176 LITTORINID^ 



var. filosa. 

 Trochus filosus, Helbling, Privatg. Bohmen IV, 1779 (fide Mo'rch, 1876). 



Morch does not record the following important locality. 

 2 Florida ; coll. Prof. E. C. Stearns. 



5. Modulus unidens. 



Trochilus unidens, Listeri, Chemn., Conch. Cab. I, Vol. X, p. 290, 1788 ;= 

 Monodonta carchedonicus, Lam. 1822, Mab. ? ; fide Mo'rch ^=Trochus 

 perlatus, Dillwyn, also Wood (not of Gmelin), and var. minor= 

 Monodonta angulata, C. B. Adams, P. Host. S. 1845, Jamaica. 



7 Panama and Gulf of Fonseca; coll. Profs. E. C. Stearns and 

 W. Newcomb. 



6. Modulus disculus. 



Trochus disculus, PUlippi, Z&its. MalaTc.\1846, Mazatlan. 



var. [fide Newcomb]. 



20 Gulf of California; coll. Profs. E. C. Stearns and W. Newcomb. 



.7. Modulus obtusatus. 



Trocbus obtusalus, PUlippi, Conch. Cab. II, 1846, Lov. ?, for Chemnitz, 

 fly. 156970. 



7 Mauritius and Ceylonj coll. G. Nevill, Esq., 



Despite the highly valued opinion of von Martens, I consider 

 this a distinct species. 



1 Eodriguez ; coll. J. Caldwell, Esq. 

 A doubtful specimen ; in very bad condition. 



8. Modulus tectum. 



Trocbus tectum, Gmelin, Syst. Lin. 1788, West Indies ; from Madagascar, 

 Natal, Bed Sea, Bourbon, fide v. Martens ; fide Petit = Monodonttt 

 retusa, Bruguiere = Modulus cidaris, Reeve. 



7 Mauritius and Seychelles ; coll. G. Nevill, Esq. 



3 Natal ; coll. G. Nevill, Esq. 



3 Trincomalee (?) j ex c. Dr. F. Stoliczka. 



