428 BULLETIN 103, UNITED STATES NATIONAL MUSCUM. 



Locality and geologic occurrence. — Limon, Costa Rica, Moin Hill, 

 "Niveau a," collected by H. Pit tier, probably Pleistocene. 



As has been stated this is in reality only a vegetative growth form 

 of Agaricia agaricites var. purpurea. It is especially abundant 

 on the reefs off the west side of Andros Island, Bahamas. 



AGARICIA AGARICITES var. PUSILLA Verrill. 



1902. Agaricia agaricites var. pusilla Verrill, Conn. Acad. Arts and Sci. Trans., 

 vol. 11, p. 148, pi. 27, figs. 3. 3a. 



Locality and geologic occurrence. — Canal Zone, station 6039, Pleisto- 

 cene, Mount Hope, collected by D. F. MacDonald, moderately 

 abundant. This variety was originally based on specimens from 

 Colon, Panama. 



AGARICIA ANGUILLENSIS, new species. 



Plate 108, figs. 2, 3, 4. 



Corallum rather low, consisting of crispate, divided, and lobed 

 fronds. Height or extension from the center, 44+ mm. Thickness, 

 3 to 4 mm; thinner on the edges. 



Calices unifacial, sub concentrically arranged, mother calice excen- 

 tric. In the type-specimen, the distance from the mother calice to 

 the edge of the frond is 35 mm., with five rows of calices, the outer- 

 most calice 6 mm. from the margin, making 7 mm. the average dis- 

 tance between the rows, the distance varies from 5 or 6 to 9 mm. 

 The lower side of the rows is very slightly swollen; the ridges are almost 

 suppressed. Transverse diameter of calices 3 to 7 mm. On the 

 upper side the septo-costae are directly continuous without elevation 

 to the next series. Under side of frond finely striate. 



The septa vary in number from 15 to 38, alternately larger and 

 smaller, arranged in three cycles; 6 to 12 septa are decidedly larger 

 and thicker than the others. The septo-costae are solid and coarse, 

 alternately larger and smaller. Synapticulae abundant. 



Calicular fossa shallow. Columella stout, composed of two or 

 three large papillae that fuse to form an axial tubercle or an axial 

 lamella. 



Localities. — Island of AnguiUa, West Indies; collected by P. T. 

 Cleve. 



Type. — University of Upsala; duplicates in the United States 

 National Museum (Cat. No. 324971). 



One of the striking characters of this species is the slight tumidity 

 of the lower side of the calices; otherwise it closely resembles Aga- 

 ricia dominicensis, the species next to be described. 



AGARICIA DOMINICENSIS, new species. 



Plate 109, figs. 1, la. 



The type is a fragment of a frond, 27.5 mm. long, 23 mm. wide, and 

 from 1 to 2.5 mm. thick on the lower edge, exclusive of the cahcular 



