234 bulletin: museum of comparative zoology. 



By comparing the description given above of liilli, with Reups's excellent 

 description of acutimargo,^ the close relationship of the two species will be 

 very apparent. 



CLADOCORA, Ehrenbekg. 

 Cladocora jamaicaensis, sp. uov. 



Plate XXXVI. Figs. 5-7. 



One specimen has been submitted to me. It consists of many branches 

 of Cladocora firmly embedded in an indurated matrix of dark colored calcare- 

 ous sand and clay, or argillaceous limestone. In places the matrix is stained 

 yellow by oxide of iron. 



The greatest length of the branches could not be made out, but one piece 

 measured at least 65 mm., and another 50 mm. The following will show the 

 size, in millimeters, of the corallites in cross section. The numbers marked 

 by asterisks are young. 



The distance apart of the branches in the colony is variable, but they 

 are not much crowded, the usual distance being from 3.5 to 7 mm. To be 

 sure, in some instances the branches may be closer together or farther apart. 

 No epitheca was observed. The out.'^ide of the corallites is marked by low 

 acute costae, corresponding to all septa. In size they may vary according 

 to the cycles of septa to which they respectively belong, or may be subequal. 

 The septa are in four complete cycles, and there may occasionally be some 

 members of the fifth. The larger septa show thickenings on their inner ends, 

 probably pali. There are not many dissepiments, those present are thin and 

 belly inward toward the centre of the corallite. The columella is variable in 

 its development : in one young calice there is no columella, the axial space 

 being vacant ; in other corallites there are a few processes from the septal 

 ends forming a very insignificant false columella, while in others the septal 

 processes have formed a distinct well developed false columella. Reproduc- 

 tion by lateral gemmation, two buds may stand opposite each other, as in Fig- 

 ure 6, Plate XXXVI. 



Locality. Solomon Mountain, west of Mint, Westmoreland Parish (R. T. 

 Hill, collector). 



Type. Collection of ^Museum of Comparative Zoology. 



1 Op. at., Vol. XXXIII. pp. 26, 27. 



