CATALOGUE SHELLS. 



549 



described has a rounded form; the bows or front being rather 

 elegantly and finely lamellated in a wavy form ; the colour of the 

 hinge is red^ and the inside is generally of a brownish purple ; in 

 some it has a more yellow tinge. 



13. Arca pectinoides. 



A, testd auriculatd, cordatd, ventricosd, multi'costatd, transversim 

 striatd, alhd, epidermide rufo nigricajite, pilosd; umhonibus sub' 

 approximaiis, incurvatis, margine crenulato ; long. 1 ; lat. If ; 

 poll. 



Habitat ad Rio de Janeiro. Mus. Brit., nost., Brod. 



14. NUCULA STRIATA. 



N, testd striatd, subtumidd, crassd, sub-trigond, albd; latere antico 



production, sub-rostrato ; long. -^-^ ; lat. § ; poll. 



Habitat in rnari alto circa or as Patagonicas. Mus. nost. 



Taken by a dredge in 40 fathoms water, 20 miles from the coast 

 of South America, in the neighbourhood of Port Sta Elena. 



15. MODIOLA SINUOSA. 



M. testd ventricosd, subovatdy longitudinaliter striatd; intus irides- 

 cente, margine sinuoso, epidermide fused ; long. -^^ ; lat. \%fire; 

 poll. 



Habitat ad littora BrasilicB (Santos). Miis. nost. 



16. Pecten Patachonicus. 



P. testd siib-cequivalvi, brunned, longitudinaliter creberrime elevalO' 

 radiatd; intus albiddy longitudinaliter sub-radiatd ; long. 2|; 

 lat,2^; poll. 



Obs. auribus incBqualibus. 



Habitat in freto Magellanico passim. Mus, nost. 



17. Pecten vitreus. 

 P. testd subcequivalvi, translucente, longitudinaliter multi-sulcatd ; 

 sulcis convexis jlavidulis, valvd inferiore pallidiori ; long. 1^^^ ; 

 lat. 1^; poll. 



Obs. Auribus incequalibus. 



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 brach/ptera and M. Fatachonica). 



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