DESCRIPTIONS OP SPECIES. 135 



plastered over its costse ; therefore I am not sure that it may not be con- 

 nected with the piece of coral which the colony incrusts. A few words 

 should be added about this latter piece of coral. Its length is 22 mm.; 

 the whole is occupied by one zooid. The greater diameter at the larger 

 end is 9 mm., the lesser 6.5 mm. The piece was cut across about 14 mm. 

 from the larger end. Here the greater diameter is 6.5 mm.", and the lesser 

 5.5 mm. There are 48 septa on the section, half of which reach the colu- 

 mella. The columella is large and vesicular. It can not he proved, but 

 I strongl}^ suspect that every part of the coral portion of this specimen 

 belongs to the same species. Possibly excepting the axial piece, which is 

 the object of attachment, I am sure all of the other is of one sijecies, if not 

 absolutely of the same colony. 



After reading the above, one will see that enough material for a thorough 

 vinderstanding of this species has not yet been collected. From the data 

 above given it certainly should be easily identified when foimd in the 

 future. 



Localities, etc. — Already stated in the description. 



Horizon. — Jaclvsouiau stas'e. 



^o^ 



ASTRANGIA LUDOVICIANA Sp. IIOV. 



PI. XIY, figs. 6 to 7. 



Colony incrusting, reproduction by budding from basal expansion or 

 by lateral gemmation. The distribution of the corallites in the colony is 

 shown by the figures. The surface of the basal expansion finely granulate, 

 with or without fine costal striation. The outer surface of the corallites, 

 just below the calicular margins, marked by small but distinct costfB, 

 usually alternating in size. The costfe on the specimen represented in 

 PL XIV, fig. 7a, extend to the basal expansion and are subequal in size. 

 The height of the corallites varies from 0.5 mm. to 1.5 mm.; they may be 

 subcylindrical in shape or slightly constricted at the calice. The diameter 

 of the calices varies from 1.5 to 2.5 mm. The septa have slightly exsert, 

 minutely dentate margins; the paliform dentations are indistinct or absent. 

 The number of the septa varies from 20 to 28, one-half being larger, and 

 usually all of the larger septa reacli the columella. The septal faces granu- 

 late. No dissepiments were seen. Calicidar fossa usually rather deep. 

 Columella very lax, and often broken away altog'ether. 



