MADEEPOEAEIA OF THE DEEP SEA. 241 



the closest resemblance was noticed between it and those described and figured as Para- 

 cyathus striatus, Philippi. A specimen of this species is in the collection of corals now 

 under consideration ; and as it is in a good state of preservation, it is delineated with 

 \he Paracyathus from 50-100 fathoms dredged by the Gulf-Stream Exploration Survey. 



The American form has four perfect cycles and none of the orders of the fifth cycle ; it 

 has 24 single-lobed tall pali, of which the tertiaries are the largest ; the columella is 

 deeply situated, and its papillse are distinct and much smaller than the pali. The 

 columella is oval and moderately large; and the costae are subequal, rather flat, varnished- 

 looking, and minutely cross-grauied. (Plate XLIV. figs. 4-7.) 



The Mediterranean forms are like the American, with the exception of the costal 

 structures, which in the first are more prominent, less glazed, but still granular. There 

 are four cycles of septa. (Plate XLIV. figs. 8-10.) 



I propose, then, to include the coral so kindly given me by Count Pourtales with the 

 Mediterranean Paracyathus striatus, Philippi, sp. 



Paeactathus monilis, sp. nov. (Plate XLIV. figs. 11-13.) 



The corallum has a broad base and open calice, which is not very shallow. The costae 

 are visible to the base in series of raised lines, with a row of large sharp granules. 

 The columella is formed by a twist of ribbon-shaped sclerenchyma, and is small. 

 The septa are not crowded, are distinct, and the primaries are the largest and the most 

 exsert. They extend far into the fossa ; there are four incomplete cycles, and all the 

 laminae are granular. The smaller septa are rather wavy, and correspond to costae 

 larger than themselves, which do not reach far down. The pali are long, narrow, not 

 prominent, and are placed before the tertiaries and some secondaries where the cyclical 

 arrangement is incomplete. In young specimens with 24 septa the pali are placed before 

 the primaries. 



Height T^ inch ; breadth of calice -^ inch. 



Locality, 60 fathoms, seven miles ofl' Rinaldo's Chair, Mediterranean. 



Pakactathus inoenatus, sp. nov. (Plate XLIV. figs. 14-16.) 



The corallum is short, and the base is almost as wide as the calice. The costae are 

 absent, and are replaced by a plain glistening pellicular epitheca, marked with in- 

 distinct shagreen-looking granulations. The septa are not exsert, are numerous, 

 slender, wavy, not crowded, and very unequal. Those of the last cycle are simple pro- 

 jections from the wall. The tertiaries project more inwards, and have a small palus 

 before them as thin as they are. The secondaries are not to be distinguished from the 

 primaries, are granular, and have a papilliform palus. 



The columella is very small and trabecular. 



Height ^0 inch ; breadth xo inch. 



Locality, Mediterranean Sea. 



