478 Miscellaneous. 



them were indicated loug ago in the fossil state in the Pliocene of 

 Italy, such as Terehratella septata, Leda messaniensis, Limoi^sis 

 aurita, L. minuta, Fleurotonia Loprestiana, Golumhella costulata, 

 Eissoa snbsoluta, Turbo romettensis, Troplion multilamellosus, &c. ; 

 but they also live in the abysses of the Bay of Biscay and on the 

 shores of Portugal. 



Between the dredging 1 (555 metres) and the dredging 5 (1685 

 metres) there is no essential difference from a zoological point of 

 view ; the species of dredging 5 all occur in the bottom of dredging 

 1, but their number is restricted ; we have only recognized about 

 twenty *. 



The dredgings 18 (2454 metres) and 17 (2660 metres) in the 

 north of the Mediterranean, between Provence and Corsica, have 

 also furnished us with MoUusca which existed at the depth of 555 

 metres — Terehratula vitrea, Syndesmya longiealhis, Xylophaya 

 dorsalis, Nuada sulcata, Nassa Edwardsi, Dentalmm agile, &c. 



We may conclude that between 445 and 2660 metres the deep- 

 sea malacological fauna has the same zoological characters, but that 

 the number of species gradually decreases with the depth. The 

 equality of temperature has the effect of rendering the fauna almost 

 uniform. 



In the south of the Mediterranean the principal stations where 

 MoUusca abound bear the numbers 26 (900 metres) and 28 (432 

 metres) along the Barbary coast, between Oran and Gibraltar. 

 Here we collected about sixty species f ; but some of these do not 

 extend so far as the Gulf of Lyons. The remarkable forms are: — 



multilameUa, Isocardia cor, Kelliella miliaris, Lucina spinifera, Necera 

 cuspidata, N. costellata, Xylophaya dorsalis, Syndesmya lonyicallus, Phola- 

 domya Loveni. Scaphopoda : Siphonentalis quinquanyularis, Cadulus 

 ttimidosus, Dentalium agile. Gastropoda : Troplion midtilamellosus, 

 Chenopus Serresianus, Buccintmi Ilumphreysianum, Nassa limata, N. Ed- 

 wardsi, Golumhella costidata, Maryinella claridestina, Cerithiuni metaxa, 

 Eidima stenostoma, E. distorta, Craspedotus Tinei, Turho romettensis, 

 Scissurella crispata, S. costata, Emaryimdajissura, Odostoinia unifasciata, 

 Cioniscus yracilis, Hissoa ahyssicola, R. suhsolvta, Rinyicida leptoddla, 

 Pletirofoma Loprestiana, Hela tenella, Eulimella ventricosa, E. acicida, 

 Aelis Walleri, Cylichna comdus, &c. 



* Terehratula vitrea, Lima elliptica, L. Sarsi, Malletia cuneata, Leda 

 messaniensis, L. striolata. Area pectunculoides, Necera costellata, Xylophaya 

 dorsalis, Dentalium filum, Trophon multilamellosus, Hela tenella, &c. 



t Laaiellibranchiata : Pecten vitreus, Modiola lutea, Limopsis 

 minuta, Area diluvii, Nucida sulcata, N. ceyeensis, Lucina borealis, L. spi- 

 nifera, Axinus yranulosus, A. ferruyinosus, A. hiplicatus, Astarte hipartita, 

 Cardium vnnimiwi, C. papillosum, Venus midtilamella, V. casina, Syndes- 

 mya lonyicallus, Necera abhreviata, N. costellata, Poromya yranulata, Saxi- 

 cava arctica, Saxicavdla pUcata. Scaphopoda: SlphonentaUs quinquan- 

 yidaris. Gastropoda : Murex Spadce, Nassa semistriata, Trophon 

 multilamellosus, Chenopus Serresianus, Taranis Morchi, Pleurotoma Lo- 

 prestiana, Trochus yeminulatus, Zizyphinus Folini, Z. siduralis, Scissurella 

 crispata, Natica fusca, Pissoa ahyssicola, Eidima hilineata, Eulimella 

 scillce, E. acicida, Odostomia conoidea, Pyramidella minuscula, Actceon 

 exilis, Cylichna nitidula, Tecttira fulva, Calyptrcea sinensis, &c. 



