CLASSIFICATION OF THE CEPHALOCHORDA. 



295 



Table II. — Showing Distribution in the Great Waters 

 of the World. 













T3 







c3 









fl (H S^ 



r*H O 



=i 9, 



._ a . 



£ 43 ^ 



|3 'r^ CD 



r3 



*-J 



CD . 



20 ce 



■4-8 



Sj 



Species. 



India 

 Oceai 

 Prope 



o'o 



Vy 43 



1-1 



East 



India 



Seas 



2|^1 



O o 



03 O 



O c3 



5^ 



Ti CD 



^3 -ta 



43 



o 



B. lanceolatum 



+ 













+ 



+ 





+ 



B. belcher i 



+ 







+ 



+ 













B. caribbamm 















+ 





+ 



+ 



B. nakagawce 





+ 



















B. pelagicum 



+ 



+ 









+ ' 











B. clongatum 







+ 

















B. califomiense 





+ 



















B. capense 













+ 











B. indicum 



+ 





















A. bassanum 











+ 













A. hectori 











+ 













A. maldivense 



+ 





















A. cultellum 



+ 









+ 













A. lucayanum 



+ 



















+ 



A. caudatum 









+ 















A. cingalense 



+ 





















also in the Pacific), to the Indo-Pacific area, while the 

 genus Branchiostoma is equally well distributed in both 

 regions. It will be noticed from Table II. how 

 extremely localised the species of Asymmetron are, each 

 being found in one, or, at most, two places. 



B. lanceolatum is perhaps the most widely distributed 

 of all species. It is confined to the Northern Hemi- 

 sphere and though essentially temperate it is found in 

 tropical seas as well. It has been recorded from the 

 English Channel, North Sea, Coast of Norway, Firth of 

 Clyde, the Mediterranean, especially at Messina and 

 Naples, all along the Atlantic shores of North America 

 from Chesapeake Bay to Florida, and from Ceylon 

 (Herdman). With the single exception of Ceylon it is 

 confined to the Atlantic Ocean. 



B. belcheri is a purely tropical and Indo-Pacific form. 

 It has been recorded from Borneo, Singapore, Torres 



