NORTHUMBERLAND AND DURHAM. 143 



2. M. piLOSA, Linn. 



Johns. Brit. Zoopli., 327, t. Ivi., f. 0. 



Busk, Catal., 56, t. Ixxi. 

 Investing tlie stems of small sea-weeds, on Laminaria^, 

 shells, &c., between tide-marks, and in shalloAV water; 

 very abundant. More rare in deep water. 



3. M. LINE ATA, Linn. PI. X., %. 1, la. 



Cells oval; the margin with 4 or 5 spines on each side, 

 bending inwards, generally rather slender and not flat- 

 tened at the sides. Ovicapsule large, galeate, slightly 

 frosted, with an arched rib near the top. Avicularia 

 subsessile or a little elevated, situated on one or both 

 sides of the ovicapsule, more rarely at the top; and 

 sometimes at the bottom of the cell. 



Flustra Uneata, Linn. Syst. Nat., 12th Ed., 1301. 



„ Johns. Brit. Zooph., 349 (part). 



Memhranipora lineata, Busk, Catal., 58, t. Ixi. 

 On shells, &c., from within tide-marks to deep water; com- 

 mon. Frequent on Patella laevis. 

 It is difficult to say whether this is the Flmtra litieata of Lin- 

 naeus, or whether, as is probable, he included more than one 

 species under that name ; but as he mentions only 8 spines, and 

 the allied species, as here distinguished, have more, this may 

 fairly be taken as the type, the more especially as it is certainly 

 the If. lineata of Professor Busk, the only author whose figure 

 can be recognised with certainty. 



4. M. spiNiFERA, Johns. PI. X., fig. 2, 2a. 



Cells oblong-oval ; the margin with numerous stout, linear 

 or subclavate spines, about 7 on each side, erect or leaning 

 inwards. Ovicapsule seldom present, shallow, smooth, 

 with two or more spines? Avicularia on the top of club- 

 shaped spines, developed sparingly on any part of the 

 margin of the cell. 



Flustra spinifeixi, Johns, in Newc. N. H. S. Trans., 

 V. 2, p. 266, t. ix., f. 6. 



Flustra? lineata, Johns. Brit. Zooph,, 349 (part). 

 VOL. in. PT. n. s 



