96 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



The specimens from the coast of S. Paulo are of a uniform brown 

 colour, sometimes incurved, owing to deformity ; those from Rio de 

 Janeiro, Bahia, and Pernambuco have a bright green band. 



The species occurs from S. Paulo to Guiana, and also at Panama and 

 California. 



Subgcn. AMYGDALTJM. 



14. Modiolus picttjs, Lam. 



Mudiola pieta, Lamarck : Anim. sans Vert., vol. vi (1819), p. 112. 

 ,, arborescens, Chem. : Reeve, Conch. Icon., vol. x (1858), fig. 30. 

 ,, ,, Chem.: Clessin, Conch. - Cab., 2nd ed., p. 100 



(1887), pi. xxix, fig. 10. 

 ,, ,, Chem. : Jhering, Rev. Mus. Paulista, vol. ii 



(1897), p. 105. 



This is a West Indian species said by Morch to occur also on the 

 Brazilian coast; but if so, it will be to the north of Pernambuco. 



GEOGRAPHICAL DISTRIBUTION. 



Of other genera of Mytilidse on tlie coast of brazil and Argentina, 

 the following species occur: — Lithophaga nigra, Orb. (= L. ( arabcea, 

 and L. Antillarum, Phil.), is said by Dall to occur at Rio de Janeiro. 

 Lithophaga Antillarum, Orb., of which L. straminea, Reeve, seems to 

 be a synonym, and L. cristata, Dillwyn, have not been observed 

 hitherto southward of the West Indies. Lithophaga bisulcata, Orb., 

 occurs from South Carolina to St. Catharina, where, as Prof, von 

 Martens informs me, Fritz Midler collected examples sent to the 

 Berlin Museum. I obtained the species at S. Sebastiano, where 

 it bores into corals. L. Patagonica, I have from Puerto Madryn, 

 Patagonia ; Rochebrune & Mabille obtained it from the Magellan 

 Straits. Modiolaria opifex, Say, 1 have from Bahia; Dunker obtained it 

 from St. Catharina. Modiolaria viator, Orb., occurring from Patagonia 

 to the Antilles, I have from S. Sebastiano. Prom Cap S. Antonio, 

 Argentina, I have another Antillean species of wide distribution, 

 Crenella divaricata, Orb., which also occurs at Panama. 



The following is the complete list of the Mytilidse occurring between 

 the Magellan Straits and the AVest Indies, on the Atlantic shores of 

 South America, the species marked with an * occurring also in the 

 Antillean regions : — 



Mytilus cdulis, Linn. : Magellan Straits to Rio Grande do Sul and 

 St. Catharina ; Chili ; New Zealand ; Northern 

 Hemisphere. 



,, strigatm, Hanley : Argentina to Rio de Janeiro ; Philippines. 



,, Solisianus, Orb. : Uruguay to the "West Indies. 



,, perna, Linn. : St. Catharina to Rio de Janeiro. 



,, Magellanicus, Chem. : Magellan Straits to Rio Negro ; Chili ; 

 Xcw Zealand; Kerguelen; South Africa ; Fiji. 



