562 



Back and sides of the foot ornamented with milk-white tubercles 

 Catania J Panormi. 



Sp. 2. D. aphysia forme, Belle CMaje, Mem. I. p. 190, t. xiii. 

 Coriaceum, Meek. Eidotliea marmorata, Risso. Acera carnosa, 

 Cuvier. 



D. corpore supra pallide fusco, nigro-reticulato ; suhtiis atro- 

 violaceo ; lateribus azureo s. viridi marmoratis. 



Body above pale fuscous, reticulated with black ; beneath 

 blackish violet ; the sides marbled with azure or green. 



Naples. 



Genus 20. Gasteropteeon, Meekel. (Animal, pi. cxix. 

 f. 15.) 



Corpus ovatum, inferne alam, antice velum gerit. Velum 

 capitis e membrana triangulari parti anticse pedis superposita 

 formatur. Pes expansionem transverse ovatam, antice et postice 

 retusam, vix emarginatam antice, verb in parte mediana productam, 

 format. Anus pone brachiam, porus genitalis ante brachiam 

 jacet. 



Body ovate, with a veil anteriorly, and a wing-like foot below. 

 Veil of the head formed by a triangular membrane placed above 

 the fore part of the foot. Foot forming a transversely ovate 

 expansion, retuse anteriorly and posteriorly, slightly emarginate 

 in front and produced in the middle. Anus behind, and genital 

 pore before, the gUls. 



Sp. G. Meckelii, Kosse, Dissert, de Pteropod. ord. Bl. Malac. 

 pi. xlv. f. 5. Clio amati, Delle Chiaje. 



Genus 21. Atlas, Lesueur. (Animal, pi. cxxix. f. 17.) 



Caput lobis parvis duobus tentacularibus. Corpus in partibus 

 duabus divisum. Pes dilatatus, circularis, margine ciliato. 



Testa nulla. 



Head with two small tentacular lobes. Body divided into two 

 parts by a narrow peduncle. Foot dilated circularly and ciliated 

 at the margin. 



Shell none. 



Atlas Peronii, Blainv. 



