114 



L. NITIDA. Encrusting; cells ovoid, in juxtaposition, 

 with transverse calcareous bands reaching to the median 

 line; apertures oval. PI. xxii., fig. 3. 



Berenicea nitida, Fleming's Brit. An., p. 533. Lepralia 

 nitida, Johnston's Brit. Zooph., p. 277, pi. 34, fig. 7. 



Hab. On stones and shells, not very rare. Polperro, 

 Goran, Mr. Peach. 



This pretty species rarely exceeds half-an-inch in diameter. 

 It is encrusting, calcareous, and composed of urceolate cells, 

 placed in juxtaposition. When living it is either of a yellow- 

 ish flesh colour or intermediate to a silvery white; but when 

 dead it is dull. The cells though closely approximated are 

 not always arranged in the same order ; sometimes they lie 

 in radiating lines in an alternate manner, the centre, or body 

 of one ceil being opposite to the junction of two in the next 

 row; at others in circles round one centre, and sometimes in 

 an irregular alternate manner, or in no order at all. The 

 surface of the cell is furrowed by from five to nine transverse 

 calcareous bands ; they are dentiform or conoidal, with their 

 bases placed laterally and apices nearly meeting in the centre 

 or median line; but as they do not actually meet, there is 

 a longitudinal line of a plain semi-transparent appearance. 

 The apertures are oval, inclining to a triangular form, armed 

 with two long slender divaricated spines on the distal margin. 

 These differ from the spinous appearances refered to by Dr. 

 Johnston as being produced by the incipient formation of 

 the nest cells; they are long slender hair like appendages 

 which stand prominently from the cells. They, are however 

 rarely to he seen, but in the younger cells, for they are so 

 delicate that the agitation of the sea alone is sufficient to 

 destroy them, and hence they are never found in specimens 

 dredged up, but on!y in those carefully collected and pre- 

 served. 



L. INNOMINATA. Encrusting, cells oval, in circular 

 rows ; sides of the cells with short transverse calcareous 

 bands. PI. xxii., fig. 4. 



Hab. On stones, rare. Goran, Mr. Peach. Polperro. 

 Mount's bay. 



Calcareous, encrusting in patches of about half-an-inch in 

 diameter. The cells are oval, but somewhat contracted at 

 each extremity and inflated about the middle. The sides of 

 the cells, from the intercellular spaces, are marked by short 

 conoidal transverse bands ; they are calcareous and extend 

 for about one-fourth of the transverse diameter; the central 

 and longitudinal half is therefore plain, and is also semi- 

 transparent. The apertures are circular, contracted, and 



