NORTHUMBERLAND AND DURHAM. 157 



brandling or anastomosing, with occasional short, spinous 

 ofifsets: cells ovate or flask-shaped, rather ventricose, ta- 

 pering towards the orifice, the margin of which is thick- 

 ened and slightly nodulous ; sides of the cells produced 

 into in-egular, flattened spines, adhering to the sub- 

 stance on which it creeps. 

 On Plumularia falcata^ Companularia dumosaj &c., from 

 deep water; rather rare. — J. A. On a stone at low-water 

 mark, Whitley. — J". Coppin, Esq. 

 This interesting little zoophyte has probably hitherto escaped 

 observation from its minuteness. The processes at the sides 

 give the cells an insect-like appearance: they are irregular and 

 occasionally wanting. The cells are also suliject to some varia- 

 tion in form, especially in the size of the aperture: they lie 

 nearly parallel to the stem, which frequently divides and runs 

 along each side of them, clasped by the lateral processes. The 

 animal, when excerted, extends considerably beyond the cell, 

 and has eiarht shortish and rather stout tentacles. 



•■fD' 



V. JTVA, Linn. 



48. VALKERLi, Fleming. 



Johns. Brit. Zooph,, 375. 

 In tide-pools, on Corallina officinalis; frequent. 



49. BOWERBANKIA, Farre. 

 1. B. iMBRicATA, Adams. 



Johns. Brit. Zooph., 377, t. Ixxii., f. 5, 6. 

 fi. Bowerhanlda densa, Farre in Philos. Trans., An. 

 1837, p. 391, t. XX., xxi. 

 In tide-pools, on Corallina officinalis ; frequent. 

 Tlie Boicerhanlda usually found on our coast is tlie densa of 

 Farre, which, in deference to tlie rtpinion of others, is here 

 ranked as a variety, though I am inclined to tliink it a distinct 

 species. Independently of liabit and mode of growth, it is diffi- 

 cult to get a character to distinguish the species of this genus, 

 or of Valkeria. B. densa growls in small compact tufts in rock- 

 pools, about half-tide level, principally on Corallina officinalis; 



