BRYOZOA FROM ZANZIBAR. 517 



surface is closely pitted, and at each side of the oral apei'ture, 

 somewhat below it, there is a large subtriangular chamber which 

 is probably avicularian. In the band surrounding the oral 

 aperture there is an opening at the proximal end which appears 

 to be avicularian. 



Text-fiff. 81. 







Lepralia wasinensis, sp. n. X 25. 



The species seems most nearly related to Lepralia (Mucronella) 

 pnelucida Hincks, which has a Jarge avicvilarium by the side of 

 the oral aperture as seen in my specimens, and as Professor R. 

 Osburn * mentions in Ms specimens from Labrador. 



Loc. Wasin, Brit. East Africa, 20 fath. (520), collected by 

 Crossland. 



Lepralia cleidostoma, var. inermis Ortmann. 



Lepralia cleidostoma, var. inermis Ortmann, " Die Japanische 

 Bry.," Archiv fiir Naturgesch. vol. i. p. 49 (1890), 



Lepralia cleidostoma, var., Hincks, Ann. Mag. Nat. Hist. ser. 5, 

 vol. xiii. p. (41) (1884). 



This form has the surface smooth a,nd silvery with fi^equently 

 an umho below tlie aperture and often one on the ovicell. The 

 ovicell is scarcely at all raised and is also smooth and imperforate, 

 and has a small semilunate area. There is sometimes a small 

 knob on each side of the apertui^e. Both the aperture and the 

 operculum are about the same size and form as that of L. cleido- 

 stoma Smitt from Madeira t, which also occurs at Florida (Sm.), 

 Japan {Ort.), and Bermuda {my coll.) ; but L. inermis var. differs 

 in having no avicularia, and it is a question whether it is advisable 

 to consider it a species or a variety, 



Norman says + that L. cleidostoma is the L. porcellana Busk, but 



* " Bi'j'ozoa from Labvadoi', etc.," Proc. U.S. Nat, Mus. vol. xliii. p. 283, 

 pi. xxxiv. figs. 3, 3 a, 3 c (1912). 



+ Waters, "Brj^ozoa from Madeira," Journ. R. Micr. Soc. 1899, p. 10, pi. iii. 

 %. 16. 



X " Polyzoa of Madeii-a," Journ. Linn. Soc, Zool. vol. xxx. p. 305, pi. xl. figs. 1, 2 

 (1909). 



35* 



