DESCRIPTION OF SPECIES. 221 



The material on which this study is based is preserved in 

 the collections of Walker Museum of the University of Chicago. 

 The writer wishes to acknowledge the helpful criticisms and sug- 

 gestions of Professor Weller under whose constant supervision 

 this paper has 'been prepared, and especially to acknowledge her 

 indebtedness to him for the assistance given in the photo- 

 graphing of the specimens. 



DESCRIPTIONS 



COELENTERATA 



Class ANTHOZOA 



Subclass Tetracoralla 



Family Zaphrentidae 



Genus Zaphrentis Rafinesque 



Zaphrentis cornuformis sp. nov. 



Plate 57, figures 3-7. 



Description — Corallite of medium size, simple, turbinate, commonly a little curved, 

 rarely straight, the greatest curvature occurring near the apex; sides tapering gradu- 

 ally and uniformily, apex acute. The dimensions of the type specimen which is 

 an average sized individual are: Length 85 mm., diameter of upper part of cup approxi- 

 mately 40 mm. Irregular wrinkled lines of growth give the shell an annulated appear- 

 ance. Septa strongly marked on the exterior of the coral, about 85 in number where the 

 diameter of the coral is 35. mm. A cross-section of the lower part of the cup shows the 

 septa to be of equal length, almost reaching to the centre and not coalescing. A well- 

 developed fossula occurs. Tabulae not observed, probably not well developed, or if 

 present they have been poorly preserved. Character of cup obscure. 



Remarks — This species may be distinguished easily from the other simple corals 

 in the fauna, and likewise it is the most abundant. It differs from Zaphrentis salinensis 

 in its more slender and tapering outline, in the distinct curvature of the sides, and it 

 presents a less massive appearance. The septa are generally smaller. 



Horizon — Lower beds. 



Holotype and Paratypes No. 27552 Walker Museum. 



Zaphrentis salinensis sp. nov. 

 Plate 57, figures 1, 2. 



Description — Corallite simple, large, conical, sides straight, expanding gradually 

 and uniformily. The dimensions of the type specimen are: Length about 80 mm., 

 diameter of calyx approximately 55 mm. Tabulae not observed, possibly not strongly 

 developed. Encircling lamellae are present on the part of the coral preserved. Septa 

 about 90 where diameter of calyx is 45 mm. Length of septa, character of upper part 

 of cup, and fossula not observed. 



Remarks — One large incomplete example, and a smaller one, which appear to belong 

 to this species, have come under observation. 



Horizon — Lower beds. 



Holotype and Paratype No 27553 Walker Museum. 



