198 SYNOPSIS OF THE CHARACTERS OF THE 



them on one side only, as it seemed impossible to separate generically such species as the F. parallela {Fiustra, 

 Phil.) from such as the F. raricosta, M'Coy. 



ViNCULARIA DICHOTOMA. M'Coy. (PL XXVII. fig. 15). 



Sp. Ch. — Dichotomous ; obverse rounded, with about six equal, parallel, slender, longitudinal ridges, in 

 the concave furrows, between which are five rows of oval, prominent cells, the marginal furrow on each side 

 free of cells ; reverse flat, with numerous, semicircular, scale-like wrinkles, and about six longitudinal striae. 



When seen with the flat side up this curious zoophite resembles Ellis and Solander's Galaxaurn mariji- 

 nata of the Bahama Islands more than any other coral; the obverse, however, resembles that of the F. parallela, 

 Phil. Common. Width of branches one line, length from one to three inches (imperfect). 



ViNCULARIA MEGASTOMA. M'Coy. (PI. XXVII. fig. lU). 



Sp. Ch. — Elongate, slender ; section eUiptical, obverse with about three rows of large, subrhomboidal cells 

 arranged alternately, the rows slightly inosculating ; the sharp spaces intervening between the cells form longitu- 

 dinal, wavino- ridges, and marked with waving, longitudinal strias ; reverse without cells striated longitudinally. 



This pretty little coral is about the size of the M'dlepora (/racilis, Phil, from which it differs in the large 

 size and small number of the cells, and by having the cells on one side only; from the F. raricosta, M'Coy, 

 it is distinguished by wanting the straight parallel ridges, and by the great size, rhomboidal form, and small 

 number of the cells, and the flexuous and striated character of the intercellular spaces ; from the Millepora 

 rhombifera, Phil., it also differs in the large size and small number of the cells. Length of specimens usually 

 about three or four lines, diameter about onc-fuurth of a line. 



ViNCULARIA PARALLELA. Pliil. SP. 



Fiustra parallela. Phil. Geol. York. 



Sp. C/(.— Linear, thin, flattened, membranous; about six or seven longitudinal ribs on each side; between 

 each pair is a row of large, oval pores, with raised margins ; sides smooth, without pores. 



This coral presents most essential differences from the recent genus Fiustra. It varies somewhat in size, 

 thickness, and the number of the longitudinal furrows. Length from one to two inches, width half a line. 



ViNCULARIA RARICOSTA. M'Coy. (Pl.XXVII.fig.il). 



Sp. Ch. — Elongate; sides parallel; section elliptical; most convex on the porous side; poriferous face con- 

 vex, marked with fine, sharp, parallel keels, enclosing between them four rows of pores ; pores round, or slightly 

 oval, with prominent margins, placed twice their diameter apart, but irregularly with regard to each other ; re- 

 verse flattened, faintly marked with exceedingly fine, numerous, waving strias ; sides indented each by a pro- 

 minent row of pores. 



This coral is distinguished from the Fiustra parallela, Phil., by having pores in the lateral furrows, and 

 the sides strongly indented by prominent rows of pores, and from the F. multanqularis, Portk., by the larger 

 size, and much less number of the longitudinal rows of pores, and by having them on one side only. Length ot 

 specimens usually about one inch, widtli rather more than half a line. 



Glauconome. Lonsd. (not of Gold.) 



Gen. C'/(.— Stem elongate, oval, laterally branched; obverse bearing longitudinal rows oi' pores; reverse 

 striated. 



I have assigned this genus to JMr. Lonsdale, rather than to Professor Goldfuss, as the former author was 

 the first to point out the true characters of those elegant corals. 



