48 THE CRAG POLYZOA. 



entertained with respect to the identity of his species with that of the Crag ; the only 

 apparent discrepancy in his description is the statement, that in L. biaperta the cells are 

 disposed in radiating lines, rather than in regular quincuncial order, as they appear to be 

 in all the Crag specimens. 



§ 2. iNARMATiE. 



{a) With oral spines. 

 16. L. VARIOLOSA, Johnst. PI. IV, figs. 4 and 8, and PI. VIII, fig. 8. 



Cellulis ovatis, immersis, in seriebus linearibns plerumqne dispositis, marginem versus 

 puncturatis seu areolatis, superficie granulosa vel puncturata. Orificio orbiculari seu sub- 

 quadrangulari, 2 — 4 spinis marginalibus approximatis supra armato ; peristomate antice 

 elevato, infra intusque denticulum bifidum ostendente. Ovicellulis alte immersis, ad 

 marginem areolatis. 



Cells oval, immersed, usually disposed in linear series, punctured or areolated round 

 the margin, surface granular or punctured ; orifice orbicular or subquadrangular, with two 

 (or four) close-set marginal spines behind ; peristome projecting in front ; a bifid denticle 

 within the orifice. Ovicells deeply immersed, areolated round the margin. 



Lep. variolosa, Johnst., Brit. Zooph., 2d ed., p. 278, pi. xxxiv, fig. 4 ; Busk, Brit. M. 

 Cat., part ii, p. 75, pi. Ixxiv, figs. 3, 4, 5, pi. Ixxv. 



Habitat.— C. Crag, on shell, S. JF. 



This is one of the more variable species of Lepralia, exhibiting such great diversity of 

 aspect under different circumstances, as to cause considerable difficulty in its diagnosis. 

 Three common varieties are represented in the Plates. At PI. IV, fig. 4, is a variety 

 without apparent spines, and at fig. 8, one in which the peristome is inordinately pro- 

 duced in front, whilst the two oral spines are perceptible ; these are more clearly shown in 

 the specimen figured in PI. VIII, fig. 8, in which all the characters of the species are best 

 exhibited. 



17. L. Peachii, Johnst. PI. V, figs. 6, 7, 8 ; PI. VI, fig. 4. 



Celluhs quincuncialibus seu seriatis, ovatis, ventricosis, supra suberectis, umbonatis, 

 superficie glabra vel granulosa, serie unica punctorum basim circa oniatis. Orificio supra 

 arcuato, infra coarctato, infra dente medio lato labium intus, armato ; 4 — 6 spiiiis mar- 



