GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 421 



Genus LEPTORIA Milne Edwards and Haime. 



1848. Leptoria Milne Edwards and Haime, Comptes Rend., vol. 27, p. 493. 

 1917. Leptoria Vaughan, Carnegie Inst. Washington Pub. 213, p. 117. 



Type-species. — Meandrina phrygia Lamarck = Madrepora -phrygia 

 Ellis and Solander. 



LEPTORIA SPENCERI, new species. 



Plate 109, figs. 2, 2a, 3. 



1863. Maeandrina species Duncan, Geol. Soc. London Quart. Journ., vol. 19, 

 p. 424. 



Corallum more or less explanate, with a flatish, undulate upper 

 surface. 



Valleys long and sinuous, shallow, from 3.25 to 5 mm. wide, 

 separated by narrow, but strong colline walls. 



There are 8 or 9 long septa within 5 mm., 18 to 19 within 1 cm. 

 These are rather stout and extend from the wall to the columellar 

 fossa; somewhat thickened in the wall and on their inner ends, where 

 there appear to be paliform knots or lobes. Usually between each 

 pair of larger septa is a very thin septum, which is either short or long. 



The columella is stout and lamelliform. 



Locality and geologic occurrence. — Cuba, station 3473, Rio Canapu, 

 crossing of Manassas trail, Oriente Province, Cuba, collected by Dr. 

 Arthur C. Spencer, for whom the species is named. Cyathomorpha 

 tenuis (Duncan) was obtained at the same place. The geologic 

 horizon, therefore, seems to be that of the Antigua formation of 

 Antigua; but Dr. J. A. Cushman reports Orihophragmina from the 

 same station, and suggests that the formation exposed there is of 

 upper Eocene age. 



The specimen from Antigua referred to by Duncan as " Maeandrina 

 sp." seems to belong to L. spenceri, according to two photographs I 

 have of Duncan's original specimen, No. 12946, coll. Geol. Soc. 

 London. Duncan's specimen has a distinctly lamellate columella. 



Type.— No. 324968a, U.S.N.M. (pi. 109, figs. 2, 2a). 



Paratype.— No. 3249686, U.S.N.M. (pi. 109, fig. 3). 



There is no other known species from the West Indies to which L. 

 spenceri is nearly related. It has closer affinities with the Indo- 

 Pacific species L. phrygia and L. gracilis. L. spenceri has about the 

 same number of septa to the centimeter as Maeandra antiguensis, but 

 it differs from M. antiguensis in having shallower valleys, stouter 

 interserial walls, and its columella is distinctly lamelliform. 



Genus MANICINA Ehrenberg. 



1834. Manicina Ehrenberg, Corallenth. Roth. Meer., p. 101 (of reprint). 

 1848. Colpophyllia Milne Edwards and Haime, Comptes Rend., vol. 27, p. 492. 

 1902. Manicina Verrill, Conn. Acad. Arts and Sci. Trans., vol. 11, p. 84. 



Type-species. — Madrepora gyrosa Ellis and Solander. 



