GEOLOGY AND PALEONTOLOGY OP THE CANAL ZONE. 337 



marginal edge, the other corresponding to it a Uttle lower down the 

 calicular wall; a third is sometimes seen; and in places where there 

 is an unusual distance between the calices, and when the 'line' is 

 wanting, the papillae are numerous, distinct, and a little smaller. 

 The lino and the papillae form a very marked distinction. Between 

 some calices there are faint elevations. Septa whole, not exsert, but 

 little visible in perfect calices, but very distinct when the coral is 

 worn. Upper margin perfect and concave upward, the septa ap- 

 pearing festooned to the columella; they are delicate, very little 

 thicker at the wall than elsewhere, and join the columella high up 

 near its point. The papillae at the calicular edge extend a little on 

 the wall, and may be considered as rudimentary septa and costae; 

 if so, there is a second cycle, and also a third in half of each system. 

 The persistence of six septa, nearly all of the same size, is very re- 

 markable. Columella styliform, large and dense in the corallite, and 

 forming a rounded-off cylinder with a sharpish rounded tip, which is 

 very distinct halfway down the cahce. CaUcular fossa shallow, 

 about half as deep as broad. Endothecal dissepiments stout, trans- 

 verse, numerous. The walls and columella do not fill up the lower 

 parts of the corallites. Increase by extracahcular gemmation. 



"From the Nivaje shale. Coll. Geol. Soc." 



Duncan reports the species from the Nivaje and Cerro Gordo 

 shales, Santo Domingo. 



I have 'received 22 specimens labeled StylopJiora ajfinis from the 

 Museum of Comparative Zoology, and 6 from the Philadelphia 

 Academy of Sciences. I have separated four of the specimens be- 

 longing to the form^er institution and have described them as a new 

 species. Six specimens are S.' ajjinis, 9 are worn but probably are 

 S. afiinis, 2 seem to be different and possibly belong to a difterent 

 species, 1 I refer to Duncan's S. granulata. I think that two of 

 Philadelphia Academy are referable to S. ajfinis, the four others are 

 probably worn specimens of the same species. 



In the specimens that I have referred to S. ajfinis the upper margin 

 of the calice is more prominent than the lower forming a smaU, pro- 

 jecting lip. Duncan's description in other respects is satisfactory. 

 As the surface of specimens is easily worn by rolling, the upper lip 

 of the calice and the surface ornamentation being destroyed, the 

 positive identification of many specimens is rendered impossible. 

 On the tips of the branches, which are blunt and rounded, the calices 

 are crowded, with no development of intervening coenenchyma. 



IVIiss Maury obtained in Santo Domingo a single specimen, a piece 

 of a small branch, of this species, on Rio Gurabo, zone D, associated 

 with Madracis decadis (Lyman), Pocillopora crassoramosa Duncan, 

 StepJianocoenia intersepta (Esper), OrhiceUa limbaia (Duncan), 

 Orbicella cavernosa var. cylindrica (Duncan), and SyzygopJiyllia 

 dentata (Duncan), 



