BRYOZOA FROiE XEW ZEALAND. 



51 



therefore requires grt. t care. In S. magnilabris the shelf at the 

 upper part of the opercular opening is much wider than in S. neo- 

 zelanica, in which it is usually quite rudimentary; the lip is also 

 wider and much raised, forming a support for the base of the oper- 

 culum. The tubular passage is also more distinct in S. magnilabris. 

 None of these characters are very satisfactory, as they are all sub- 

 ject to more or less variation. The fossils from Curdies Creek, 

 Mount Gambier, Bairnsdale, Batesford, and Murray Cliffs (Aus- 

 tralia) all show the magnilabris characters; but a further exami- 

 nation of the Waipukurau and Petane fossils shows that they are 

 neozelanica in the Lepralia-st&ge. 



Loc. Living : New Zealand. Fossil : Waipukurau, Petane, and 

 Napier (New Zealand). 



20. Micropora lepida, Hincks. 



Monoporella lepida, Hincks, Ann. & Mag. Nat. Hist. ser. 5, vol. viii. 

 p. 59, pi. ii. fig. 2. 



The fossil from Napier, New Zealand, corresponds in size with a 

 recent specimen from New Zealand. The oral aperture in both is 

 0-1-0-12 mm. 



Loc. Fossil: Napier. Living: Curtis Island (H.) ; New Zealand 

 (K C. J.). 



21. Micropora yaripereorata, sp. nov. (PI. Till. fig. 27.) 



This species has caused me great difficult}-, as there are appar- 

 ently two Australian and New-Zealand species, or varieties, most 

 closely allied, and on none of the characters alone could the separa- 

 tion be made* The first of these two is slightly the larger, but 

 has a narrower operculum (0-12 mm.), relatively longer from the 

 proximal to the distal edge, with lateral hinges as in Mernbranvpora, 

 and the whole surface is similar in texture ; there are two lateral 

 spines. The ovicell is large and not much raised, and the oral 

 apeiture of the ovicelligerous zocecia is larger than that of the non- 

 fertile omes. On each side a little below the orifice there is a large 

 circular perforation, and in some specimens many zocecia have a few 

 supplementary pores, usually smaller, round the edge of the cell ; the 

 aviculari um is smaller than in the following form, and the mandible 

 has a sm all central opening. 



This is Mtmbranipora stenostoma, Busk (Cat. Mar. Polyzoa, p. 60, 

 pi. c. fig. 1), but the insufficient description has made it impossible 

 to be sur,e what was meant, and therefore the name must be dropped 

 as it has since been more fully described as M. perforata, MacG. 

 The aperture of the ovicelligerous zocecium is figured by Busk larger 

 than tha t of the other zocecia ; but no difference in size is mentioned ; 

 his figure has been drawn from a specimen covered with an in- 

 tegument, and the large openings on each side have been over- 

 looked, although they are very distinct in the Museum slide. 



The second form, which 1 now separate with some doubt and 

 call vari perforata, on the other hand, has an operculum 0-14 mm. 

 wide, with the upper half the thickest and the lower composed of 



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