ON FOSSIL rOLYZOA. 



101 



)CiA, 



M. 



re. Ova 

 nd vibi*a- 

 rit. Mar. 



a ' Mono- 

 ra of tbo 

 species of 

 difficulty 

 with the 

 as seen in 

 67 •, and 

 Cams, or 

 (^0/7. cit. p. 

 ees ' with 

 jstomatous 

 t thoy are 

 in some 



edge goes 

 iiig a full 

 ise to pass 

 especially 

 ith as full 

 ny disposal 



1879. 



Genus Aetea, Lamonroux. 



1812. Aetm, Lamx , Busk, Smith. 1812. Anguinaria, Lamk (with- 

 out character), Johnston. 1815. Falcaria yS, Oken. Cercaripora (for 

 Aetea truncala, ^'c), Fischer. 



Generic character. Znnria calcareous, tubular, erect, with a raem- 

 branous area on one side ; distributed along a more or less adherent, 

 creeping fibre, dilated at intervals ; orifice terminal. Ooccla none. 

 Hincks (op. cit. p. 3). 



Mr. A. W. Waters (' Bryozna Nap.' op. cit. 1879, p. 1 15) says : ' I have 

 noticed in the Brit. Mns. Collection that the Ai'tehhv, dissolved the shells 

 on which they grew, and thus a permanent record is left. It is known 

 that several J3ryozoa have this power ; and the idea suggests itself that 

 some of the phenomena mentioned by Fischer ' are of tbis kind, and it 

 may not be useless to point out that in many cases it is impossible to 

 distinguish fossil Aetea from Hippothoa.' I am glad to give currency to 

 these hints, because in the Palajozoic rocks of Cincinnati there is a 

 species described by E. O. Ulrich, which he named liopalonaria venosa, 

 Ulrich, which the author describes as being related to Ilippothna (which 

 I question) 'but in the form and arrangement of the cells they differ 

 widely ' (' Cin. Soc. Nat. Hist. Ap.' 187*J;. I have in my possession a 

 specimen of this species iuerusting the Coral Strcptelasma corniculum, 

 Hall, and wherever the cells are broken the former existence of the 

 fossil may be traced by the method of ' dissolving ' referred to by 

 Mr. Waters. Two species of Aetea are recorded by Manzoni: — 



1. Aetea kkcta, Hincks='r' Ji5. sica, Couch: ^lanzoni == Hippothoa 



sica, Couch? (See Hincks's note, p. 7, 'Brit. Mar. Pol.') = 

 Stonmtopora gnJIica, D'Orb., 'Pal. Fran^*. Terr, Cret.' v. 836= 

 A. sica, Norman, ' (^uart. Jour, Micr, Soc' n. s. viii, 216= 

 A. niKjiiiiia, B, forma rrrta, Smitt (see ref. in Hincks) =^l, sica, 

 Couch, JIanzoiii, ' Castrocaro,' p. 6, pi. vii. fig. 69, '■^ 



2. Aetea ant.uixa, Ilincks (Busk, Heller, Smith, Norman), A. an- 



gnina, Hincks. (^lanzoni, ' Castrocaro,' p, 6, pi. vii., pi. vi. 

 ■fig. 70.) 

 Both these species are described as ' frequent by Manzoni at Castro- 

 caro, and also Jiving. 



A long list of synonyms of this species is given by Hincks, * Brit. 

 Mar. Pol,' p. 4. 



Family IT. Eucratiid.tc, Hincks. 



Tliisfamilj-embraces the genera Eucrafea, Lamx.: Cemellaria, Savigny; 

 Scruparia, Hincks; Iliifleya, Dystcr, and Brdlia, Dyster, and the whole 

 of the Family Gi;MKr,LAiun.i':, Busk, except the anomalous genus Notamia 

 {Dimetopia and Calwellia). Dic^ymia is distinguished by a different 

 type of cell. 



Genx^s Fuoratea, Lamx., 1812. 



1812. Eucratea, Lamx., Johnston, Smitt. 1813. Scruparia, Oken, 

 Busk ; Sertnlaria, (pt.) Linn. ; CeUnhiria, (pt.) Pallas ; CeUaria, (pt.) Ellis 

 and Sol. 1830. Unicellaria, (pt.) Blainv. 1850. Catenaria, (pt.) D'Orb. 



' Iftipopliorrlla cTpahta, ' Kin T'oitr. zur Kenntn. dor munrendcn IVyozoen, 

 von Ehiers, Kon. Oesellscli. <1. Wissensch. (Idttingen, 18G7. 



* Alecto 2»ira*itn, Hellor : Manzoni in Index to Tlntcs, p, 63, 'Castrocaro.' 



