OCR Text |
Show 288 MR. E. A. SMITH ON THE [Apr. 1, cequans; columella basi incrassata producta; labrum incrassatum. Longit. 2§ millim., diam. 1. The apex of this species is very peculiar, being large, smooth, and somewhat uncoiled. RISSOA CALA. (Plate XXI. fig. 21.) Testa ovato-pyramidalis, nitida, mediocriter tenids, albida, lineis vel strigis longitudinalibus undulatis irregularibus picta; anfractus 6, leviter convexi, la?vigati ; apex subacutus, spiraliter tenuissime striatus; anfract. ultimus ad basim albus, haud variegatus, in medio obsolete rotunde subangulatus; apertura rotundata, intus albida; columella fusco tincta; labrum tenue, album. Longit. 3 millim., diam. \\. The brownish markings are irregular in shape and direction, and give most of the specimens the appearance of being mottled with brown and white. Some examples, however, which have only a brownish zone round the middle of the body-whorl, bear considerable resemblance to Barleeia rubra, Montagu. That species has not the same spiral striation on the upper volutions. RISSOA EPHAMILLA. (Plate XXI. fig. 22.) Testa ovato-pyramidalis, laevigata, albida, infra suturam opaco-albo et rufo-fusco maculata; anfract. 6, vix convexi, ultimus ad basim lineis radiantibus fuscis ornatus; apertura rotundata, longit. totius g subcequans; columella fusco-purpureo tincta,; labrum vix incrassatum. Longit. 4 millim., diam. 2. This species must not be confused with R. cala. It is a little larger, somewhat more solid, has rather less convex whorls, and is not coloured in the same way. Both have the columella stained with a brown or purplish-brown colour, and united to the outer lip above by a thin callus. RISSOA GLYPTA. (Plate XXIII. fig. 39.) Testa ovato-pyramidalis, alba vel rufescens, imperforata, nitida; anfractus 6, apicales l&ves, convexi, cceteri superne declives, interdum paulo excavati, in medio aut obtuse vel subacute angulati, infra angulum contracti, liris spiralibus tenuibus cincti, interdum ad angulum plus minus longitudinaliter plicali; apertura rotunde ovata, longit. totius 3 adosquans ; peristoma continuum, margine basali subeffuso, columellari anguste reflexo. Longit. 3j millim., diam. lg. In some specimens the walls are much more angular than in others, and the longitudinal plicae vary also very much in development. |