530 ZOOPHYTA. TUBIPORAMJ. Discopora. 



larged globular heads, radiated with plates of united vertical 



cells. 



In deep water, Zetland. 



About an inch in height, the branches scarcely exceeding one-eighth ; the 

 branches are short, pierced by numerous pores, the openings of cells con- 

 verging towards the centre ; the head is stellate, the rays are highest in the 

 middle of their course, diminishing towards the centre and lower margin of 

 the head ; each ray is compressed, and consists of two rows of tubular cells, 

 united, crowded, with subangular orifices ; the tubes have a central direc- 

 tion, and give to the sides of the plates a striated appearance. This species 

 has probably been referred to as an inhabitant of the north seas, under the 

 title of Millepora truncata, but it differs widely from ths Myriosoos of Donati, 

 to which the term was restricted by Pallas. 



Gen. XL VII I. DISCOPORA.— A subcircular crust, adhering 

 in the middle, circumscribed, and raised at the margin, 

 forming a cup, bearing on the inside a disc of tubular cells. 



121. D. verrucaria. — Margin thin, concentrically wrinkled, 

 disc with the centre nearly smooth, the tubular cells diverging 

 and submarginal. 



Madrepora verrucaria, Linn. Syst. i. 1272. Pallas, El. 280 Millepora 



verr. Sol. Ellis Zooph. 137— On fuci and corallines, common. 

 About a quarter of an inch in diameter ; the centre is generally punc- 

 tured with the traces of the obliterated rays, the tubes are sometimes slight- 

 ly cohering, and disposed in rays ; the orifices are round and simple. 



122. D. hispida. — Margin thin and waved, the cells distri 



buted or radiated, with denticulated orifices. 



Coral resembling the cups and foliage of flowers, Cordiner's Ruins, 

 No. xxii — On corallines from deep water, Zetland. 



Breadth nearly an inch ; hispid, the cells seem distributed over the whole sur- 

 face, and more vertical than the preceding ; there are, however, waved porous 

 grooves, and the cells seem disposed on each side of these in irregular trans- 

 verse rows, united or free, short, with expanding orifices, dividing into irre- 

 gular spinous processes. This species is very common in Zetland, adhering 

 to Cellepora cervicomis, and the figure of Cordiner is a tolerably accurate re- 

 presentation. He does not, however, state his examples as Scottish. 



Gen. XLIX. FILIPOltA. — Massive, consisting of numerous 

 long, cylindrical, linear tubes, slightly branched, variously 

 united and twisted. 



123. F '. Jilograna. — Tubes about g^th of an inch in diame- 

 ter, fasciculating and twisting, forming large irregular meshes. 



Serpula filograna, Linn. Syst. i. 1265 S. corallifica, Pallas, El. 239 



Common on old shells and the roots of fuci a little beyond low water- 

 mark. 



The masses sometimes occur upwards of a foot in diameter ; the tubes are 

 slightly wrinkled transversely, and nearly of equal size throughout, except 

 where divided; the colour is white. 



