IDMONEID^. 97 



6. H. HIPPOLYTA, Defrance, Diction, d. Sc. Nat., t. xxi, p. 4.3, pi. xlvi, fig. 2 ; Blainville, 



Man. d'Actin., p. 419, pi. Ixviii, fig. 3 ; Bronn., Leth. Geogn., p. 880, 

 pi. xxxvi, fig. 1 ; M. Edwards, I. c, p. 20, pi. xi, fig. 3. 

 H. HTPPOLYTUS, HiPPOLYTHUs, HiPPOLiTHUS, Michelin, Icon. Zoopb., p. 168, pi. xlvi, 



fig. 18 ; Eeuss, Foss. Polyp, d. W. Tert. B., p. 42, pi. vi, figs. 23, 24 ; 



Grignon. 



7. H. L^vis, M. Edwards, 1. c, p. 20, pi. xi, fig. 2 ; Miocene, Dap. 



8. H. ANDEGAVENSis, Micheliti, 1. c, p. 318, pi. Ixxvi, fig. 8. 



Of which I have been able, with tolerable but not absolute certainty, to identify with 

 Crag fossils — 



1 . H. KETEPOKACEA, M. Edwards, 



2. H. STRIATA, M. Edwards. 



3. H. AFFiNis, M. Edwards. 



4. H. ANDEGAVENSIS, Michelin. 



5. H. HIPPOLYTA, Defrance. 



§ 1. FENESTRATiE. 



Polyzoario retiformi, plus minusve foliaceo, e ramis in piano unico dispositis, perque 

 ramusculos breves transversos, crebros conjunctis composito. 



Branches in one plane, connected by transverse ramuscules, so as to form a fenestrated 

 frond. 



1. H. INFUNDIBULATA. PI. XIV, fig. 1. 



Polyzoario undulato, infundibuliformi ; ramis gracilibus, subcylindricis. Superficie 

 anteriori, porosa, fibrosa; posteriori sulcis longitudinalibus porosis ornata. Cellularum 

 orificiis orbicularibus, sparsis. 



Polyzoarium wavy, infundibuliform ; branches slender, subcylindrical ; mouths of cells 

 orbicular, exserted or level; intermediate surface on the front of the branches fibro- 

 punctate ; 'posterior longitudinally costate, with punctures along the sulci. 



Habitat.— C. Crag, S. Wood. 



The polyzoarium of this species forms tolerably regular infundibuliform growths, 

 attaining in the largest specimens observed about an inch in diameter. The posterior 

 surface is marked with parallel raised lines, between which the surface is concave, but 

 scarcely to be termed sulcate, and these spaces are furnished with rather distant, 

 elongated pores. 



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