Semipallium amicum (E. A. Smith, 1885)
SMITH, E. A. 1885. Report on the Lamellibranchiata collected by H.M.S. Challenger during the years 1873-76. In C. W. Thomson & J. Murray: Report on the Scientific Results of the Voyage of H.M.S. Challenger during the years 1873-1876. Zoology, 13: 1-341, pls. 1-25 [p. 301, pl. 21, fig. 6]
1885 Pecten amicus E. A. Smith, 1885
E. A. Smith, 1885, plate 21.
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«Testa compressa, aurantiaco-rufescens, umbones versus albida, costis octo latis rotundatis, liris pluribus tenuibus squamulatis ornatis, instructa; interstitia profunda, angusta, minute et pulcherrime reticulata. Auricula postica valvae dextrae minima, antica mediocriter magna, inferne haud profunde sinuata, antice oblique curvata, liris radiantibus tenuibus circiter sex, incrementique lineis sculpta.
Only a single valve of this species, and that evidently immature, is at present known. The sculpture being so remarkable, I do not hesitate to describe it as new.
It is narrow, compressed, slightly unequal sided, the posterior slope being a little longer than the anterior, and like it nearly rectilinear, together forming an apical angle of about seventy degrees. It is of an orange-reddish tint, gradually paler towards the umbones, and has eight broad rounded ribs which are moderately elevated, and ornamented with several very slender prickly-scaled lirae. The grooves between the ribs are narrow, deepish, and ornamented with an excessively fine regular square-meshed network. The auricles are very unequal, the posterior being very small indeed, whilst the anterior (in the right valve) is fairly large, obliquely curved in front, not deeply sinuate beneath, and bears about six fine radiating liroe, which are crossed by the lines of increase. The interior exhibits more or less of the external tinting, which, however, in a more mature shell, would probably be less vivid. Length 12 mm., height 14½, probable diameter of the perfect specimen 4. Habitat.— Station 172, off Nukalofa, Tongatabu, in 18 fathoms. Pecten tigris and Pecten pes-felis are rather like this species in general appearance, but differ in the detail of the sculpture, both of them being finely lirate in the sulci between the ridges and sculptured with a difterent microscopic ornamentation.» EDGAR ALBERT SMITH, 1885
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