438 Gastropoda. — Pteropoda. 



radula 7. 1. 7, dente medio tricuspide; sacci liamuligeri hamulis oU — 40. — Long-. 

 ad 10 mm. 



Distrib.: Atlanticum, in salo. 



Habit. : Alger: Delh's, La Calle; Tunis (Mehcike et Al-capitaixk); Messina 

 (Gegkni!aui{, Khuhn); Adiia: Trieste, frequ. in autumno (E. Graeffe, in litt.). 



Pneumodermon Cuv. {Acyle Okex). Corpus ovatum, longiuscuhnn, post 

 paullo contracfuni aut rotunclatuni ; viscera extremifatetn posticam attinffoitia; cutis 

 pKjmcnfo x)rae(lita; caintt perlongum aut corpori collolomjo junctum ; pcs loho postico- 

 post rotundato, lohis anticis capiti tota Jonc/ifudine affixis, intcr eos fuhercutum parvum 

 plicatum; hranchia lateralis ef posterior quadriradiaia ; prohoscis appendiciljus duahus 

 infero-lateraUhus, compressis, acefahtda pcdunculata ferentihus; radula in adultis sine 

 dente mcdio; sacci liamidigcri hamulis valde nnmerosis. 



1. Pn. mediterraneum Vax Bex, {Pn. Feronii Soul., Costa, Tib., Pn. 

 macrocoti/Utm Boas, Pit. AndcfMirdi Loc). Cristae radiantes branchiae posterioris 

 longae, fimbriis nuraerosis, divisis; utraque appendix acetabulifera , acetabulis 7 

 magnis marj^ini insertis; lobus posticus pedis perlongus; branchia lateralis brevis; 

 radula (i. 0. 6; violaceo-fuscum. — Long. ad 17 mm. 



Distrib. : Atlanticum et Sinense. 



Habit. : Marocco: sin. Ceuta (Mercier et Aucapitaine); Nizza (V£rany); 

 Xapoli (Custa, Tiberi); Messina (Gegenbaur). 



w 2. Pn. violaceum Ggbr. (nec d'Orb.) (larva: Trizonius coecus Busch). 

 ^Corpore viohuco . lnaiKliiae tribus lamellis ad posticam corporis partem; 

 branchia lateralis dextra; acetabulis utroque hitere 10—14. Long'. 14 — 18 mm~ 

 (Ge(jenbaur). 



Habit. : Malaga (larva) (Busch); Messina (Gegenbaur); Adria: Trieste 

 (larva) (J. Muller). 



VjiRANY Pn. violaceum „Vanb." inter species Genueuses enumerat. 



2. Fam. CLIONOPSIDAE Costa [CUoidca Gubr. p.). Proboscis perlonga, 

 appendices buccales nullae; mandibula; branchia posterior quadriradiata, lateralis 

 nuUa; cutis sine pigmento; corpus crassum, semipellucidum, doliiforme, post rotun- 

 datum; caput parvum, collo breviusculo, tentaculis lateralibus crassis, brevibus; 

 pes anticus. sine lobo posteriore, inter lobos anteriures tuberculum plicatum : pinnae 

 pro magnitudine corporis parvae; raduhi in adultis dente mediano. 



Clionopsis Troschel (Cliopsis) {Clio Gobr. p.). XotaefamiUae ctiam gcncris^ 

 nnici sunf. 



m 1. CL Krohni Trosch. {CUo nicditcrranca (niBR.; larva: Trichoci/clu!> 

 mediterraneus Costa), Corpus longum, crassuni, caput parvum, tentaculum nuchale 

 valde prominens; lobi anteriores pedis angulis posterioribus rectis; pinnae rotun- 

 datae; raduha: (J. 1. (i; sacci Iiamuligeri hainulis circ. (50; semipellucida, maculis 

 numerosis fuscis. — Long. ad 24 mm. 



Habit. : Napoli (Acton, A. Costa), Ventotene. (ioo m (Chun); ^lessina 

 (Gegenbaur, Thoschel); mare lonicum, in orientf antf ins. Melitam (larva) (Ma(" 

 Donald). 



;>. FauL CLIOXIDAE Pkls. (CUonidor (Jhav i»., CUoidca Ggbr. p.\ Paria 

 2 aut 3 appendicum buccalium cdnicarum; mandibula nulla; bi-anchia nulla; cutis 

 sine pigmento; corjtus elongatum, post attenuatum et acuminatum, viscera in adultis 

 partem dimidiam aiit('ri(»rem tantum corporis occupantia; caput rotundum, breve. 



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