54 BULLETIN OF THE 



subturbinate fronds, smooth below, with distant, strong costae, and many 

 smaller intermediate ones. The cells are smaller, less remote, with much 

 thickened, lacerately toothed septa, which become very thin between the 

 cells. Columella rudimentary. — Tahiti ; A. Garret. 



Echinopora flexuosa Verrill. 



Corallum forming broad, thin, foliaceous, flexuous, and contorted plates, 

 often growing upright, cohered on both surfaces with circular, slightly 

 prominent corallites about .12 of an inch in diameter, separated ordinarily 

 about a quarter of an inch. Between the cells the septo-costal stria; are nu- 

 merous, thin, divided into slender, sharp spines. There are two complete 

 cycles of septa, with rudiments of a third ; those of the first cycle arc 

 thickened exteriorly and divided into prominent teeth, which are them- 

 selves lacerate. Columella loose, trabicular, little developed. — Singapore ; 

 Capt. W. H. A. Putnam. 



Echinopora reflexa Dana. 



This differs from E. rosularia Lamk. in having three complete cycles of 

 septa. — Feejee Islands ; J. D. Dana. 



Acanthopora Verkill. — Type, Echinopora horrida Dana. 

 Corallum ramose, solid, the cells being filled below as in Oculina. Costne 

 between the cells represented by series of spines. It differs also from Echi- 

 nopora in its polyps. 



Acanthopora horrida Verrill. 



Syn. Echinopora horrida Dana, Zoophytes, p. 282, pi. 17, f. 4, 4 a, 4 b, 

 4 c, 184G. — Feejee Islands ; J. D. Dana. 



Pavonia formosa Dana. — Tahiti; A. Garret. 



The genus Pavonia was first established by Lamarck in 1801, in Sysleme 

 des Anhnaux sans Vertebres, p. 372 ; therefore this name must be retained, 

 instead of Lophoseris proposed by Milne-Edwards and Ilaime, since it was 



not employed among insects until 181G. 



Pavonia prsetorta Dana. — Tahiti; A. Garret. 



Pavonia frondifera Lamarck. 



Syx. Pavonia frond ifera (pars) Dana; Lophoseris yhmtfj/era M. Edw. 

 and HAIME. — Singapore; Capt. W. H. A. Putnam. 



This species is, possibly, Madrepora ficoides Ellis and Solander. 



Pavonia loculata Dana. 



Syn. Paronia crassa var. loculata Dana; Lophoseris? crassa (pars) 

 M. Edw. and Haimr. — Singapore: Capt. W. II. A. Putnam. 

 This is, perhaps, Madrepora acerosa Ellis and Solander. 



Pavonia venusta Dana. 



Syn. Lophoseris? venusta M. Edw. and IIaime. — Singapore; Capt. 

 W. II. A. Putnam. 



