118 



L. CILIATA. Encrusting; cells inflated, slightly rough; 

 apertures round, contracted, armed with about six bristles 

 on the distal and lateral margins. PI. xxii., fig. 10. 



Berenicea utriculata, Fleming's Brit. An., p. 533. Le- 

 pralia ciliata, Johnston's Brit. Zooph., p. 279, pi. 34, fig. 6. 



Hab. On stones and shells, from near low water mark to 

 deep water. Whitsand bay, Polperro, Goran, &c. 



This species is membrano-calcareous, encrusting, thin, 

 white, and spreading in a circular manner from about one inch 

 to one and half inch in diameter. The cells are distant, or not 

 in contact, ovato-globose and semi-erect. The apertures are 

 terminal, contracted and armed with from five to seven teeth 

 or spines on the distal and lateral margins. These spines 

 from their brittleness, are commonly distroyed in preserved 

 specimens, and most have but their mutilated remains. 



L. TRISPINOSA. Encrusting; cells oval, closely ar- 

 ranged ; surface roughish ; apertures terminal, armed with 

 three long conoidal spines on tbe distal margins. 



Lepralia Trispinosa, Johnston's Brit. Zooph., p. 280, 

 pi. 34, fig. 5. 



Hab. On stones and shells from deep water, rare. 

 Polperro. 



Encrusting, thin membrano-calcareous, and white but 

 freckled with yellow. Tbe cells are elongated and oval, and 

 horizontal and radiating. Tbe apertures are raised, ovoid, 

 witb a notch on the proximal, and armed with three long 

 conical spines on the distal lip. 



L. IMMERSA. Encrusting; cells oval, immersed; aper- 

 tures oval, with a tooth on the proximal and from five to 

 seven spines on the distal lip. 



Berenicea immersa, Fleming's Brit. An., p. 533. L. im- 

 mersa, Johnston's Brit. Zooph., p. 280. PI. xxxiv., fig. 8. 



Hab. On stones a few miles from the shore. Polperro. 



This is encrusting, irregular, and much thicker then L. 

 ciliata, which it somewhat resembles. It is rough, or 

 minutely granular, and of a yellowish amber colour. The 

 cells are ovato-globose, and immersed; the apertures are 

 nearly circular, but slightly transversely ovoid, armed with 

 a blunt tooth on the proximal and several spines on the 

 distal lip. The spines are brittle and consequently are fre- 

 quently destroyed or injured. 



WEMBRANIPORA. 

 Generic Character: Polypidom encrusting, membrano- 

 calcareous, spreading irregularly, formed of a single layer 



