Beecher — Observations on the Genus Bomingeria. 7 



usually found, Plate Y, figures 4, 5. The corallites are a 

 little larger than in B. umhellifera from Leroj, New York, 

 and the length of the internodes is often much greater, some- 

 times measuring 30™''' or more. 



Formation and locality. — The type specimen is in the col- 

 lections of the Museum of Comparative Zoology, Catalogue 

 Number 8849, Kentucky Fossil Corals, Plate 76, figure 1, and 

 is from the Corniferous limestone (Devonian) at the Falls of 

 the Ohio, Louisville, Kentucky. 



Bomingeria Jacksoni, sp. nov. 

 Plate V, Figures 2, 10-15. 



Corallum consisting of slender, cylindrical, discrete corallites, 

 measuring from "7 to •8™'" in diameter. At intervals of from 

 5 to 10™™ a whorl of seven buds is given off from each coral- 

 lite. The buds are closely appressed to the parent for a dis- 

 tance of 1 or 2™™ and then turn outward often nearly at right 

 angles for 2 or 4™™, thence extending upward to the next 

 budding zone. The walls of the parent corallite are expanded 

 just before the buds appear, and abruptly contract within the 

 verticel to a little less than their normal diameter. On the 

 exterior the corallites are marked by fine concentric striae. 

 Tabulae infrequent, most common in the region of the umbels. 

 Septa or septal spines not observed. A large apical initial 

 pore connects each daughter corallite with the parent, and 

 adjacent corallites often show communicating pores, as in 

 B. uinbellifera. 



Occasionally the corallites become agglomerated into a mass 

 resembling a Favosites^ though around the periphery the 

 branches are discrete and give off the usual umbels of seven 

 buds each. A section of the closely grouped corallites is rep- 

 resented in figure 10, Plate Y, showing their prismatic form. 



Tliis very distinct and normal species of Bomingeria can 

 be readily recognized from B. umhellifera by the smaller 

 diameter of the corallites, the relative greater length of the 

 internodes, and especially by the number of buds in each verticel. 

 In B. umhellifera^ out of a hundred umbels only four contained 

 seven buds, while 85 per cent had from ten to twelve, with 

 twelve as the characteristic number. The present collections 

 contain eighteen umbels of B. Jacksoni^ and each one of these 

 is composed of seven buds besides the parent corallite. From 

 B. tniiior, this species is distinguished by its larger size and by 

 the number of buds in a single verticel, which in that form 

 number five. 



The specific name is given in honor of Professor R. T. 

 Jackson of Harvard University, 



