DESCRIPTIONS OP SPECIES. 121 



OCULINA ALABAMENSIS Sp. nOV. 



PL XII, figs. 4 to 7. 



In the collections of T. H. Aldrich and of the United States National 

 Museum are seven pieces of branches of a new Oculina, from Greg'gs 

 Landing, Alabama. Tlie branches are small, the longest between 20 

 and 25 mm. in length, and are very irregular in shape. The greater 

 diameter of the thickest piece is 9 mm.; one of the smaller pieces has a 

 diameter of about 4.5 mm. The coralhtes usually project somewhat above 

 the coenenchymal surface, but are not greatly elevated; about 1.5 mm. is 

 the maximum height of the projecting portion. On the outside of the free 

 part of each corallite are distinct costae corresponding to all septa. The 

 costge of the last cycle may be decidedly less prominent than those of the first 

 and second cycles, which are nearly (if not precisely) equal. In profile 

 they are usually flattish, and are densely granulate. The coenenchymal 

 surface very often shows no costse or strii3e, but is densely granulate; other 

 specimens, especially worn ones (see PI. XII, fig. 7), show distinct costse. 

 The calices are moderately deep, show no definite arrangement. The 

 distance between them is from 0.5 to 2 mm.; their diameters range 

 from 1.5 to 2.5 mm.; a very little more than 2 mm. may be considered the 

 average. The septa are in three complete cycles. The margins of those of 

 the first and second cycles are somewhat exsert. The first and second cycles 

 reach the columella, and have on the inner edges, just before reaching the 

 columella, small, thin, weak pali. Their sides are minutely and densely 

 granulated. Columella spongy, not greatly developed. 

 ■ Locality. — Grcggs Landing, Alabama. 



Geologic occurrence. — Grcggs Landing substagc of the Chickasawan. 



Types. — From collection of T. H. Ahbich in the United States National 

 Museum; and United States National Museum. 



This species is easily recognized by the small size of its calices and its 

 fragile character. 



