1898.] NATURAL SCIENCES OF PHILADELPHIA. 59 



Genus HETERODONAX Morch. 



(= Heterodonax Morch, 1853 ; + Arcopagia Orb., 1863, not 

 Brown ex Leach MS., 1827). 



1. Heterodonax bimaculata Lin. 



Florida to Brazil on the Atlantic ; San Diego, California, to Pan- 

 ama, on the Pacific Coast. 



Genus ASAPHIS Modeer. 



(= Asaphis Modeer, 1793 ; + Capsa Lam., 1801, not Lam., 

 1799 ; + Capsula Schum., 1817, not Sby., 1857 ; + Psammocola 

 (pars) Blainv., 1825 ; -f Isarcha Gistel, 1848, fide Morch, 1852 ; 

 -f- Sanguinolaria Desh., 1835, not Lam., 1799; -f- Pliorhytis Con- 

 rad, 1863). 



Type Asaphis {Venus) defiorata Linn. Indo- Pacific. 



1. Asaphis coccinea Martyn, 1784. 



Charlotte Harbor, Florida, to Brazil. 



(Heteroglypta von Martens, 1880, will form a section of Asaphis, 

 characterized by divaricate sculpture. Type Psammobia contraria 

 Desh., Isle Bourbon). 



Genus TAGELUS Gray. 



(= Tagelus Grav, 1847 ; + Siliquaria Schum., 1817, not Lam., 

 1801 ; + Solecurtus Orb., 1853, not of Blainv., 1825 ; + Cultellus 

 sp., Conrad, 1845 ; -\- Mesopleura Conrad, 1867 ; -f Tagelus Fischer, 

 1887 ; + Psammosolen Hupe, 1848, not Bronn, 1831). 



Type T. (Solen) gibbus Spengler, 1794. 



Section Tagelus ss. 



1. Tagelus gibbus Spengler. 



Cape Cod to Brazil, and coast of West Africa. 



2. Tagelus violascens Carpenter. 



Gulf of California to Nicaragua. 



3. Tagelus californianus Conrad. 



San Pedro, California, to Lower California. 



4. Tagelus affinis C. B. Adams. 

 Sta. Barbara to Panama. 



Section Mesopleura Conrad. 



5. Tagelus divisus Spengler. 

 Cape Cod to Venezuela. 



6. Tagelus politus Carpenter. 



San Pedro to Panama. 



