Dr. A. Giinther on three new Ti-achinoid Fishes. 85 The following closely allied species has long stood in my col-lection as H. Planorbis, Lesson; on mature consideration, it appears deserving of separation. Helix Cantoriana, Bens., n. sp. H. testa mediocriter umbilicata, tenui, depressa, orbiculato-conoidea, ^ lenticulari, oblique subarcuato-striata, subtus Iseviore, utrinque lineis distincte incisis remotiusculis spiralibus decussata, fusco-cornea, trauslucente, nitidula; spira parum elevata, depresso-conoidea, apice nucleate, obtuso, rubello, sutura impressa, sub-marginata ; anfractibus 5|, convexiusculis, ultimo carina mediana obtusiuscula utrinque compressa munito, subtus convexo ; aper-tura obliqua, subquadrato-lunari ; peristomate tenui, acute ; umbi-lice infundibuliformi. Diam. major 10, minor 9, axis 3| mill. Habitat in insula Pulo Sung-Sung, prope Pulo Pinang. Detexit Dr. J. E. Cantor. A single specimen was found on the little island in question by the late zealous zoologist Dr. Cantor. It is certainly distinct from H. Sanis'f aiid the peculiar sculpture, independently of other characters, affords good ground for distinguishing it from the recorded species of the same group. Including two Spiraxes, one of which is not in a sufficiently perfect state for description ; a Bulimus, which appears to be the young of the widely spread B. gracilis, Hutton ; a Helix as yet undetermined ; an Auricula ; a Melampus, and a Pijthia, we have now sixteen species of land-shells from the Andaman Islands. Cheltenham, Dec. 21, 1860. XII. — On three new Trachinoid Fishes. By Dr. Albert Gunther. [Plate X. A.] The family of the Trachinida, Gthr., has been established for those Acanthopterous Fishes which have the spinous portion of their dorsal fin much less developed and shorter than the soft, the anal fin similarly developed to the soft dorsal, and the ven-trals composed of one spine and five rays. Their gill-openings are wide, and the caudal portion of their vertebral column is formed by many more vertebra than the abdominal *. Such are the positive characters by which they may be easily distinguished from the Scianidm, Carangida, Blenniidce, Gobiidte, Trichonotidce, &c. ; whilst the negative character, that of the absence of an infraorbital bone joined to the prfeoperculum, * Gunth. Acanthopt. Fishes, ii. p. 225.
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