CHILOSTOMATA 



285 



Family 3. G-emellariidae. Busk. 



Z'xiriuni *tth-,-lciir'ii*, .flexible, continuous. Zocecia somewhat obconical, opposite, 



In y //Yx, inmnnnl. KYrriit. 



Gemellaria, Savigny ; Scruparia, Hincks ; Notamia, Fleming. 



Family 4. Cellariidae. Hincks (Salicornariadae, Busk) 



Zoarium erect, *iil>-<-iili',iilri<-nl, < I ichotomously branching, usually 

 jointed. Zocecia rhomboidal or hexagonal, each corresponding to an 

 area, and disposed in series about an imaginary axis ; front depressed, 

 usually concave. Orifice crescentic or semi-circular, situated slightly 

 above the centre of the cell. Ocecia inconspicuous, opening at or near 

 the summit of the area above the orifice. Avicularia usually present. 

 Cretaceous to Recent. 



Cellaria, Lam. (Salicornaria, Cuv. ; Salicornia, Schweigg), (Fig. 

 472). Zoarium jointed, the segments sub-cylindrical and connected by 

 flexible, horny tubes. Zooecia immersed, surrounded by a raised 



border disposed in quincunx. Avicularia irregularly distributed, Goidf.sp. oiigocene; 



.11. Kaufungen, near 



situated above a cell, or occupying the place ot one. Cassei. Enlarged 



FIG. 472. 

 Cellaria rhombifera, 



(after Reuss). 



Family 5. Selenariidae. Busk. 



Zoaria circular or irregular in outline, the celluliferous side convex, the lower concave or 

 fiat, probably free in the mature condition. Upper surface areolated, the zocscia immersed, 



KM;. 473. 



I.nniii;tfs HoliJfits*;, Ha^w. Upper Cretaceous, Liineburg. a-c, Zoarium of the natural size; d, Upper sur- 

 face, enlarged ; <-, LMWIT surface, enlarged. 



their borders elevated. Orifice rounded or semi-elliptical, situated more or less in advance 

 of the depressed front. Small vibracular cells usually present. Cretaceous to Recent. 



Lunulites, Lamx. (Fig. 473). Zocecia arranged in series radiating from the centre 

 and bifurcating as they advance toward the border. Vibracular cells usually elongate, 

 lying in linear series between the rows of zocecia. Very abundant in the Upper 

 Cretaceous and Tertiary ; also Recent. 



SticJiopora, Hagw. emend. Busk. Vibracular cells wanting. Zocecia equal, hexa- 

 gonal, not arranged in radiating series. Cretaceous. 



Selenaria, Busk. Cretaceous to Recent. 



