230 SYSTEMATIC PALEOA'TOLOGT 



Locality, Claiborne, Alabama/ 



The following- description is based on material from Greggs Land- 

 ing, Alabama, in the United States National Museum: 



The corallum is snbconical or subcnneiform, the cross-section is ellip- 

 tical. The base is rather obtuse, usually rounded; very frequently on 

 the tip is a minute scar, showing that the corallum, in its early stages 

 at least, is attached. The adults are evidently free, and the basal scar 

 may be obliterated. The coralla are usually straight, but sometimes the 

 apex of the base may be nearer to one end of the long transverse axis 

 than to the other. There is no epitheca. The costae correspond to all 

 septa; they are equal, fine and crowded; they are acute, with beaded 

 margins; nearly always have along the summit a single row of granules; 

 extremely rarely the row may be double for a short distance. The septa 

 are thin, weak, arranged in five complete cycles, six systems, with the 

 typical Eupsammid scheme of anastomosing. The granulations on the 

 septal faces are rather low. The columella is lax, spongy, fairly well 

 developed. 



12 3 



mm. mm. mm. 



Greater diameter of calice 13 14 12 



Lesser diameter of calice 10 11.5 10 



Height 17.5 18.5 11 + 



The specimens from Virginia are usually more slender than those 

 from Alabama. Fig. 12 represents one of these slender specimens. 



The following is M. de Gregorio's original description of PlacosmiUa 

 (Trochosmilia) connivens de Gregorio. 



" Tr. conoidea, simplex, elegans, calice elliptico, paulo excavato; sept is 

 numerosis in 6 cyclos dispositis, laminaribus, tenuibis, valde angulosis 

 spinulosisque, apud columellam vix incrussatis; columeUa carente vel 

 cellulosa, ficta; costulis exterioribus confertis, minutis, granulosis." 

 Translation: " Tr. conoid, simple, elegant; calice elliptical, slightly 

 excavated; septa numerous, disposed in 6 cycles, thin, delicate, with 

 very sharp minute spines, thickening near the columella; columella ab- 



' Doubtful. It is probable that Conrad has assigned a wrong locality to the 

 specimen. 



