PLATE V. 

 Platytroohus, Discotkochus, Sphenotrochus. 



Page. 



Figs. 1 and la. I'latiitrochiia stolrsi (Lea) 74 



Copies of figures published by Milne-Edwards and Haime. 



Figs. 2 to 7. I'latytroch lis (/oldfussi (Lea) 76 



Figs. 2 to 5, upright views of four specimens, all x 3; fig. 2a, calicular view of 

 specimen represented by fig. 2; fig. 6, copy of fig. published by Milue-Ed wards 

 and Haime; fig. 7, similar view of a specimeu, x 5. The specimens represented 

 by figs. 2 aud 7 may be regarded as typical. 



Fid. 8. Cross section of septa and wall of I'latytroclius stokesi (Lea), x about 27 74 



Flos. 9 to 12. PlatytrocliHS claihornensis de Gregorio . 77 



Figs. 9 and 9a, copies of de Gregorio's original figures. Figs. 10 and 10a, X 4^; fig. 

 H, X 3 ; fig. 12, X 5. 



Figs. 13 to 19b. Discotrochus orbif/nianus Milne-Edwards and Haime 79 



Figs. 13 and 13a, copies of the original figures of Milne-Edwards and Haime. The 

 septal arrangement in fig. 13 is not correct. Figs. 14 to 16a, two views each of 

 three young specimens, i. e., an upper view and a side or profile view, x 2i; 

 fig. 17, outline of an adult specimen as seen from above, X about 3| ; fig. 18, a 

 few septa of the same specimen, as seen from above, somewhat more carefully 

 drawn; fig. 19, longitudinal section of a corallnm, X about 'i; fig. 19a, septal face 

 and columella of the same specimen more enlarged; fig. 19b, portion of the .septal 

 margin drawn in outline, much enlarged, to show the crenate character. 



Figs. 20 to 24. Spheiwti-ochus nanus (Lea) 80 



Figs. 20 and 20a drawn from Lea's type in the Philadelphia Academy of Natural 

 Sciences; fig. 20, x 5; fig. 20a, x 10; fig. 21, x 3; fig. 21a, calicular view of the 

 same, x between 5 and 6; fig. 22, a large specimen, X 3, which might be Sp. clai- 

 hornensis sp. nov. ; figs. 23 and 24, longitudinal sections of two coralla, x 10. 

 Figs. 7, 12, 17, 20, and 20a drawn by J. Henry Blake; all others by Dr. J. C. McConnell. 



218 



