OCR Text |
Show °80'] MR. E. A. SMITH ON NEW SHELLS. 481 spiraliter striati, inferne tenuiter costati. Anfr. ultimus infra medium contractus, in medio zona alba. Columella plica sub-tuberculiformi superne instructu. Long. 45 mill., lat. 7. Hab. Japan (Mr. Maries). The nodules of the upper row are larger and much more conspicuous than those of the lower; the latter are oblique and separated from those above by an impressed line. The costae are not much elevated a little arcuate, and correspond in number (about 20 on a whorl) and position with the tubercles. The lower half of the volutions, or that occupied by the ribs, is spirally striated, the striae being continuous over the costae, and not equidistant The interstices between the nodules also show indications of spiral lines The reddish-brown variegation takes the form of longitudinal oblon* blotches, which are further apart upon the upper volutions than upon the lower ones. The upper series of granules is comparatively free from brown maculations. The costae upon the last whorl extend to the base, where they become obsolete. The columella is covered with a callosity, and towards the upper part exhibits a nro-minent plica. r ^ I take this opportunity of changing the name of a species described by me in the ' Annals and Magazine of Natural History,' ser 4 vol. xi. p. 267(1873), as Myurella belcheri, as that name had already been employed by Philippi for another species. In its stead I now propose guayaqmlensis, as the type specimen was collected by Sir Edward Belcher at Guayaquil, in Ecuador. TROPHON STUARTI. (Plate XLVIII. fig. 6.) Testa breviter fusiformis, alba. Anfractus 7, superne planati et angulah lateribus planis, costis late lamelliformibus, aliquanto obliquis, erechs, superne ad angulum valde sursum productis dextrorsumque curvatis, costis transversis (in anfr. superioribus 2-3, in ultimo 4) cequidistantibus, et supra longitudinalibus continue mstructi. Apertura irregulariter ovata, inferne in canalem producta. Canalis curvatus, retrorsus, aperturam fere cequans. Columella leviter arcuata, callo tenui extus libera induta. Labrum expansum, costa ultima lamelliformi extus munitum.' Long. 53 mill., diam. 21. Aperturae (cum canali) long. 31 lat intus 10. ' Hab. Vancouver's Island (Cutter). This is a pure white shell, remarkable on account of the thin lamellae which adorn it. At the upper part, at the angle of the whorls, these are much prolonged upwards, hollow on one side, ridged on the other, and curved to the right. Of the spiral lirae' that at the angle is rather stouter than the rest. Upon the upper whorls they are proportionally more elevated than upon the last, and, with the longitudinal lamellae, form a coarse reticulation. Upon the body-whorl, towards the lower part, they cease to be erect are lapped one upon another, and form an imbricated caudal ridge subparallel with the canal. The entire surface is both spirally and |