. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 376 Mr. E. A. Smith on the Genera In the words of the original describers of this species, it tl is allied to T. erosa, Couth., but is easily recognized by the longitudinal ribs and by its more slender form " (Mighels & Adams). The two forms are considered by Aurivillius to constitute one species, and he describes and figures a very different shell under the varietal name declivis *. Judging from the figure, however, it certainly looks quite distinct. The whorls are r
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 376 Mr. E. A. Smith on the Genera In the words of the original describers of this species, it tl is allied to T. erosa, Couth., but is easily recognized by the longitudinal ribs and by its more slender form " (Mighels & Adams). The two forms are considered by Aurivillius to constitute one species, and he describes and figures a very different shell under the varietal name declivis *. Judging from the figure, however, it certainly looks quite distinct. The whorls are remarkably convex, without spiral or longitudinal costse, and much higher in proportion to their width, and, in addition, the peristome is entire. Without examining a speci- men I must refrain from suggesting the generic position of this shell. Tachyrhynchus lacteola (Carpenter). 1864. Mesalia lacteola, Carpenter, Report Brit. Assoc. 1863, pp. 603, 655, name only. 1865. Mesalia lacteola, id. Proc. Acad. Nat. Sci. Philad. p. 62. Hah. Puget Sound and Vancouver Isl. (Cpr.). This species has been considered by Tryon synonymous with T. reticulata, but in my opinion it is quite distinct. Besides being smaller and shorter, the sculpture is more nodulous and the form of the aperture is different being Fur. produced and effuse at the base. The character of the operculum, however, at once distinguishes the species. It is horny, roundly ovate, but pointed above, slightly concave, consists of only 4-5 whorls, which increase rather rapidly, are carinate at the sutures, and marked with conspicuous lines of growth, and the nucleus is a little excentric. As already pointed out, that of T. reticulata is circular, multi- spiral, consisting of nine whorls. * Vega-Exped. Vetensk. Jakttag. vol. iv. p. 324, pi. xii. fig. 9 (1887).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustr
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