218 



J. H. ASHWORTH. 



Measurements of the Autozooids of Heteroxenia Elizabeths. 



Reference 

 Number. 



Total 



Length of 



Polyp. 



Width 



of 

 Polyp. 



Length of 

 Tentacles. 



Number of 



Pinnules on each 



side of Tentacle 



(outer aspect). 







mm. 



mm. 



mm. 







Al 



•64 



•3 



•24— ••'! 



0-1 



PI. XXII., Fig. 38. 



A2 





1-4 



"5 



•4 



Trilobed = l 



— 



A3 





2-0 



■7 



•9 



3-4 



A 3, Fig. 37. 



A4 





2-8 



•9 



10 



5 



— 



A5 





4 4 



•7 



1-3 



7 



A 5, Fig. 37. 



A6 





5-8 



1-1 



1-7 



8 



— 



A7 





6-0 



1-1 



2"2 



12—13 



— 



A8 





9-1 



2-0 



3 1 



15 



— 



A9 





12-8 



1-2 



3-5 



15—16 



— 



A 10 





14-0 



24 



4 3 



16 



— 



All 





20-2 



2-0 



5-0 



18 



— 



A 12 





28 4 



2 4 



5 2 



24—25 



— 



External Characters of the Sipho?wzooids of Heteroxenia Elizabethan. •— 

 The siphonozooids, like the autozooids, are non-retractile. These vary 

 in length from 1*8 mm. to 5 - mm., and are "5 mm. to 10 mm. wide. 

 Their tentacles are all in the same condition, and are mere lobes from 

 '2 mm. to - 25 mm. in length, and never show any traces of the forma- 

 tion of pinnules. It will be seen from the appended table that there 

 is no development of the tentacles corresponding to the increase in 

 length of the individuals, so that the tentacles of a zooid 5 mm. in 

 length are very similar to those of a specimen less than half its size 

 (compare S 1 and S 7 in table). 



Table of Measurements of the Siphonozooids of Heteroxenia 



Elizabeths. 



Reference 



Total length 



Width of 



Length of 





Number. 



of Zooid. 



Zooid. 



Tentacles. 

 mm. 







mm. 



mm. 





S 1 - 



1-8 



•7 



•2 



— 



S2 - 



2 



•8 



•2 



— 



S3 - 



2 3 



•8 



•23 



— 



S4 - 



3-0 



•8 



•24 



— 



S5 - 



4-5 



1-0 



•2 



— 



S6 - 



4-8 



6 



•25 



— 



S7 - - - 



5-0 



•8 



2 



Figs. 37, 39. 



S8 - 



5-0 



•9 



•25 



— 



