the hind 
margin, it must be referred to the present species, which is very like M. barbata 
but is distinguished from it by most authors. In its long ascendant dorsal line 
it is more similar to the figure given by Ciessin (MARTINI & CHEMNiItTz, Conch. 
Cab. 8:3, fig. 8, 9, Taf. 33) than to the specimen figured by Lynee (1909, Tab. 
Il, fig. 18, 14). The prominent angle is certainly a variable characteristic. The 
young specimens from 84 feet in depth have dense but yet simple hairs and a 
greenish colour. For the synonymy and distribution (Java to Viti und Samoa Isl.) 
see Lyner, 1909. 
Modiolaria cumingiana (DuNKER) Reeve. 45 miles W. 8. W., 72 feet ("'/7) 
from the mantle of ascidiae, 1 sp., 1. 26.7 mm. The shell differs somewhat in shape 
from the figure given by Rerve (Conch. Icon. 10, pl. EX, fig. 63), but the sculpture 
and colour are typical. The form is rhomboidal and the length nearly twice the 
breadth; a prominent diagonal thick costa runs from umbo to posterior inferior angle; 
the anterior and the posterior area are radiately sculptured, the former with 8—l0 
rather distant flattened ribs, the posterior one with denser similarly flattened ones 
about 18—20 in number (thereof about 5 or 6 in front of the diagonal costa); the 
median area is smooth, but finely and indistinctly radially striated. The umbones 
are rather prominent, but a little retracted from the anterior margin. Colour horny 
greenish brown. Inferior margin convex, slightly sinuous at the boundary rays of 
the lateral areas. The inside is simply margaritaceous with translucent striation. 
M. cumingiana differs from M. iimpacta HERMANN in its more lengthened shape, 
and in the nature of its sculpture, the anterior rays of M. impacta being granular, 
here smooth. From M.cuneata Gouup it is distinguished by the number of radiating 
cords, which in that species are anteriorly 16, posteriorly 17 (BAarrscn 1915). The 
present species has a distribution from the Red Sea all round the coasts of Australia 
and far beyond them to Natal and Japan (LyNGE 1909). 
M. miranda E. A. Smrru, 1884 (Rep. Zool. Coll. Alert). 42 miles W. 8. W., 70 
feet (*°/s), 1 sp., L 5.2 mm. This species, which was first found in Dunda Strait by 
the Alert expedition, was recently recorded by Lynau(1909)from the Gulf of Siam. 
It is easily recognized by the fine concentric lines covering all the shell and crossing 
the radiating ribs, making them granulose. The median area is even, finely reticul- 
ated. Colour green or red with red zones. 
Lithodomus gracilis Puinirrt. 45 miles W. S. W., 48—70 feet, boring the 
pearl mussle shells (°/7), 2 sps, max. l. 34 mm; 42 miles W. 8. W., 70 feet (7/5), 
2 sps, max. l. 40 mm, deeply bored down in the pearl mussle shells. The shells 
show the characteristic typical of this species, the striated area being extended 
