26 THE VOYAGE OF H.M.S. CHALLENGER. 



Lepralia mucronata, Smitt. 



Hscharipora mucronata, Smitt, Floridan Bryozoa, p. 24, pi. v. figs. 113-115. 



Miicronella mucronata, Waters, Quart. Journ. Geol. Soc, vol. xxxvii. p. 328, pi. xvii. fig. 66 ; 



vol. xxxviii. pp. 266, 507 ; vol. xxxix. p. 436 ; vol. xli. p. 293 ; 



vol. xliii. p. 55. 

 Lepralia cellepor'oides. Busk, Zool. ChaU. Exp., part xxx. p. 142, pi. xvii. tig. 4. 



In Smitt's species three pores are described, whereas there is only one in the 

 Challenger specimens, but it is often trifoliate. I have pointed out that in the fossils 

 there are sometimes three pores, sometimes five ; and the avicularia is variable in size, 

 being in some fossils very rare, The Challenger specimens have sometimes a slight 

 mucro. The series should perhaps be divided into the varieties unipora, tripora, and 

 varipora, but it seems that the recent and the fossils from the various Australian and 

 New Zealand localities are all closely connected. 



Lepralia occlusa, Busk (PI. III. figs. 32-34). 



Escharoides occlusa, Busk, ZooL ChalL Exp., part xxx. p. 150, pi. xxi. fig. 8. 



This is one of those cases where the shape of the aperture is partly Schizoporellidan, 

 partly Lepralian. There is an avicularium at the side of the aperture, but I should 

 hardly consider that this forms a sinal orifice, the character on which the genus 

 Escharoides is based. The ovicell has an area on the front with large openings, the 

 rest is imperforate. The specimen examined was from ofi" Samboangan. 



Lepralia japonica. Busk. 



Lepralia japonica. Busk, Zool. Chall. Exp., part xxx. p. 143, pi. xvii. fig. 5. 



The ovicells are hardly at all raised above the surface of the zocecium, but are readily 

 distinguished, as the ovicell is perforated with numerous small pores, whereas the surface 

 of the zocecium has few large pores. 



The structure of the ovicell shows that I was wrong in supposing that this was my 

 Monoporella crassatina. 



Lepralia margaritifera, Quoy and Gaimard (PI. III. figs. 15, 16). 



Flustra margaritifera, Quoy and Gaimard, Voy. de TUranie, p. 606, pi. 92, figs. 7, 8. 

 Lepralia margaritifera. Busk, Brit Mus. Cat., p. 72, pi. ci. figs. 5, 6 ; Zool. ChaU. Exp., 



part xxx. p. 145; Jullien, Bryozoaires, Mission du Cap Horn, p. 58, 



pi. ix. fig. 1. 



This is the most interestmg species that I have met with in the Challenger 

 collection, on account of a very peculiar structure occurring in the avicularian chamber. 

 As I only brought away a small fragment with the intention of comparing the 

 " chitinous organs," the examination is not an exhaustive one. 



