Transactions of the Connecticut Academy of Arts and Sciences . iding are usually about18 to 20™^ across, rarely 25™™ ; depth of calicle to top of wall,9_12mm -pj^g septa are not very wide, but rather thick distally, andstrongly exsert ; their summits are often wider than the middle por- A. E. Verrlll—Comparisons of Coral Faunae. 179 tion, and rounded, but many are narrowed and angular or subacute ;all are terminated by two to four, more commonly three, strong,sharp, erect teeth, giving the coral a rough and spinose inner edge is usually nearly perpendicular and thinner, andis di
Transactions of the Connecticut Academy of Arts and Sciences . iding are usually about18 to 20™^ across, rarely 25™™ ; depth of calicle to top of wall,9_12mm -pj^g septa are not very wide, but rather thick distally, andstrongly exsert ; their summits are often wider than the middle por- A. E. Verrlll—Comparisons of Coral Faunae. 179 tion, and rounded, but many are narrowed and angular or subacute ;all are terminated by two to four, more commonly three, strong,sharp, erect teeth, giving the coral a rough and spinose inner edge is usually nearly perpendicular and thinner, andis divided into a variable number, usually six to eight, of sharpspiniform teeth, usually pointing strongly upward. These teeth ofthe inner edge are generally decidedly smaller, shorter, and thinnerthan the distal ones, but they are quite variable in size and form,and some of them are sometimes about as large and Avide as thoseof the exsert portion, but not so thick. Sometimes they are allsubequal, but in other places they are very unequal. See figure Figure 12.—l/Mssa annecfens Ver. A series of outlines of the larger septa,from the type specimen, enlarged ; a, 6, two septa with true Mussa denti-tion \ c, d, two septa with dentition of intermediate character ; e, /, twosepta of the Isophyllia type ; g, h, two septa from the outer side of marginalcalicles, to show the character of the costal spines. Drawn by A. H. Verrill. In the type specimens the septa are rather openly arranged, andseparated by interspaces exceeding their own thickness. But in oneexample they are thicker and more crowded. They are unequal inwidth and thickness, according to the three or four cycles that theyrepresent, those of the last cycle being almost rudimentary. Thereare usually seven or eight larger ones to 10°^ in the type. The sidesof the septa are sharply granulated. The columella is well devel-oped, trabecular, and covered with rough, irregularly divergentspines. The under side is strongl
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectscience, bookyear1866
