550 



CiTTALOGUE — SHELLS. 



18. Terebratula FLEXUOSA. 



T. testd rotundatO'Cordatd, gibbd, sub-fused, longitudinaliter creber- 

 rime sulcatd; margine valde Jiexuoso ; long.l^; lat. 1^ paulo 

 minus; poll. 



Habitat in freto Magellanico (Port Famine). Mus. Brit,, nost., 

 Brod. 



This shell, which was dredged up from deep water in the bay 

 of Port Famine, attached to stones, is not a common shell in the 

 Strait. 



19. Terebratula Sowerbii. 



jT. testd subrotundd, planiuseuldf subjused, longitudinaliter radiatim 

 transversim substriatd, medio superne depressd, infra conveocd, sub- 

 glabrd; margine utrinque crenulato, medio glabro ; long. 1-^^ ; 

 lat. paulo plus; alt. J j poll. 



Habitat in freto Magellanico, Mus. nost., Geo. Sowerby, 



20. Chiton setiger. 



C. testd ovali, antice subattenuatd ; valvis subdentatis, tenuiter con- 

 centrice striatis, anticd lO-radiatd, posticd Icevi, parvuld ; areis 

 lateralibus striis duabus elevatis marginalibus ; ligamento mar- 

 ginali Icevigato, setiger o; long. 2| ; lat. If ; poll. 

 Habitat ad oras insulce Tierra del Fuego et in freto Magellanico. 

 Mus. Brit., nost., Brod. 



Shell ovate, rather attenuated towards the anterior end, generally 

 of a light blue-green colour, variegated with markings of dark 

 slate. Valves slightly beaked with minute concentric striae, the 

 lateral compartments with two marginal ridges, which in some 

 specimens are granulose, in others smooth. The anterior valve has 

 eight, besides two marginal, ridges of the same character ; the pos- 

 terior valve is very small and smooth. Border coriaceous, and set 

 with bristles produced from three rows of tufts or pores. In some 

 of the specimens in my possession the bristles are rubbed off. 



The shell is found in all parts of the shores of Tierra del Fuego, 

 particularly on its seaward coast, and the western parts of the Strait 

 of Magalhaens. 



21. Chiton Bowenii. 



C. testd oblongo-ovatd, castaneo-rifd ; dor so elevato; valvis subden- 

 tatis, sublcevibus concentrice tenuiter striatis; areis lateralibtis 

 radiatim sulcatis ; ligamento marginali granuloso, nigro ; his^. 

 3f ; lat. IJ; poll. 



