POLYPS AND CORALS. 95 



them is not so strongly spinulose. But some of the outer 

 branches have the stellate cells and rough surface of the 

 ordinary form. The lateral verrucas are rather distant, 

 not very prominent, very oblique and somewhat appressed 

 to the surface. The naked ends of the branches are cov- 

 ered with large, crowded, deep cells, separated by thin 

 walls. The summits of the branches are separated by 

 quite regular intervals, .3 to .4 of an inch broad. The 

 specimen is about twelve inches broad and six high. 



Hawaiian Islands. Rev. Mr. Baldwin, Museum of Yale 

 College. 



POCILLIPORA LIGULATA Dana. 



Zoophytes, p. 531, pl.[50, fig. 2, 2a; Edw. and Hairae, Corall., Ill, 

 p. 306. 



The two original specimens, described by Prof. Dana, 

 are in the Museum of Yale College. 



In mode of branching and form of the verrucas, they 

 resemble some forms of P. aspera, though the branches 

 are more regular and unusually divergent and distant. 

 The longer branches are much compressed, thin and 

 mostly dilated at the ends, .4 of an inch to 1.5 broad, 

 and .3 to .4 thick. The larger branches have very cellu- 

 lar, naked summits ; some of the younger branches are 

 strongly verrucose at the end. The lateral verrucas are 

 well developed, not crowded, ascending, and mostly par- 

 tially appressed to the surface. The lateral cells are 

 rather distant, quite small, neatly stellate with twelve 

 well-developed septa, one of which joins the small, 

 prominent columella. The cosnenchyma is firm, between 

 the cells covered with small, spinule-like grains. The. 

 specimens are about six inches high and broad. 



Hawaiian Islands. Rev. Mr. Baldwin. 



This species is evidently closely allied to .P. aspera, 

 from which it differs chiefly in its smaller and more dis- 

 tant cells, more fully developed septa, and the finer 

 granulation of the coeneuchyma. With a larger series of 

 specimens it might, perhaps, be possible to unite the two, 

 but as yet I have observed no intermediate forms. 



