22 MR. A. W. WATERS ON THE MARINE 



In Lepralia peristomata the peristome entirely surrounds tbe aperture, 

 whereas in Lepralia crassimarginata, Hincks, afterwards described by Jullien 

 as L. collaris, there is only an elevation a short distance below the proximal 

 edge of the aperture. There is, however, in L. peristomata a great range in 

 the development of the peristome, as some zooeeia show hardly any, whereas 

 in others it is much raised. 



Loc. Madeira (Busk, Waters, Norman), 15-70 fatb. ; St. Vincent 

 Harbour, Cape Verde Islands, 10 fath., collected by Grossland. 



SCHIZOTHECA FISSA (Busk), Hincks. 



Lepralia fissa, Busk, Q. Journ. Micr. Sc. vol. iv. (1856) p. 308, pi. 9. figs. 8-10; Waters, 

 Ami. Mag. Nat. Hist. ser. 5, vol. iii. (1879) p. 43, pi. 11. lig. 6. 



ScMzotheca fissa, Hincks, Brit. Mar. Polyzoa, p. 284, pi. 41. figs. 1-3 (1880) ; Ann. 

 Mag. Nat. Hist. ser. 5, vol. xix. (1887) p. 303; Neviani, "13ri. post plioc. di Spilinga," 

 Atti d. Accad. Gioen. di Sc. Nat. in Catania, vol. ix. (1896) p. 34, fig. 17 ; " Bri. delle Form 

 Plioc. e PostpL," Bull. Soc. Geo! Ital. vol. xvii. (1898) p. 12 ; " Bri. neog. della Calabria," 

 Pal. Ital. vol. vi. (1900) p. 202, pi. 18. figs. 4, 5 ; Calvet, " Bry. du Corse," Trav. de l'lnst. de 

 Zool. de FUniv. de Montpellier, ser. 2, Mem. 12, p. 25 (1902) ; Exp. Sc. du ' Travailleur ' et du 

 ' Talisman,' Bryozoaires, vol. viii. (1907) p. 429; Levinsen, Morph. & Syst. Studies on the 

 Cheil. Bry. p. 294 (1909). 



There are only one or two small pieces, and in these a number of the 

 earliest or disk stages of tbe ovicell occurs, but very few completed ones ; in 

 these tbe " fissure " is not as large as in my British and Mediterranean 

 specimens, but the median portion is thin. Levinsen does not deal, in 

 extenso, with the genus, merely putting it in the family Keteporidse. This 

 has long seemed to be right, as the open ovicell is similar to those of tbe 

 group of Reteporce with the wide fissure as in R. Imperati, Busk *. The 

 labial fissure or pore is also very well marked, and this, as I have said, is an 

 important character of the genus. 



Loc. Guernsey; Sidmouth; Plymouth; Cornwall, 30-40 fatb. ; Ireland; 

 Naples; Capri; Adriatic; Corsica, St. Bonifacio, 55-77 met. (Calvet 

 and M. Edio.), Bastia, 40-60 met. (Calvet), Bay of Cadiz, 717 met. (Calvet); 

 St. Vincent Harbour, Cape Verde Islands, 10 fath., collected by Crossland. 



Holoporella pusilla (Smitt), Waters. (Plate 2. figs. 7-9.) 



Dismpora albirostris, forma pusilla, Smitt, Floridan Bry. p. 70, pi. 12. tig. 233 (1873). 



Cellepora se.vspinosa, Waters, "Bry. from Madeira," Journ. R. Micr. Soc. 1899, pi. 3. 

 fig. 12; Norman, "Poly, of Madeira," Journ. Linn. Soc, Zool. vol. xxx. (1909) p. 311. 



Lepralia Watersi, Calvet, Exped. Sc. du 'Travailleur' et du 'Talisman,' Bryozoaires, 

 vol. viii. (1907) p. 412, pi. 27. tig. 11. 



The younger zocecia, near the border, show six long spines, whereas the 

 older ones have only one at each side. Tbe ovicell is small, raised, and 



* Waters, " Med. & N. Zeal. Reteporidaj," Journ. Linn. Soc, Zool. vol. xxv. (1894) 

 p. 256. 



