TEREBELLAEIA. 187 



Description of Figure. PL X. Fig. 4. Part of a branch, X 14 

 dia. Bradford Clay : Box, Wilts. Holl. Coll. B. 4872. 



Affinities. This species is allied to M. haimei, Greg., but differs 

 from it by the greater elevation of the peristomes, and by having 

 the zooacia more crowded, and the apertures closer, and often in 

 irregular lines. The differences are shown by the two figures 

 (PL X. Figs. 3 and 4). 



LIST OF SPECIMENS. 



D. 1764. Cornbrash. Woodstock. Brodie Coll. 



D. 2175. Forest Marble. Kellington, Oxfordshire. Brodie Coll. 



B. 4872. Bradford Clay. Box Tunnel, Wilts. Holl CoU. Figd. PI. X. 



Fig. 4. 

 B. 4873. Bradford Clay. Box Tunnel, Wilts. Holl Coll. Large tuft, 



5 inches in diameter. 

 B. 2305. Bradford Clay. Loc. ? 

 D. 1824. Bradford, Wilts. 



D. 1819, D. 1820. Bradford Clay. Tetbury Road, Wilts. 

 D. 2156, D. 2161. Bradford, Wilts. Brodie Coll. 



D. 1784. Inferior Oolite. Gloucestershire. 

 D. 2212. Bathonian. Banville. Tesson CoU. 



TEREBELLjARIA, Lamouroux, 1821. 

 [Lamouroux. Expos. Meth. p. 84.] 



Diagnosis. Clausidae in which the zoarium is arborescent and 

 thick. Zoarial growth is by the addition of Berenecoid colonies 

 on to the ends of the branches ; each colony sends an expansion 

 downward around the stem. (Hence growth is acropetal and 

 exogeneous.) The zocecia are reflexed. The apertures occur in 

 zones separated by interzones of dactylethrse. 



Type species. T. ramosissima, Lamouroux, 1821. 



Affinities. This genus differs from Multiclausa by having the 

 apertures in regular zones instead of scattered throughout the 

 zoarium. It differs from Spiroclausa, D'Orb., by the mode of 

 growth, for in that form (which probably belongs to the Tubulata) 

 the zocecia curve upward and outward, instead of downward. 1 



1 The species named T. increscent, Vine, 1884, is an Entalophora with gono- 

 cysts : see p. 153. 



