REPORT ON THE CRINOIDEA. 



371 



I.-V. 



I.-VII. 



II. -IV. 



II.-V. 



II.-VII. 



III.-IV. 



III.-V. 



III.-VII. 



IV. -V. 



V.-VI. 



VI.-VII 



VII.-VIII. 



VII. -IX. 



XL 



c. 



III. 



IV. 



V. 



VI. 



VII. 



VIII. 



IX. 



X. 



XL 



3 of these 5 descend to 350 fathoms. 



1 of which descends to 632 fathoms. 



4 species descend from 20 to 200 fathoms. 



2 of these descend to 220 fathoms. 



1 of which descends to 743 fathoms. 



9 species descend from 50 to 200 fathoms. 



5 of these descend to 350 fathoms. 



2 of which descend to 800 fathoms. 



1 species descends from 124 to 262 fathoms. 



1 

 1 

 2 

 1 

 1 



291 to 422 

 420 to 550 

 550 to 1100 

 630 to 1350 

 2600 to 2900 



I. 86 species only found at depths down to 20 fathoms. 

 II. 4 species only found at depths of 20 to 50 fathoms. 



2 



17 



5 



15 



11 



2 



1 



5 



1 



50 to 100 



100 to 200 



200 to 350 



350 to 500 



500 to 800 



800 to 1100 



1100 to 1500 



1500 to 1800 



2600 to 2900 



An analysis of Summaries B and C shows tbat of twenty-eight Comatula-species 

 which occur in the abyssal zone, twenty-two are peculiar to it. Seventeen of these 

 twenty-two belong to the genus Antedon, seven of them to the Tenelhi-group, and the 

 remainder to the Basicurva-, Spinifera-, and Granulif era-groups, all of which have 

 flattened rays and plated ambulacra. Furthermore, the only continental species of 

 Antedmi which extends downwards into the abyssal zone also has plated ambulacra ; 

 while two of the three littoral species found in the abyssal zone belong to the Tenella- 

 group, the third being Antedon eschrichti, which is so widely distributed in the 

 northern circumpolar region. 



