Genera of the ISTorth American Palaeozoic Bryozoa. 449 



I In the nippocrepian forms there are no cilia except at the 

 mouth and upper part of the stomach, but in Paludicella and m 



Fio. 19 AlcyoneUa fungosa. a, Internal layer of oesophagus ; b, External layer of oesophagus ; 

 c, Internal la ver of rectum; rt, Hepatic layer of stomach; e, Pylorus; /.Cardia; g, External layer of 

 rectum; h, Medial layer of stomach; i, External layer of stomach; /, Polyp retractor muscle; 

 o. Radial muscles; p, Ovary; r, Superior radial muscles; s, Testis; t, Spermatozoa; u, Endocyst; 

 V, Ectocyat ; z, StatoblastsICaf ter Allmax) . 



