60 



EOCENE AND LOWER OLIGOCENE CORAL FAUNAS. 



cycles) are distiuft subacute ribs. The ribs are so undulated by the Hues 

 of growth that they have the appearance of a row of pustules when viewed 

 from the side. Angles at the end of the longer transverse axis oi' the calice 

 sharp. Septa slightly exsert, usually in four cycles, those of the first tw^o 

 cycles fusing by their inner margins to form the columella. Sometimes as 

 many as 18 septa may reach the columella. The number is usually less. 

 I have not seen any specimen with five complete cycles. Their free inner 

 portions are thrown into undulations, along the crests of which are granu- 

 lations arranged in checkered rows. The columella is solid or shows but 

 few vesicles. 



a PI. Ill, fig. 9, 9a. iPl. Ill, fig. 8. 



Localities. — Pittman's mill, Claiborne Parish, Louisiana; western Jackson 

 Parish and 10 miles northwest of Winnfield, Louisiana; St. Maurice and SE. 

 i of SE. ^ sec. 19, T. 1!) N., R. 7 W.. Louisiana; Gonzales, Texas; Newton, 

 Mississippi. 



Geologic occurence. — Lowcr Claibome. 



Types. — In the collection of the Louisiana geological survey; also, 

 United States National ]\Iuseum. 



Specimens — lu tlic collectioiis of tlic United States National I\Iuseum and 

 of T. IL Aldrich. 



Named for Dr. Otto Lerch, former State geologist of Louisiana. 



The species can be easily recognized (1) by its entire lack of any 



lateral wing above the pedicel; (2) by the fewness of its principal septa; 



(3) by the distinct, rather prominent costa*; and (4) b}' its glossy porcel- 



lanous epitheca. 



Flabellum cuneiforme Lonsdale. 



PI. Ill, fig. 12 and fig. 10; fig. 10 drawn from cast of one of Lonsdale's original speci- 

 mens; var. pachypbyllum, PI. Ill, figs. 11, 13-18; var. acutiforme, PI. Ill, figs. 19, 

 20; var. fragile, PI. Ill, fig. 21; var. wailesi, PI. Ill, figs. 22 to 23a, and PI. IV, 

 fig. 1 to 3a; var. magiiocostatnm, PI. IV, tigs. 4 and 4a. 

 AnthophyUum cuneiforme Conrad. MSS. (teste Lonsilale). 



