BRYOZOA FROM NEW ZEALAND. 



57 



36. Mucronella ? alyareziana, d'Orb. (PI. VII. figs. 24, 25.) 



Escharina alvareziana, d'Orb. Voyage dans V Amerique, t. v. p. 14, 

 pi. vi. figs. 1, 4. 



Lepralia alata, Busk, Cat. Mar. Polyzoa, p. 71, pi. lxxix. fig. 3. 

 Mucronella alvarezi, Jullien, " Bry. Cheil." Bull. Soc. Zool. 1881, 

 p. 5. 



Two specimens from Waipukurau have subhexagonal zooecia, with 

 radiating grooves on the front and a very prominent umbo in the 

 centre, a small avicularium or vibraculum on each side about the 

 middle ; a row of large pores round the edge of the zocecium 

 situated between the grooves. Above the oral aperture 4-6 spines ^ 

 Oral aperture about O'l mm. wide, rounded on the distal edge, 

 nearly straight below, forming a semicircle ; the lower edge is 

 minutely serrated, with three small teeth in the centre ; on each 

 side of the aperture a denticle directed inwards. 



This differs from L. alata, as described by Busk, in the number 

 of spines, and his description leaves us in doubt as to the aperture ; 

 and merely from the fossil it is impossible to be quite sure as to the 

 genus. As Lepralia alata has never been returned to the British 

 Museum, I have been unable to make a direct comparison. 



Loc. Cape Horn, 40 fath. (B.) ; Peru {cVO.) ; Valparaiso (J.). 

 Fossil : Waipukurau, Trig's Station, and " Whakati." 



37. Mucronella tricuspis, Hincks. 



Mucronella tricuspis, Hincks, Ann. & Mag. Nat. Hist. ser. 5, 

 vol. viii. p. 66, pi. iii. fig. 1. 



Mucronella munita, MacGillivray, Trans. Hoy. Soc. Victoria, 

 vol. xix. p. 136, pi. ii. fig. 10. 



A specimen from Petane has a row of pores round the edge, and the 

 peristome rises less suddenly out of the zocecium than in my recent 

 specimen. There are lateral acute avicularia, the ovicell is recum- 

 bent, and the fossil most nearly corresponds with MacGillivray's 

 figure. 



Loc. Living : Curtis Island (H.) ; Port Phillip Heads and New 

 Zealand (MacG). Fossil : Petane. 



38. Mucronella tricuspis, Hincks, var. waipukurensis, nov, 

 (PL VIII. fig. 30.) 



There is a worn fossil from Waipukurau, which, upon comparison 

 with M. tricusp>is, Hincks, turns out to be of the same size, and cor- 

 responds with it in the screen-like elevation, in both cases enclosing 

 two tubes, as mentioned on page 59. In the" fossil, however, the 

 slender lateral mandibles are wanting ; but there have been small 

 and apparently nearly round avicularia near the base of the 

 zooecia. 



39. Mucronella porosa, Hincks, var. minima, nov. (PL VIII. 

 fig. 31.) 



A fossil from Petane has the upper part of the zooecium thickened 



