it) 
— 
bo 
146 
Chione (Omphaloclathrum) marica L. (Sow.). 
(Pl. V, Figs. 1—4). 
Venus marica, Linnazus, Sowersy, Thesaurus Conchyl., II, p. 719, No. 47, pl. 157, fig. 108 
Between Koh Riot and Koh Mesan, 3—5 fathoms, sand ('/2). N. of Koh Kahdat, 
4—5 fathoms, coarse sand (2). W. of Koh Kut, 15 fathoms, mud (1). 
Long. 8—19 mm. 
Distribution ? 
Epa. Smiru says in the report on the Lamellibranchiata of the Challenger 
Expedition (p. 125) “This species (Venus (Chione) marica L.) is so well known that 
it is unnecessary to give further references than those above mentioned.” This may 
be true as regards the name, because from as far back as the times of LinnE and 
Cuemnirz it has constantly been recorded and mentioned from many localhties all 
over the globe; but a comparison of the descriptions and figures given by LINNE, 
CHeMNitz, SOWERBY, REEVE and others leaves an impression of great uncertainty: 
with regard to the characteristics and limits of the species. For instance, it appears 
lo me that LinNE-CHEMNITz’s species can scarcely be identical with SowerBy’s Ch. 
marica, Thes. Conchyl. fig. 108 (Epc. Smiru’s species Ch. recognita is undoubtedly 
also frequently confused with Ch. marica). All the individuals from the Gulf of 
Siam agree precisely with Sowersy’s figure 108, but how far that is identical with, 
or is a form of LinNE’s Ch. marica is perhaps doubtful. I have given a figure of 
the specimens from the Gulf of Siam to fix the form for future comparisons. The 
specimens from Morrke’s collection, from which Cuemnirz had his figures 282—84 
made (PI. 27 in the “Conchylien Cabinet”. Figs. 285—86 scarcely belong here), exist 
no longer in the Motrke collection included in the Zoological Museum of the 
University of Copenhagen, so I have not been able to compare CHEMNITZz’s specimens 
with mine from the Gulf of Siam. Srurany' is inclined to regard “Venus Rémeriana, 
Issel,” from the Red Sea, as a young form of Ch. marica L. 
Chione (Omphaloclathrum) recognita, E. Sm. 
Venus (Chione) recognita, Epc. Smiru, Report on the Lamellibranchiata of the Challenger Expedition, 
1885, p. 125, pl. 3, fig. 5. 
—  Marica, REEVE p. p., Concholog. icon., XIV, 1868, Venus, fig. 104a (non 104b and c¢). 
Koh Kahdat, sand, 1—5 fathoms (70). N. of Koh Kahdat, 4—5 fathoms, sand (14). 
Koh Mak, sandy coast (7/2). S. of Koh Mak, 5—6 fathoms (2). W. of Koh Kut, 15 
fathoms, mud (4). 
Long. 65—20 mm. 
Long. 20 mm., alt. 15 mm., crass. 10 mm. 
— 17mm. — 135 mm. — 85 mm. 
Distribution: — Suvativa Atoll (Maldive Archip.), Philippines. — Mast Head 
Reef, Queensland (HEDLEY). 
' Lamellibranchiaten d. Rothen Meeres, 1899, p. 27. 
