30 VERRILL, SYNOPSIS OF 



DENDROPHYLLIA CECILLIANA Edw. and Haime. 

 Loo Choo Islands. Dr. Wrn. Stirapson. 



PACHYSAMMIA, nov. gen. 



Coralluui massive and incrusting, consisting of several 

 corallites united together near their summits by a massive 

 eoenenchyma, budding lateral, irregular, surface of the coen- 

 enchyma with waving ribs as in Dendrophyllia. Four com- 

 plete cycles of septa. Columella not salient, rudimentary 

 or trabicular. 



This genus approaches Stereopsammia but has a solid coen- 

 enchyma. It differs from Dendrophyllia in not having a 

 distinct columella. 



PACHYSAMMIA VALIDA Verrill, nov. sp. 



Corallum broadly adherent at base, consisting of several 

 corallites united together at their bases by the thickened 

 coenenchyma, their summits free to a considerable extent. 

 The surface is strongly ribbed by coarse, granulous, waving 

 costae united together frequently by trabiculse, leaving irreg- 

 ular spaces between. Cells large, deep, oblong-oval with 

 thin porous walls. Oolumella little developed, loose trabic- 

 ular ; septa in five cycles, those of the two first subequal, 

 rather broad, thick, the edges entire, and sides strongly gran- 

 ulated, not exsert ; those of the third and fourth much narrow- 

 er ; those of the fifth more developed than the fourth, uni- 

 ted together in pairs and to the inner edges of those of the 

 preceding cycle before reaching the columella, with which 

 their inner edges are confounded. 



Height of the only specimen .75 ; greatest diameter of 

 cell .48 j width .3. 



Hong Kong, China. Dr. Wm. Stimpson. 



CCENOPSAMMIA MANNi Verrill, nov. sp. 



Corallum encrusting rocks, forming clusters of crowded 

 cups, about an inch high, some of the corallites are laterally 

 united even to the top, others are separated about an eighth 



