1 88 EOCENE AND LOWER OLIGOOENE CORAL FAUNAS. 



Endopachys MACLURii var. TENUE var. uov. 

 PI, XXII, tigs. 2 to 5. 



This variety is characterized by being much compressed, with a great 

 development of the marginal wings and a small development of the lateral 

 tubercles. The base may be straight, curved, or subtriangular. The 

 calicinal cavity is small compared to the size of the corallum, and there are 

 not five complete cycles, but four complete cycles with members of the 

 fifth present in the systems next the ends of the longer transverse axis. 



I do not see how this can be regarded as more tlian a variety, but it 

 usually has a quite distinct facies and is characteristic of one horizon. 



Locality of types. — Elm Crcek, Lce County, Texas; found in Louisiana and 

 Texas. 



Horizon. — Lower Claiborne. 



Types. — Wagner Free Institute of Science, Philadelphia. 



Endopachys maclurii var. triangulare Conrad. 



PI. XXII, tigs. 7 and 8, drawn from a specimen labeled by Conrad; and probably alsa 



"tig. 9. 



1855. Endcqjachys trianfiiihtre Conrad. Proc. Acad. Nat. Sci. Pliila., Vol. VII, p. '2C>. 

 1866. Endopaehyn triiuHiulure Conrad. Check List, p. 2. 



1890. Endopachys triangulare de Gregorio. Mou.delaFauneeo('euiquedel'Ala.,p.258. 

 1896. Endopachys maclurii var. trianyulare Vaughan. Bull. U. S. Geol. Survey No. 

 142, p. 57. 



This variety can be best characterized by a comparison with E. maclurii. 

 The outline of the corallum when seen from the side is that of an isosceles 

 triangle, with the apex truncated; the two tubercles on its face are not so 

 prominent as is usually the case in E. maclurii, and it has more distinct cos- 

 tse than the latter species. The septal arrangeinent is identical with that of 

 E. maclurii. Greater diameter of the corallum, 2G.5 mm.; greater diameter 

 of the fossa, 1 9 nmi. ; lesser diameter of the fossa, 14 mm. ; height of coralliuu, 

 16.5 mm. 



Localities. — Yicksbvirg and Jackson, Mississippi ; Montgomery, Louisiana. 



Geologic occurrence. — JacksouiaQ aud Vicksl)urgian stages. 



Type. — Collection of the Academy of Natural Sciences, Philadeljjhia. 



The large specimen represented by PI. XXII, fig. 9, comes from 

 Jackson, Mississippi, and is from the collection of Mr. T. H. Aldrich. 



