550 CATALOGUE—SHELLS. 
18. TEREBRATULA FLEXUOSA. 
T. testd rotundato-cordatd, gibbd, sub-fuscd, longitudinaliter creber- 
rimé sulcatd; margine valdé flexuoso; long. 13; 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. 
T. testa subrotundd, planiusculd, subfuscd, longitudinaliter radiatim 
transversim substriatd, medio superné depressd, infra convead, sub- 
glabra; margine utrinque crenulato, medio glabro; long. 1+%; ; 
lat. #1, paulo plus; alt. 1} poll. 
Habitat in freto Magellanico, Mus. nost., Geo. Sowerby. 
20. CHITON SETIGER. 
C. testd ovali, anticé subattenuatd; valvis subdentatis, tenuiter con- 
centricé striatis, anticd 10-radiatd, posticd levi, parvuld ; areis 
lateralibus striis duabus elevatis marginalibus ; ligamento mar- 
ginali levigato, setigero; long. 23; lat. 13; poll. 
Habitat ad oras insule 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 striz, 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. Curiton BoweEnit. 
C. testd oblongo-ovatd, castaneo-rufd; dorso elevato; valvis subden- 
tats, sublevibus concentricé tenuiter striatis ; areis lateralibus 
radiatim sulcatis ; ligamento marginali granuloso, nigro; log. 
32; lat. 14; poll. 
