94 



of the male and female trophodiscs, and, consequently, it is 

 very desirable that as many examples as possible of the two 

 genera should be studied, with the object of discovering 

 whether such a general distinction does exist. I have com- 

 pared my sections of this species of Allopora with those I 

 made some years ago of Allopora from Norway, and can find 

 no essential points of difference between them. The only 

 Stylaster that I have had an opportunity of examining was 

 a Stylaster gracilis (female) from Torres Straits. This is a 

 very slender form, but it agrees in general features with 

 Allopora. 



The verdict, then, on the identity of Allopora and Stylaster 

 must be " not proven," but I would take this opportunity of 

 pointing out that it is male specimens of Stylaster well pre- 

 served in spirit that are wanted to settle this interesting point. 



This is the only specimen of the Hydrocoralline sent to me 

 from the Cape, and it may be identical with the specimen 

 obtained by the Gazelle which Studer considered to belong to 

 the species Allopora oculina of Ehrenberg. 



List of the Principal Works referred to in the Text, 



1. Lacaze Duthiers, H. Histoire naturelle du Corail. 



1864. 



2. Marion, A., et Kowalewsky. Documents pour I'histoire 



embryogenique des Alcyonaires. Ann. Musee 

 de Marseille. Vol. I. 1883. 



3. von Koch, G. Die Gorgoniden des Golfes von Neapel. 



4. Kolliker, A. Die PennatuHde Umbellula, etc. Fest- 



schrift Wiirzburg. 1874. 



5. Kolliker, A. Beitrage zur Kenntniss der Polypen, Phys. 



Med. Ges. Wiirzburg, II., ii. 



6. Kolliker, A. Icones Histiologicae. 



7. Kolliker, A. Anat-system Beschreib der Alcyon. 1872. 



8. Koren and Danielssen. Nye Alcyonides, etc. Bergen, 



1883. 



9. Klunzinger. Die Korallthiere des Roten Meeres. 1877. 



10. von Marenzeller. Ueber die Sarcophytum benannten 



Alcyoniden. Zool. Jahrb. I. 



11. May, W. Beitrage zur Systematik und Chorologie der 



Alcyonaceen, Jen. Zeits XXXIII. 26. 



