70 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



able angle : it is cylindrical, and much less in diameter than the 

 adjacent portion of the fasciculus. The mouths themselves are not 

 arranged in a line, or in the same manner as the tubuli, but grouped 

 so as to occupy the least possible breadth ; they are small, rounded 

 on the exterior side, but flattened or angular at the points of contact. 

 Locality. Timber Creek. 



4. Cellepora tubulata Lonsdale. Sp. n. 



a. Portion of a branch of the natural size. 



b. The same magnified, to show the elongated characters of the central cells. 



c. Magnified, elongated cells from the interior of the branch, with a perfect 

 mouth and foramen under the proximal lip. The microscopic pores in the walls 

 of the cells are likewise given. 



Branched; branches round, dichotomous ; cells irregularly ag- 

 gregated, ovoid elongated or tubular ; mouth semicircular, large ; 

 proximal lip straight with a minute foramen in the centre. 



The external surface of the branches rarely presents cases of 

 perfect cells. Where they occur, they exhibit the usual ovoid 

 form, and the mouth is well defined, being bounded completely 

 by the distal arched covering of the cell ; there is also a foramen 

 under the proximal lip. More generally the surface presents a 

 confused congeries of circular or angular openings, leading into 

 ovoid cells. Internally, the branches exhibit, when fractured 

 transversely or longitudinally, a perfectly tubular character in the 

 cells comprising the axis of the branch (o), the cells being of great 

 length and angular from lateral interference or compression ; but 

 towards the distal termination, as displayed in one instance, the 

 ovoid form of the ordinary condition is assumed, by a swelling 

 outwards, and the mouth is bounded by a regularly curved surface, 

 the proximal lip being also supplied with a minute foramen (c). The 

 prevailing form of the cells composing the mass of the branches is, 

 however, ovoid, but variable in outline as well as in size and position. 

 The cells are also much more numerous than is represented in fig. b. 



The minute foramen on the proximal lip was probably con- 

 nected with the base of the spinous process, so frequently exhibited 

 in recent and fossil species of Cellepora. On the surface of the 

 sides of the tubular cells, and also on those of the ovoid, minute 

 connecting foramina may be detected, well defined, and occasionally 

 bounded by an opaque, or thickened, circular line. 



Localities. Lewis's Creek (South Washington, North Carolina), 

 and Timber Creek. 



