DESCRIPTIONS OF SPECIES. 169 



Balanophyllia irrorata var. dichotoma (Gabb and Horn). 



PL XIX, figs. 9 and 10. 



1860. GylicosniiliacauliferaGa.bb and Horn (non Turhinolia(= Balanophyllia) caulifera, 

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

 Gabb and Horn suspected that this might not be Conrad's species, they pro- 

 posed the alternate name G. dichotoma. 



Shape subcorneal, slightly compressed, attached in young stages but 

 free m adult stage. Costte well developed, strong, usually composed of a 

 single series of granules, slightly carinated, branch by trifurcation. Wall 

 strong, shows few vesicles. In both of the type specimens there is a rather 

 abrupt increase in size of the corallum a short distance above the base, 

 giving the corallum a slightly shouldered appearance. Septa in five 

 cycles; in the upper portion of the corallum they are thin and delicate; in 

 the lower portion thick and strong. Their surfaces granulated. Columella 

 vesicular. 



Greater diameter of calice, about 



Lessei' diameter of calice, about 



Height of corallum (from base to upjjer edge of wall) 

 Height of corallum (to end of projecting columella).. 



Localities. — Caldwcll Couuty, Texas; Alabama Bluff, Trinity River, Hous- 

 ton County, Texas. 



Geologic occurrence. LoWCr ClaibomC. 



Types. — Gabb's original specimens in Philadelphia Academy of Natural 

 Sciences. Of the two original specimens of this species, the one that is 

 figured here appears abruptly truncated; the other specimen, which is much 

 smaller, comes to an obtuse but rounded end. 



Since the above was written, Mr. C.W.Johnson, of the Wagner Institute 

 of Science, has collected five good specimens (and one other specimen, proba- 

 bly a young individual) of this variety, at Alabama Bluff", Trinity River, 

 Houston County, Texas. The specimens show a basal scar of attachment. 

 The largest specimens are free and have a rounded base, as in Eupsammia 

 elaborata. The basal scar on three specimens is quite large; on one it is 2 

 mm. across. These scars probably would not be entirely obliterated. 



