292 CANON A. M. NORMAN ON THE POLYZOA 



1899. Cribrilina setosa, Waters, ''Bryozoa from Madeira," Journ. Roy. Micr. Soc. p. 8. 



1902. Cribrilina radiata, Plarmer, Quart. Jour. Micr. Sci. n. s. vol. xlvi. p. 326, pi. 15. 



%.7. 



1903, Cribrilina innominata, Norman, Ann. & Mag. Nat. Plist. ser. 7, vol. xii. p. 96, 



pi. 9. fig-. 3. 



In this species the ribs are usually 10-12 in number, but sometimes fewer ; 

 they are almost always more prominent than in the last species, and are 

 frequently greatly raised and often crowned with spines. This elevation of 

 the ribs much obscures the sight of the intercostal lacunes. The large inter- 

 zooecial oblique and very acute avicularia of C. radiata are absent, but 

 rarely here and there avicularia are found of the same general characters 

 as those just mentioned but not so produced and acute. On each side just 

 below the oral opening is a slender forward projecting slender papilla or seta 

 which is very easily abraded. The suboral pore or its substitute presents 

 just the same variations as in the last species. The foregoing observations 

 apply to the forms of C. innominata found on the British coasts. At Madeira 

 I found this species between tide-marks at Gorgulho with the ribs very 

 slightly elevated, and consequently the interstitial openings (lacunes) are 

 conspicuous ; suborally several minute pores are present ; no interzooecial 

 avicularia were observed. 



Cribrilina punctata (Hassall). H. 

 Recorded by Hincks. 



Cribrilina Balzaci {Audouin). W. 



1826. Ilustra Balzaci, Audouin, Saviguy's Egypte, j)l. 9. fig. 8. 



1879. Lepralia crib?'osa, Waters (nee Heller), " Bryozoa Bay of Naples," Ann. & Mag. 



Nat. Hist. ser. 5, vol. iii. p. 36, pi. 9. fig. 4. 

 1899. Cribrilina Balzaci, Waters, "Bryozoa from Madeira," Jour. Roy. Micros. Soc. 



p. 9, pi. 3. figs. 31, 32. 

 1903. Cribrilina Balzaci, Norman, " Nat. Hist. East Finmark," Ann. & Mag. Nat. Hist. 



ser. 7, vol. xii. p. 98, pi. 9. fig. 6. 



The mouth-spines are four ; the lip is strongly pouting, as in C. punctata. 

 There are usually no lateral avicularia, but sometimes they are present on 

 one or both sides. The ooecium bears concentric lines, and is sparingly 

 punctured ; there is sometimes an avicularium above it ; but whole zoaria 

 may be totally devoid of this apically placed organ. 



Common on stones between tide-marks ; less frequently on shell. 



Cellularia fistulosa [Linne). 



Two or three small fragments in deep water, apparently drifted 

 there. 



In Knvi. & Mag. Nat. Hist. ser. 7, vol. xi. 1903, p. 577, I have shown the 

 necessity of restoring the original name of that most admirable naturalist, 



