148 A. E. Verrill — Bermitdian and West Indian lleef Corals. 



tive and some of the calicles may be in pairs or isolated, polygonal, 

 and astreiform, separated only by angular walls. The principal 

 distinction is in the much larger size of the calicles, which, when 

 full grown, are usually 3.5 to 4 mm in diameter, and in the smaller 

 number and marked inequality of the septa, the primary and second- 

 ary ones being thickened and so wide that they leave only a small 

 central pit, while the smaller septa are much narrower and thinner, 

 and are lacking in part of the systems. The columella is usually 

 solid. Septo-costa? are strong, thin, conspicuously alternately 

 unequal, not crowded, finely granulated. No. 4301, type of Dana. 

 Florida Reefs, etc. ; Yale Museum. Large frondose specimens, 

 12-15 inches broad and about 10 high, from the Bahamas (coll. 

 Whitfield) are in the Arner. Mus., New York. Single fronds may 

 be 225 mm wide ; 200 high ; 44 thick. No. 275. 



Var. c. — gibbosa (Dana)=? vesparlum D. and M. 

 Plate XXVII. Figures 1, la. 



This forms irregular, encrusting, nodular or lobulated masses, 

 without distinct crests. The common base, in the type, is free, 

 striated, and unifacial for some distance, and the edge is thin. The 

 collines are low, mostly reticulated, or very irregular, and often 

 lacking. The calicles are in short irregular series, or isolated, and 

 angular or astreiform. They are nearly as large as in var. Dance. 

 (See i)l. xxvii, fig. 1, from type.) No. 1860. 



Var. d.—pusilla Y .—? 31. Lessoni (D. and M.). 



Plate XXVII. Figure 3. 



This form is almost entirely encrusting, often with the collines 

 abortive, or nearly so, but when present they are small and near 

 together, concentric or reticulated, rounded or obtuse. The calicles 

 are generally irregularly arranged or in short series, crowded, and 

 many are isolated ; they are unusually small (mostly about 1 to 

 1.5 mm , rarely 2 mm ) but otherwise they resemble those of typical 

 agaricites. The septa are about 20 to 24, alternately unequal, rather 

 thick, crowded. The small size of the calicles is the most important 

 character. (PI. xxvii, fig. 3.) No. 1489. 



Var. e. — tenuifolla Dana (under A. crlstata). Forms thin, folia- 

 ceous fronds; calicles small, 1.5 mm across, stellate, scattered, scarcely 

 seriate, collines low, rounded. Similar to var. d, but foliaceous. 



The relations of Lamarcki, which Vaughan refers here, have been 

 discussed under frag ills (p. 144). If it really belongs to agaricites, 



