NORTH A.MKIMCAN l-.AKLY TKKTIARY J5RYOZOA. 



163 



Genus RAMPHONOTUS Norman, 1894. 



IS'.M. l{tiiiii>tiiitii* XOUMAN. A Mnnili mi the Trnmlh.iein Fjord. Annals iinil Magaziu.- 

 Natural History. SIT. (!, vol. ];!. \ r . 122. 



The zooecia, if developed freely in form, are pyriform, widening upward 

 from the base, with a calcareous portion posterior to and occupying a larger part 

 of the front wall than that of the membranous portion; the membranous portion 

 of the area is nearly as wide as long and often somewhat trifoliate in shape; tin- 

 mouth opening is simple and. as usual, close to its anterior margin: the border 

 -in-rounding the membranous are- is calcareous. There may be lateral spines. 

 Ovicells large, globose, and iinperfonite* hyperstomial, and never closed by the 

 operculum. An acute bird's- 

 beaklike avicularium mounted 

 on a pedicel, with acute man- 

 dible of large size (often mon- 

 strously so), would seem to be 

 habitually developed on the 

 adult zooecium situated on the 

 central portion of the zooecium 

 on or immediately behind the 

 hinder margin of the area. 

 Dietellae: two pairs of lateral 

 and one distal the former 

 very narrow and rarely ex- 

 tending beyond the side walls ; 

 the latter small and appar- 

 ently sometimes not present. 

 (Xonuan, 1903.) 

 G e n.o type . Ramphonotus 



Busk, 1860. 



C. Senonian-Recent ^ IG - *** Genus Jiamphonotus Norman, 



Ill this o-enus the cryptocvst A~I'- Ramphonotus mina.r Busk, 18(50. A. Ovi celled zooecia. 

 is more reduced than An, X 5 " B ' Zooecia showing avicularium with mandible, X 25. 



' "" Aft,-, Hincks, 1SSO.) C. Mandible, X 85. (After Xurdeaard. 

 pMblettnmGny,lB4&;tiasK 1S 05.) D. Dietellae. (After Norman, 1903.) 

 are even species which are 



without this structure. The presence uf the pedicellar avicularia near tlie prox- 

 imal liorder of the opesium is in reality the only characteristic of the genus. 

 The species, in addition to the genotype, which may be classed in 



are: 



RatmpTionotus 

 Ramphonotii& 

 Ramphonotus (Membranipora) 

 Senonian. 



U,nii /iltoiKifi/x i . 



Canu. 1911, Kocanean. 



<////>fin/ forma monostacJiys llennig. 1892 



Pourtales. 1870. 



