TEEMACYSTIA. 175 



Tkemactstia anastomans, Mant. sp. (Plate XXXIV. figs. 4, 4 a, 4 i, 4 c.) 



1848. Verticillopora anastomans, Mant. Wonders of Geology, p. 636, f. 3. 



1854. Verticillopora anastomans, Mant. Medals of Creation, 2nd ed. vol. i. p. 227, f. 4, and 



p. 229, f. 3. 

 1854. Verticitlopora anastomans, Sharpe, Quart. Journ. Geol. Soc. vol. x. p. 195, t. 5. f. 1. 

 1869. Disccelia helvetica, Loriol, pars, Mon. Foss. de Landeron, p. 65, t. 5. f. 4-7, 9-11. 

 1874. Verticillites anastomans, Davey, pars. Trans. Newb. Field-Club, p. 13. 

 1878. Verticillites anastomans, Zitt. Studien, III Ab. p. 28; idem, Hand, der Pal. p. 190, 



f. 106. 



1882. Barroisia anastomans, Steinm. Neues Jahrbuch, Bd. 2, p. 164, t. 8. f. 1. 



1883. VerticelUtes anastomans. Keeping, Fossils of Upware &c. p. 145. 



1883. Verticillites anastomans. Carter, Ann. & Mag. Nat. Hist. ser. 5, vol. ii. p. 21 ; ib. 

 vol. iii. p. 26. 



Sponges growing in bushy masses, up to 67 mm. in height and 70 mm. in widtli ; 

 of cylindrical, branching, usually upright stems or tubes, from 4 to 6 mm. in thick- 

 ness, which are either free or coalesce laterally. The interior of the tubes is divided 

 into a series of cylindrical chambers by nearly horizontal partitions, about 1'5 mm. 

 apart. There is a continuous axial cloacal tube, about 1"5 mm. in diameter, which is 

 perforated by circles of relatively large lateral apertures opening into each chamber. 

 The outer surface is even, or faintly shows annular constrictions. 



The walls vary, even in the same specimen, from '5 mm. to 1 mm. in thickness; 

 they are perforated by very minute irregular pores, which are merely the interspaces 

 between the fibres ; in some cases the perforations in the interior partitions are sub- 

 circular, and about "16 mm. in width. In the thin sections which I have examined, 

 only the larger three-rayed spicules of the dermal layer can be seen ; but there are 

 traces of filiform spicules similar to those of T. D' Orbignyi. Mr. Carter states that 

 the spicular structure resembles that of this last-named species, and that the surface 

 is confronted by a crust of pin-like spicules with their heads outwards. 



This species is readily distinguished from others of the genus by its bushy growth, 

 the regular cylindrical form of the tubes, and more particularly by the thickness of 

 the walls. 



Distribution. Lower Green Sand: Farringdon, Berkshire, and Upware, Cam- 

 bridgeshire. 



Teemacystia ikeegulaeis, Hinde, n. sp. (Plate XXXIV. fig. 5.) 



Sponges forming colonies of straight or curved cylindrical tubes, from 7"5 to 

 9 mm. in diameter, and reaching to 62 mm. in height. The interior is divided by 

 depressed convex partitions into a series of chambers, from 1'25 to 1"75 mm. in 

 height, some of which extend the width of the tube whilst others are cyst-like. The 

 siphonal tube is continuous, about 2 mm. in width, and provided with lateral aper- 



