182 CRIBRILINID.E. 



HABITAT. Very small stones in deep water. Mr. Nor- 

 man says : " This very distinct little species has a very 

 peculiar habit ; it is never found on any but the smallest 

 stones. I do not remember to have ever seen it on a 

 pebble larger than the little-finger nail ; more generally 

 it selects those that are not more than a fourth of that 

 size." 



LOCALITY. Shetland (Barlee) : ibid., in 80-110 fathoms 



(A.M.N.). 



GEOGRAPHICAL DISTRIBUTION. Bergen (A. M. N.). 



In this species the vibracula seem to be always present, 

 alternating regularly with the zooecia throughout the 

 colony. They reveal very clearly their homological nature, 

 as modifications of the ordinary cell. The vibracular cell 

 is in many respects a copy in miniature of the zocecium, 

 presenting the raised margin, the lamina, and the equiva- 

 lent of the orifice, the setiform appendage taking the place 

 of the oral valve. 



Family X. Cribnlnmhi 



ESCIIABID.E (part.), Johnston. 

 MKMHKANIPOKIP.K (part.), Buak. 

 EsciiARiPOKin.t: (part.), Sinitt. 

 EsciiARELLiDvE (part.), D'Orbigny. 



ZOARIUM adnate, forming an indefinite crust, or erect. 

 ZOOJCIA having the front wall more or less fissured, or 

 traversed by radiating furrows. 



THE Cribrilinida form a section of the large and mix i I 

 lancous assemblage of forms included in the genus 



