DESCRIPTIONS OF SPECIES, 



167 



Balanophyllia irrorata (Conrad). 

 PI. XIX, figs. 4 to 11a. 



PI. XIX, fig. 4, drawn from one of Conrad's original type specimens; figs. 5 to 5b, 

 drawings of a typical specimen from Jackson, Mississippi; flg. 6, side view of a 

 septum ; tig. 7, of Gabb and Horn's type of " Trochosmilia" niortoni ; flg. 8, another 

 spe(;imen of var, mortoni; figs. 9 and 10, variety dichotoma Gabb and Horn; 

 figs. 11 and 11a, variety coniformis var. nov. 



1855. Osteodes irrorattis Conrad. Proc. Acad. Nat. Sci. Phila., Vol. YII, p. 263. 

 1860. Trochosmilia mortoni Gabb and Horn. Jour. Acad. Nat. Sci. Phila., 2d ser., 



Vol. IV, p. 389, pi. Ixix, figs. 4^6. 

 1860. CylicosmUia caultfern GabV) and Horn (non Turbinolia {:^=Balanophyllia) caiilifera 



Conrad). Jour. Acad. Nat. Sci. Phila., Vol. IV, p. 389, pi. Ixix, figs. 7-9== 

 1860. GijUvosmilia dichotoma Gabb and Horn. Loo. cit. 

 1866. Osteodes irroratus Conrad. Check List, p. 21. 



1890. Osteodes irroratus de Gregorio. Mon. de la Fauna (-ocenique de I'Ala., p. 256. 

 1896. Balanophyllia irrorata Vaughau. Bull. U. S. Geol. Survey No. 142, p. 51. 



This species may be divided into four fairly distinct varieties by which 

 it will be described, and their relations to one another will be shown. 



Balanophyllia irrorata (Conrad) typical. 



PI. XIX, figs. 4 to 6. 



Corallum elongate, snbconical, may be curved in the plane of the longer 

 or shorter transverse axis of the calice, sometimes straight. Cross section 

 elliptical, attached in the young stages, but subsequently becomes free. In 

 old specimens the scar is covered by a deposit of calcareous matter. 

 The epitheca is very thin, covering the lower portion of the corallum. 

 Costse are rather coarse, acute, usually j^resent a carinated appearance, 

 composed of many small nodules in a single row; branch by trifurcation. 

 When the caringe are worn down a little, the porous character of the costee 

 is revealed. The wall is perforate, thick, and spongy. Septa in five cycles, 

 their surfaces covered with many pointed granules. Near the wall these 

 granules meet, forming syiiapticulse, and thus increase the thickness of the 

 wall. Columella spongy. 



Longer triinsversu axis of calice. 

 Shorter transverse axis of calice 

 Height of corallum 



Mm. 

 18 

 13.! 

 39 





Mm. 

 17 

 13.5 

 30 



Mm. 

 17 

 13.5 

 23 



