i68 



The preceding list gives a complete statement of all the specimens of Cyclostomata 

 which I have found among the 'Siboga' dredgings. It will be seen that members of this group 

 have been discovered in 40 Stations out of about 135 Stations at which Polyzoa were obtained; 

 or almost the same as the number (42) at which either Entoprocta or Ctenostomata, or both 

 these groups together, were found (cf. pp. 92 — 94). It exceeds the total for either group separately; 

 Entoprocta having been found at 30 Stations, and Ctenostomata at 29. Cyclostomata were 

 recorded in company with Entoprocta at 2 1 Stations ; and with Ctenostomata at 1 6 Stations. 

 Of these sixteen, none yielded less than 13 species of Polyzoa (mostly Cheilostomata); while 

 at each of the other ten Stations more than 30 species of Polyzoa were discovered. 



These facts are further elucidated by the following table ; in which are set out all the 

 Stations at which Cyclostomata were found in company with Entoprocta or with Ctenostomata, 



Stations at which Cyclostomata were found with Entoprocta and Ctenostomata. 



STATION. 



DEPTH , 



IN METRES. 



ENTOPROCTA. 



CTENOSTOMATA. CYCLOSTOMATA. 



Species of POLYZOA 

 in geneval (including 

 CHEILOSTOMATA). 



4 

 6 



3 

 2 



1 

 2 

 2 



9 

 1 



3 

 2 



1 



6 

 2 



1 



3 



1 

 1 



4 

 5 

 2 



9 



1 

 2 

 1 



6 

 3 

 5 

 1 



3 



7 

 1 

 2 



3 

 1 



4 



1 



7 

 1 



15 



42 

 14 

 37 

 65 

 31 

 52 



3i 

 6 



17 



17 



54 



O -> 



"J 



87 

 13 

 44 

 33 

 15 

 24 



65 

 40 

 26 

 18 



55 

 12 



The last column in the above table indicates the total number of species of Polyzoa found at the 

 respective Stations; and it therefore includes the numbers given in the preceding three columns, in addition 

 to that of the Cheilostomata, which are throughout more numerous than the other three groups together. 

 As the revision of the Cheilostomata has not yet been completed, the numbers in the last column are 

 probably not quite accurate. 



168 



