86 Rev. A. M. Norman on undescribed 



Their surface is granular, and they are punctured round the 

 margin in the same manner as the cells. Found on stones, 

 from 80 to 100 fathoms, Shetland, 1861 and 1863. 



This species approaches certain forms of L. variolosa very 

 closely ; and indeed it is difficult to point out the distinctions of 

 the two species in words. I have seen, however, a large number 

 of L. laqueata, and they all differ from L. variolosa, — 1st, in 

 having the cells much larger, more rhomboidal, and less elon- 

 gated, wider in proportion to their length, and less regularly 

 arranged in quincunx ; 2ndly, in being invariably tinged with 

 red in living and being ivory-white in dead specimens, and 

 having their surface dull, instead of shining with the bright gloss 

 which is so marked a feature in L. variolosa ; 3rdly, in having 

 the denticle much more deeply seated within the mouth, and in 

 having the ovicells less immersed. 



Lepralia divisa, n. sp. PI. X. fig. 6. 



L. cellulis convexiusculis, glabris, approximatis, in lineis dispositis ; 

 orificii margine superiore spinis sex longissimis armato, inferiore 

 denticulato ; ovicellula globosa, glabra, fissura angusta longitudi- 

 nali parallela infeme occlusa discissa. 



This is an exquisitely beautiful Lepralia, remarkable for its 

 snow-white colour, the linear arrangement of its closely crowded 

 cells, and the very great length of the six spines which surround 

 the upper margin of the mouth. The cells themselves are small 

 and smooth, but have little character, being quite subordinate to 

 the mouth and ovicell, which are the parts of the polyzoary 

 which at once strike the eye ; indeed the cell is generally almost 

 entirely hidden by the superincumbent ovicell of the cell placed 

 immediately beneath it in its own linear series. The mouth has 

 the lower lip furnished with two or three tooth-like points, and 

 sometimes produced outwards into a large spatulate process or 

 flattened umbo. The upper lip, when not surmounted by an 

 ovicell, is furnished, as before stated, with six very long and 

 slender spines. The ovicell is semielliptical, much elevated, but 

 somewhat flattened on the face, which is marked with longitu- 

 dinal lines, and cleft down the centre with a narrow, parallel- 

 sided slit, which is closed below. 



Dredged in 1859, between Guernsey and Herm, on dead 

 shells. 



Lepralia divisa is allied to L. fissa (Busk); but the latter spe- 

 cies may at once be known from it by the presence of a conspi- 

 cuous central sinus on the lower lip, and the absence of the teeth 

 of L. divisa, and by the fissure in the ovicell being triangular, 

 rapidly widening towards and quite open at the base, and not 

 extending so far towards the summit of the ovicell as is the case. 



