Class I. LEPTOCARDII. Lancelets 



Order A. CIRROSTOMI. Cirrostomes 



Family 1. BRANCHIOSTOMID-ffi. Lancelets 



Genus 1. BRANCHIOSTOMA Costa. 



Branchiostoma Costa, Cenni Zoologici Napol., 49, 1834 {B. hibricum 



Costa, = la nceolat us Pallas). 

 Amphioxus Yarrell, Hist. Brit. Fishes, 1836, 468 {Limaxlanceolatus Pallas). 

 Amphioxides ^ Gill, Amer. Nat., XXIX, 1895, 458 (Branchiostoma pel- 



agicum Giintherj. 



1. Branchiostoma virginiae ^ Hiibbs. Virginia lancelet. 



Shallow waters, burying itself in the sand, from Chesapeake Ba^' to 



Florida; Beaufort, Capo Lookout, etc. 

 Branchiostoma virginix Hubbs, Occ. Papers Mas. Zool. Univ. Mich., 



No. 105, 8, July 6, 1922, Sewall's Point, Va. 



2. Branchiostoma floridae Hubbs. Florida lancelet. 



Coasts of Florida; Tampa, Pensacola, Cape Romans, St. Martin's Reef, 



Snapi)er Banks, etc. 

 Branchiostoma floridx Hubbs, Occ. Papers Mus. Zool. Univ. Mich., No. 



105, 7, July 6, 1922, Tampa Bay, Fla. 



3. Branchiostoma bermudae Hubbs. Bermuda lancelet. 



Bermuda Islands. 



Branchiostoma bermudx Hubbs, Occ. Papers Mus. Zool. Univ. Mich., 

 No. 105, 9, July 6, 1922, Bermuda. 



4. Branchiostoma caribaeum * Sunrlevall. West Indian lancelet. 



West Indies. 



Branchiostoma caribseum Sundevall, Vet. Akad. Forhandl., XI, 1853, 12, 

 St. Thomas. 



5. Branchiostoma californiense Gill. California lancelet; California am- 



phioxus. 



Pacific coast of America from San Diego Bay southward to San Luis 

 Gonzales Bay, Gulf of California; reported also from Panama. Abun- 

 dant in shallow water, buriefl in the sand. 



Branchiostoma californiense Gill, in Andrews, Studies Biol. Lab. Johns 

 Hopkins Univ., V, 1893, 235, San Diego. 



Family 2. EPIGONICHTHYIDiE 



Genus 2. ASYMMETRON Andrews. 



Asymmetron Andrews, Studies Biol. Lab. Johns Hopkins Univ., V, 1893, 

 237 {A. lucayanum Andrews). 



6. Asymmetron lucayanum .\ndrews. Bahama lancelet; Bahama amphioxus. 



West Indies; Bemini and Na.s.sau, Bahamas; Culebra Island; Humacao, 



Porto Rico; south to Brazil. Common. 

 Asymmetron lucayanum Andrews, Studies Biol. Lab. Johns Hopkins 



Univ., V, 1893, 237, Bemini, Bahamas. 



' Based on larvae showing no buccal cirri, found in the open sea near Hawaii. 



' I'ntii the recent studies of Hubbs, this species was wrongly identified with the European form (B. 

 lanceolatum), which, however, does not occur in America. 

 * Represented on the coast of Brazil (Kio Janeiro, etc.) by B. platx Hubbs. 



