524 yerrill, JVotes on Itadiata. 



twelve cylindrical, light brown tentacles, with white tips, but the tips 

 are not perceptibly swollen, and they are 7iot held altei-nately upright 

 and horizontally, as in Pocillipora.'''' — F. H. B. 



Pearl Islands, Panama, and Acajutla, — F. H. Bradley. " In more 

 sheltered situations near the head of Panama Bay, this coral covers 

 considerable surfaces, but farther out it seems to be confined to 

 sheltered spots, and occurs in scattered clumps." — F. H. B. 



This species forms loose open clumps of rather slender and irregular 

 branches, quite unlike those of the preceding species in appearance. 



Family, Astkangid^ Verrill. 

 Cladocoracece. ami Astrangiacece Bdw. and Haime, CoralL. ii, pp. 587 and 606. 



The coralla in this group consist of encrusting, creeping, or more 

 or less fasciculated clusters of rather small, cylindrical, or somewhat 

 turbinated corallites, which have rather deep, cup-shaped, mostly cii'- 

 cular calicles. The buds arise chiefly fi*om the lateral walls, either 

 from near the top, on the sides, at the base, or even on basal stolon- 

 like extensions. In young specimens and at the margins of encrust- 

 ing species the calicles are often appressed to the surfaces to which 

 they adhere, and buds arise, also, from within the extending outer 

 margins of the calicles. 



The septa form from three to five or more, unequal cycles, the pri- 

 maries and secondaries often with subentire summits, the others 

 denticulate or deeply incised. The columella is variously developed, 

 often papillose. The transverse dissepiments are few and distant. 

 Cffnenchyma wanting or but slightly developed. 



The polyps are quite exsert, with slender, tapering tentacles, which 

 are swollen at the tips, and covered with minute scattered verrucae, 

 composed chiefly of nettling organs. 



This family includes two groups distinguished by Edwards and 

 Haime : Cladocoracece, in which the budding is lateral and the corals 

 consist of more or less caespitose clumps of tubular corallites; and 

 Astrangiacece, in which the budding is mostly basal, or from creeping 

 stolons, producing low encrusting corals. 



But these two modes of growth pass by almost insensible gradations 

 into each other. Thus there are species of Glaclocorci. in which the 

 budding is partially at or near the base, as it is in all the species while 

 young, and there are certain species of Astrangia which bud at the 

 same time from basal expansions, from within the margin of the outer 

 calicles, and laterally from the walls near the summit [A. Dcmm and 

 A. astrceiformis) ; while other species bud both from stolons and 



