186 ANNALS NEW YORK ACADEMY OF SCIENCES 



which he includes Siplionophyllia, and forms which have been confused 

 with it as follows : 



It differs from Zaphrentis [including Siphonophrentis as defined below, and 

 Hcterophrentis] by the following cbaracters : 



1. The fossnla of Zaphrcntls is limited at the center of the calyx by a regular 

 border, formed by the union toward the interior of the larger septa nearest the 

 cardinal septum, and the tabular depression of the fossula is always extremely 

 deep. 



2. Even in the adult, ZapJircutis does not have the external vesicular zone, 

 even in a reduced condition. 



3. In ZapJirentis. there is a stereoplasmic band adhering to the epitheca, 

 while in Cauinia. that stereoplasmic band detaches itself from the epitheca to 

 form an internal wall ; that wall is separated from the epitheca by the ex- 

 tei'nal vesicular zone.^^ 



The wall is not a true one as in the case of Eridophylluni and Craspe- 

 dophylhim, but only a pseudotheca. The author continues: 



Cauinia differs from Cpathophyllum in the following characters : 



1. The fossula in Cyathophyllum is simply indicated, if not absent ; radial 

 symmetry is altogether dominant. 



2. The vesicular dissepiments affect in Cyathophyllion a regularity which is 

 never attained in Caniiiia. ^ 



3. In Cyatltophiflhirii, there is not a very decided separation between the 

 external vesicular zone and the middle zone. The striking character which 

 gives to the middle zone the stereoplasmic thickening of the septa is lacking 

 in Caninia. 



4. In Cyathophyllinn the tabula? are very near together and are united by 

 many transverse lamelhp. so that they become an irregular mass of rather 

 large vesicles." 



13 "II differe de Zaphrentis par les earn c teres suivants (pi. ix. tig. 1, 2) : 



"1. La fossette des Zaphrentis est limitee au centre du polypier par iine bordure 

 r^guliere, formee par la reunion vers Tinterieur des septa majeurs les plus voisins du 

 septum cardinal, et la depression tabulaire de la fossette est toujours extremement pro- 

 fonde ; 



"2. meme a I'age adulte. les Zaiilurntis n'out pas de zone A'esiculaire externe, meme 

 reduit ; 



"3. Chez les Zaphrentis, il y a une bande stereoplasmique collee a I'epitheque tandis 

 que Chez Caninia, cette bande stereoplasmique se detache de I'epitheque pour former une 

 muraille interne ; cette muraille interne est separee de I'epitheque par la zone vesiculaire 

 externe." (24, 1?,.) 



^* "Caninia differe de Cyathophijllum par les caracteres suivants (pi. ix, fig. 3 et 4) : 



"1°. la fossette chez Cyathophyllum est simplement indiquee, si pas absente ; la 

 symmetric radiaire est tout k fait dominant ; 



"2°. les vesicules dissepimentales affectent chez Cyathophyllum une regularite qui 

 n'est jamais atteinte dans Caninia; 



"3°. chez Cyathophyllum, il n'y a pas de separation bien tranchee entre la zone 

 v6siculaire externe et la zone moyenne. La caractf^re frappant que donno a la zone 

 moyenne I'epaississment stereoplasmique des septa chez Caninia fait ici defaut ; 



"4°, chez Cyathophyllum les planchers sont tres rapproches et reunis par le multi- 

 ples traverses, de sorte qu'ils deviennent un amas irregulier de v6sicules assez large." 

 24, 15, IG.) 



