171 267 
I cannot find sufficient reason for separating the two forms tunicata and 
scaphoides as distinct species, the differences are entirely individual. Among the 
rather large quantity of material which I have at my disposal, are several transitional 
forms. The vivid coloration which Hrnps has given in his figure of funicata in 
the report of the “Sulphur” Mollusca, was not found by me in any of the indi- 
viduals I have had for examination. 
Corbula (Aloidis) erythrodon, Lam. 
Corbula erythrodon, Lamarck, Hist. nat. d. anim. s. vert., V, 1818, p. 496, No.3. — éd.2, VI, p. 138, No.3. 
— — - Reeve, Conchol. icon., II, Corbula, Sp. 4. 
—_ = — Liscukk, Japan. Meeres-Conchyl., I, p. 136. 
E. of Cape Liant, 9 fathoms, shells ('/2). N.of Koh Kam, 5 fathoms, gravel (2). 
Between Koh Riot and Koh Mesan, 3—5 fathoms, sand (1). Between Koh Mesan 
and Cape Liant, 9 fathoms (1). Koh Kahdat, 1—5 fathoms, sand (2 +- */z). Between 
Koh Kut and Koh Kahdat, 10 fathoms, shells (*/2). 
Long. 7—20 mm. 
Distribution: — Poulo Condor, China, Japan, New Zealand. 
Corbula pallida, Hinds (recorded from Singapore and the Nicobars), is certainly 
synonymous with the present species. 
Corbula lineata n. sp. 
(PI. V, Figs. 23—24). 
This species is oblong-triangular in form, somewhat inequivalve (the right 
valve being somewhat larger than the left), moderately convex, the valves thick and 
solid, and whitish in colour with slight indication of pale red. The umbo is 
situated at about the middle, often nearer to the front end. The apices of the 
umbones are placed close together and they curve over towards the front. From 
the umbo a sharp keel extends over each valve down towards the posterior ex- 
tremity, which is prolonged in a rostrum-like manner. The dorsal margin slopes 
gradually down towards the front end, from whence it is continued in a curve 
down to the straight ventral margin. Towards the pointed posterior end the dorsal 
margin slopes in a straight line. In both valves, when the animal has reached a 
certain size, the ventral margins turn back and grow inwards towards each other. 
The portion of the posterior end which is bounded by the two keels forms an 
oval; towards the central line (the opening between the valves) of this oval there 
occurs on each side a smailer keel, by which another oblong oval is formed. 
The surface of the valves is covered with close-set, concentric, raised thread-like 
lines, the interstices between which are finely striped transversely with close-set 
radiating lines. The interior of the valves is white, the muscle impressions and 
the pallial line are yellow; a narrow depression extends from the umbonal region 
down towards the ventral margin. The solitary cardinal tooth in the right valve 
is large, strong and curved upwards; it fits into a corresponding pit in the left 
valve, behind which there is a large denticle supporting the ligament. 
34° 
