Cirrhipeda, Conchifera, and Mollusca. 337 
approximatis, incurvatis, margine crenulato; long. 1; lat. 12; 
poll. 
Habitat ad Rio de Janeiro. Mus. Brit., nost., Brod. 
14, NucunA STRIATA. 
N. testéd striaté, subtumidd, crassd, sub-trigond, albd; latere antico 
productiori, sub-rostrato ; long. 3; lat. 2; poll. 
Habitat in mari alto circa oras Patagonicas. Mus. nost. 
Taken by a dredge in 40 fathoms water, 20 miles from the coast of 
South America, in the neighbourhood of Port St. Elena. 
15. MopioLa sinvosa. 
M., testé ventricosd. subovatd, longitudinaliter striaté; intus irides- 
cente, margine sinuoso, epidermide fuscd ; long. 7; ; lat. +4 fere; 
poll. 
Habitat ad littora Brasilie (Santos.) Mus. nost. 
16. PrEcTEN PATAGONICUS. 
P. testé sub-equivalvi, brunned, longitudinaliter creberrimé elevato- 
radiaté ; intus albidd, longitudinaliter sub-radiatd ; long. 24; 
lat. 24 ; poll. 
Oss. auribus ineequalibus. 
Habitat in freto Magellanico passim. Mus. nost. 
17. PECTEN VITREUS. 
P. testé subequivalvi, translucente, longitudinaliter multi-sulcatd ; 
sulcis convexis flavidulis, valud inferiore pallidiori ; long. 1,9;; lat. 
14; poll. 
Oss. Auribus inequalibus. 
Habitat in freto Magellanico (passim.) Mus. nost. 
This shell is found attached to the leaves of the Fucus giganteus, and, 
with other Mollusca, is the food of the Steamer or Race-horse Duck 
(Micropterus brachyptera and M. Patagonica.) 
18. TEREBRATULA FLEXUOSA. 
T. testa rotundato-cordatd, gibbd, sub-fuscd, longitudinaliter creberrimé 
