156 



canaliculate, concave, with both margins beaded, within the 

 naargias 3-4 Urate ; lirse ornamented with round shining 

 granules, interstices very finely obliquely striate, last whorl 

 acutely angulate and margined ; base flat, spirally granulosely 

 lirate ; aperture obliquely squared ; outer lip Urate within ; 

 columella unideutate and corrugated; umbilical margin spirally 

 dentate. 



One specimen. A very distinct white shell with monili- 

 ferous whorls rising in stages. 



Cylichna atkinsoni. n.s. C. t. parva, cyl'mdracea, angusta, tenui, 

 ferruginea, spira umbilicata, occulta, tenuissiine long, et transversim 

 striata, sordide alba ; labro tenui, acuto, medio coarctato, antice sub- 

 dilatato ; labio angusto, reflexo. Long. 4^. Lat. 2. 



C. shell small, cylindrical, narrow, thin, ferruginous, spire 

 umbilicate, hidden, very slenderly lengthwise and transversely 

 striate, sordid white, outer lip thin, acute, drawn in at the 

 middle, and sub-dilate anteriorly ; inner lip narrow, reflexed. 



Long Bay, not common. A very small shell, brought up 

 occasionally by the di'edge from 10 fathoms ; sandy bottom. 

 Eev. H. D. Atkinson. The other Tasmanian species is G. 

 arachis, which is Australian also. In its young state it can 

 always be distinguished from the foregoing by the dense undu- 

 lating transverse striae with which it is covered. 



Aplysia TASMANICA. U.S. A. t. tcnui fragili, translucente, nitente, 

 oblique subquadrata, ienuiter concentrice striata, et transversim minute sul- 

 cata ; intus subtestacea, leviter concava, encausta, cornea ; apice vix in- 

 curve ; margine superiori subrejlexo, arcuato ; margine inferiori obliquo 

 recto, antice producto, rotundato. Diam. mag. 38, transversim diam. 

 max. 28 mil. 



A. shell thin, fragile, translucent, shiny, obliquely subquad- 

 rate, slenderly concentrically striate and transversely minutely 

 sulcate, subtestaceous within, slightly concave, enamelled, 

 horny, apex scarcely incurved, with the upper margin arcuate 

 and subreflexed ; lower margin obHque and straight, anteri- 

 orly produced and rounded. 



A large form of talcous appearance, the margin becoming 

 insensibly membranaceous. It is somewhat similar in form to 

 A. gigantea, of Sydney, but more oval, membranaceous, and 

 smaller. 



AcivLEA MARMORATA. U.S. A. t. quodrato-oblouga, postice dilatato, 

 depressa, sordide oUvacea, apice eroso vel acuto, submediano ; costis 8-10, 

 rudis, erosis, radiantibus, distantibus ; intus nitente conspicue variegata, 

 radiis luteis concavis, interstitiis atrofusciss ; spathula nigerrima, margine 

 albo, atro-punctato conspicuo. Long. 2L Lat. 15. Alt. 6. 



P. shell quadrately oblong, dilate behind, depressed, sor- 

 didly olive ; apes corroded or acute, submedian; ribs 8-11, 

 wide, corroded, radiating and distant ; within shiny and con- 

 spicuously variegated, with white rays and very black broad 



