﻿3° SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 47 



to this date we have determined, without exhausting our material, 

 no fewer than fifteen species having- the characters above ascribed to 

 Cyphotrypa. Of this number only four, Leptotrypa acervulosa, 

 L. informis, L. semipilaris, and L. stidhami, all of Ulrich, have been 

 described. Only two of the new species are described in this paper. 

 The others must await another opportunity. 



Commencing with the Stones River group, the genus is repre- 

 sented in nearly all of the divisions of the Ordovician. A single 

 new species occurs in the Xiagaran, while another new form in the 

 Helderbergian of Maryland appears to be the last representative 

 of the genus. 



CYPHOTRYPA FRANKFORTENSIS new species 

 (Plate VIII, 7-9) 



The zoarium in this well-marked species forms large, often undu- 

 lating expansions usually 7 cm. or more in diameter and 1 cm. in 

 height ; but sometimes heaped-up masses, 4 or 5 cm. high, occur as 

 the result of the superposition of several layers of zocecia. The 

 surface usually bears small, sharp monticules. Zocecia small, 9 to 

 10 in 2 mm., five or six sided, with very thin walls. Acanthopores 

 rather large and distinct but not abundant, averaging only about one 

 to each zocecium. Diaphragm entirely wanting in the immature 

 region and from one to two tube-diameters apart in the mature zone 

 which is distinguished only by the fact that diaphragms are here 

 developed. 



The large monticulated masses formed by this species, its small 

 zocecia and few acanthopores, and the absence of diaphragms in the 

 immature regions, distinguish it. Small weathered specimens or 

 fragments may be confused with C. acervulosa, which has zocecia 

 of the same size, but as the zocecial tubes are abundantly tabulated in 

 that species, collectors should experience little difficulty in distin- 

 guishing even small fragments. 



Occurrence. — Common in the shaly limestones at the top of the 

 Trenton on Reservoir hill, Frankfort, Kentucky. Less abundant 

 in the vicinity of Burgin, Kentucky, where it seems to occur in a 

 lower bed of the same formation. 



I at. Xo. 4;v'*o. C S. X. M. 



CYPHOTRYPA ACERVULOSA (Ulrich) 



(Plate VIII, 1-3) 



[893. Leptotrypa acervulosa Ulrich, Geol. Minnesota, in, p. 318, pi. 

 xxvn, 24. _>;. 



This widely-distributed species, which we have made the genotype, 

 forms small, irregular or subglobular, smooth masses, 15 to 20 mm. 



