142 



SYDNEY J. HICKSON, M.A., D.SC, F.R.S., F.Z.S. 



Anatomy of the Soft Parts. — I have examined the anatomy of the 

 soft parts of a large number of specimens preserved in alcohol by- 

 mounting them whole and by making series of vertical sections. The 

 following is a list of the specimens examined : — 



Form of groiL 



th. 





Donor. 





Locality. 



Digitate & palmate. 





Prof Haddon. 





Torres Strait. 



" Alcicornis." 







Mr. Shipley. 





Bermuda. 



" Alcicornis." 







Mr. Lister. 





Tonga. 



" Alcicornis," 







Prof. Agassiz. 





Bahamas. 



"Alcicornis." 







British Museum. 





W. Indies. 



Ramose. 







Mr. Gardiner. 





Funafuti. 



Plicate. 







jj 





11 



Foliate. 







j) 





i 



Striate. 







11 





Rotuma. 



Ramose. 







Dr. Willey. 





New Britain Group 



Plicate. 







11 





5' 



(Several small fragments) 



11 





11 



Complanate. 







Mr. Duerden. 





Jamaica. 



"Exaesa." 







Dr. von Marenzeller. 



Red Sea. 



" Dichotoma." 







11 





>) 



And a specimen 



of" 



Plicate " form obtained 



by 



myself in Celebes. 



The preparation and examination of these Millepores has extended 

 over a period of twelve years, with the result that I have failed to 

 find any constant difference between them that can be used for the 

 separation of the genus into species. 



The structure of the gastrozooids and the dactylozooids is essentially 

 the same in all the specimens examined, but the size varies some- 

 what, according to the position from which the preparations are made 

 — those at the growing-edges being smaller than those at the base, &c. 

 The canal-system is the same in all specimens. /Zooxanthellse of 

 exactly the same size are always present in the superficial canals. I 

 have observed the two different kinds of nematocysts, the large and 

 small figured by Moseley, in all my preparations. Many of the Mille- 

 pores are known to sting badly, and have received popular names in 

 various languages expressive of this feature, but Mr. Gardiner informs 

 me that one form in Funafuti did not sting;. " It was at its base 



