46 BULLETIN 96, UNITED STATES NATIONAL MUSEUM. 



_ . . / , • X fAi»e= 0.10-0.15 mm. 

 Measurements. — Penstomice (exterior) 7„g_0 i5_o 20 mm 



,. , . J Ape =0.12-0. 15 mm. 

 Apertura (interior) / a io a i - 

 ^ ^ ' \ Z/>e=0.12-0.1o mm. 



. [Zs=0.90 mm. 

 Zooecia , a oa a m 



[ 7.e=: 0.30-0.40 mm. 



This species with its enormous, solid walls, appears robust and 

 resistant. Nevertheless, this is not the case. It was rapidly exter- 

 minated and never had a large geographic distribution. This is 

 frequent in the bryozoa, where pliancy is a better sign of longevity 

 and resistance. 



Occurrence. — Vicksburgian : West bank Conecuh River, Escambia 

 County, Alabama (very common). 



Tyfe.—Q^X. No. 62593, U.S.N.M. 



ENOPLOSTOMELLA, new genus. 

 {Enoplis, armed; stoma, mouth.) 



The apertura and peristomice of the ovicelled zooecia are identical 

 with the apertura and peristomice of the ordinary zooecia. The 

 frontal is a tremocyst with wide-mouthed tubules. The ovicell does 

 not entirely surround the peristomice. There is an avicularium in 

 the peristomie in the immediate vicinity of the peristomice. 



Genotype. — EnoplostoTnella defixa, new species. 



Range. — Jacksonian- Vicksburgian. 



ENOPLOSTOMELLA DEFIXA, new species. 



Plate 4. fig. 8. 

 Description. — The zoarium is free, cylindrical, vinculariform, 

 formed of from 6 to 7 longitudinal rows of zooecia. The zooecia are 

 indistinct ; the frontal is little thickened, convex, formed of a tremo- 

 cyst with large tubules placed above an olocyst with pores. The 

 apertura (interior) is formed of a semilunar anter and of a concave 

 poster; the peristomice (exterior) is elongated, embedded, provided 

 with a triangular rimule-spiramen. The ovicell is hyperstomial, 

 buried in the distal zooecia, globular, salient, decorated with large 

 tremopores; it opens largely into the peristome. The oral avi- 

 cularium is adjacent to the peristomice and placed somewhat ob- 

 liquely; it is triangular, rather long, and provided with a pivot; the 

 beak is turned outward. 



. K J. /• ^ • \ fA«=0.15 mm. 

 Measurements. — Apertura (interior) , „^„ 



i "- ' [ 7(2=0.15 mm. 



^ . , . . , . N [Awe=0.14-0.16 mm. 

 Penstomice (exterior)} ^^,^^0.18-0.20 mm. 



. fZ2=0.90-1.00 mm. 

 Zooecia , „ .„ 



[ ?s=0.40 mm. 



