296 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Straits, Maldive Islands (J. S. Gardiner), and Ceylon 

 (Herdman). 



B. caribbceum is only known from the American side of 

 the Atlantic Ocean. It is a siib-tropical form and has the 

 widest range of latitude of all species (see Table I.), 

 extending from 40 deg. N. to 40 deg. S. of the Equator. 

 It has been recorded from St. Thomas' Islands ; Kingston, 

 Jamaica; Gulf of Mexico; Birdshoal, North Carolina; 

 Itio de Janeiro ; mouth of the Plate River ; Bay of 

 Botafago, and Port Tampa. 



B. nakagawce is known only from Japan. If, as I 

 have endeavoured to show, these four species are really 

 one or at most only varieties of one single species, then 

 the distribution of B. lanceolatum becomes world-wide, 

 and it is an example of a truly cosmopolitan form. 



B. calif orniense has only been recorded from San Diego 

 Bay, California. 



B. elongatum has only been once taken, and that as far 

 back as 1852, from the coast of Peru. 



B. capense is known only from the South and Eastern 

 waters of South Africa. 



B. pelayicwin till quite recently was only known from 

 the Sandwich Islands where a single specimen was 

 captured by the " Challenger." From Mr. F. Cooper's 

 paper on Cephalochorda of the Maldives, we learn that 

 Mr. J. Lister, as far back as 1888, caught a specimen of 

 liranchiostoma in the South Indian Ocean, which has been 

 identified as B. pelagicum by Mr. Cooper. Later, 

 Professor Ilerdman's expedition demonstrated the 

 existence of this species in the Indian Ocean near Ceylon 

 and the Maldive Islands. 



B. indicum is quite locally distributed, being found only 

 in the Bay of Bengal, near the Orissa Coast, and at 

 Ceylon (Herdman). 



