ON FOSSIL POLTZOA. 125 



149. MastigophoraDutertrei, And. (Flustra ibid) =Lepr alia Woodiana 



Busk, ' Crag Poly. ' p. 42, pi. vii., figs. 1 and 3=Lepralia 

 aurita, Reuss, ' Bryoz. d. deutseb. Septarien.' p. 62=Lepralia 

 otophota, Manzoni, ' Castrocaro,' p. 23 (non L. olophora, Rss.). 

 Range. — Cor. Crag, Mitteloligociin (Rss.), Older Pliocene, Castrocaro. 

 Living. 



Genus Rhyxchopora, Hincks. 1 



No fossil species recorded. See Hincks, ' Brit. Mar. Poly.' p. 385. 



Genus Schizotheca, Hincks, p. 283. 

 No record of fossil species. 



Genus Hippothoa, Lamouroux. 



Catenicella, (part) Blainv. ; ? Terebripora, D'Orb. ; Mollia, (part) 

 Smitt. 



' Zocecia distant, caudate, connected with one another by a slender 

 prolongation of the lower extremity, so as to form linear series ; brancbes 

 given off from the sides of tbe cells ; orifice subterminal, suborbicular, 

 with the lower margin sinuated or produced. Zoarium adherent.' — 

 Hincks, p. 286. 



150. Hippothoa divaricata, Lamx=H". patagonica, Busk, ' Crag,' 

 p. 24, pi. i. fig. 5 ; H. longicaudia, Fischer=jff. patagonica, 

 Busk. 



Range. — Pliocene, Castrocaro, rare (Manzoni) ; Scotch Glacial ; 

 Palaeolithic ; var. patagonica, Cor. Crag ; Hippurite Limestone, St. 

 Gregoire (Michelin). 



151. Hippothoa expansa, Dawson (see Hincks for description, op. tit. 



p. 291). ' The species is distinguished from II. divaricata by its 

 large size.' — Hincks. 

 Range. — Post- Pliocene. Beaufort and Rivi6re-du-Loup, Canada 

 (Dawson). Living, Shetland. 



152. Hippothoa flagellum, Manzoni, ' Bryoz. Foss. Ital.' 4th Contrib. 



6, p. 1, f. 4. 

 Range. — Pliocene, Calabria ; Castrocaro (Manzoni). 



Family XY. Escharidje, (part) Smitt. 



This is by far the most important family group founded by the Rev. 

 Thomas Hincks in his work on the ' Brit. Marine Polyzoa,' and the 

 description of the genera and species occupies over 100 pages of the 

 work. So far as the different genera have been worked, the grouping 

 appears to be perfectly natural ; but at the same time, as our knowledge 

 increases of the foreign Recent as well as Fossil forms, some of the 

 genera might require modification. Under present circumstances it is 

 best to adopt the family as it is. 



' Zoarium calcareous, incrusting, or erect and lamellate, or ramose. 

 Zooccia without a membranous area, or raised margins: («) with a 

 simple primary aperture, horseshoe-shaped, or semielliptical, or subor- 

 bicular ; or (/3) with an elevated secondary orifice inclosing an avicu- 

 lariutn ; or (y) with a primary orifice having a dentate lower margin, 

 and a secondary orifice channelled in front or entire ; or (£), with the 



1 This genus is wrongly placed among the Escliaridcc. It belongs to the family 

 Myriozoidie. 



