Polyzoa, Goelentercdaf and Sponges. 449 



centre. Limits of younger cells undefined, those of the older 

 cells more evident, owing to their greater convexity. Mouth 

 of cell well represented by Smitt's figures ; in one case the 

 form was that of fig. 77« on the same plate {Eschara secun- 

 daria) ; the hinder part is deeply sunk. Lateral avicularia 

 may be absent or only one to a cell, generally distinct and 

 elevated on prominences which are distinctly tubular and 

 more prominent than those of Smitt (fig. 91), who finds them 

 only in the more calcified cells. Avicularian opening round 

 or slightly oval. No ooecia present. 



One colony occurred on frond of Flustra carhasea^ Ell. & 

 Sol., the others on a univalve shell, &c. 



Mr. Hincks {Ann. & Mag. Nat. Hist. [5] vi. p. 274) refers 

 this species to ^^ ScMzoporella plana^ Dawson ; " but I am un- 

 able at present to find the description alluded to. 



ScMzojiOTella cruenta^ Norman. 

 (PI. XXI. fig. 4.) 



Lep'olia violacea, y&x. crnenta, Busk, Cat. Mus. Brit. ii. p. G9, pi. ex. 



Lepraha cruenta, Norman, Ann. & Mag. Nat. Hist. (3) xiii, p. 88. 

 Schizoporella cruenta, Hincks, Hist. Brit. Mar. Pol. p. 270, pi. xxx. 

 fig. 5. 



Two dead colonies, and one very fine colony taken when 

 mostly alive; the latter measures 23 millim. by 19 raillim. 

 The differences of colour in the different parts of the latter 

 specimen are striking. In the centre, which had died before 

 the specimen was taken, it is dirty white ; immediately out- 

 side is a zone of cells of a pink colour (not deep red) ; the 

 margin is formed by a broadish band of cells of a bright 

 brown colour, shading into pink towards the centre. The 

 different forms of the zocecium correspond well with those 

 given in Hincks's figure (?. c.) ; but the oral sinus is well 

 marked in most, even old cells. The surface thickenings 

 represented in Busk's figure do not occur to any thing like 

 the extent there given ; but in the older cells the margin of 

 the mouth is thick and prominent, and between some of the 

 cells occur very prominent boundary-lines. Ooecia^ early 

 stages of which resemble those cells in Busk's figure which 

 have a semicircular supraoral thickening, occur in abundance, 

 showing all stages of transition, from the large open hood 

 with slightly projecting rim to the perfect form, which is slightly 

 elevated, circular, subglobose, minutely punctate, and some- 

 what uneven ; they are inconspicuous and readily overlooked. 

 Traces of the original wide space in the front of the hood are 

 frequently left in the form of a pointed slit in its lower edge, 



