PLATE V 1 1 T . 

 Tbochocyathus, Paracyathus. 



Page. 



Figs. 1 to 3. Trochoci/athiis siriatufi (Gabb) 101 



Fig. 1, general view of a specimen, natural size; tig. 2, costie magnitiod; fig. 3, cross 

 section of a coralluni, X 3|. 



Figs, i to 7. Trockocyalhita zitteli Merriam 102 



Figs. 4 and 4a, two views of the same specimen, natural size; fig. 5, costie of a speci- 

 men, enlarged: fig. 6 and 6a, two views of the same specimen, natural size; fig. 

 7, portion of a cross section of a coralhuu, x 3|. 



Figs. 8 to 10. Trochoci/atlius conoides (Gabb and Horn) 103 



Figs. 8 and Sa, two views of the same specimen, natural size; fig. 9. portion of 

 e.xternal surface, much enlarged; fig. 10, portion of a cross section of a coralhim, 

 X 3Jt. 



Figs. 11 to 14b. raracyuihuK allematns sp. nov 10,5 



Fig. 11, upright view of a corallum, X 3J; fig. 11a, longitudinal section of a coralhim 

 to show fiat surface of septa, pali, colunjella, etc., X 5; fig. 12, specimen with 

 prominent costa\ X 2 ; fig. 13, small, low form, X U ; fig. loa, eost;e of the preceding ; 

 fig. 14, large form with expanded base and rounded cost:e, X IS; fig. 14a, costa' of 

 the same, x 3^-: fig. 14b, calicnlar view of the same, X IJ. 



Figs. 15 to 15b. I'araojathus i/ranulonus sp. uov 107 



Fig. 15, general upright view, x 2; fig. 15a, cosfce of the same, enlarged about 4 

 times; fig. 15b, calicular view of the same, X about 3. 



Flos. Hi to 20. Paracyathna heUits sp. nov lOg 



Figs. 16 to 19, upright views of four specimens to show variation; fig. 16, height 12 

 mm.; fig. 17, height 8.75 mm.; fig. 18, height 5.5 mm.; fig. 19, height 3.5 mm.; 

 fig. 19a, costa; of the last specimen more enlarged; fig. 191i, calicular view of the 

 same specimen; fig. 20, longitudinal section of a coralhim to show ornamentation 

 of septal face, x 5. 



Figs. 21 to 21b. Paracyathus rugosua sp. nov 109 



Fig. 21, general upright view, natural size; fig. 21a, cost;e of the same specimen, 

 eularged; fig. 21b, calice of the same, enlarged about 5 times. 

 Figs. 11 anil 11a drawn by ,J. Henry Blake; all others by Dr. .1. C. JlcConnell. 



224 



