ORDER II 



CYCLOSTOMATA 



319 



Stomatopora Bronn {Alecto Lamx. non Leach) (Fig. 438). Zoaria delicate, adnate, 

 dicliotomously brancliing. Zooccia sub-tubular or elongate-ovate, arranged in a single 



Fio. 438. 



Stomatopora dichotoma (Lamx.). 

 GreatOolite; Ranville, Calvados. 

 A, Zoarium, i/i. B, same, en- 

 larged. 



Fig. 439. 



A, Corynotrypa delicatula (James). Utica Group ; Ciiicinnati, Ohio. 

 Zooecia, lö/i. B, C. inflata (Hall). Lorraine Group ; Cincinnati, ö/j. 

 C, Prohoscina frondosa Nich. Lorraine Group ; Cincinnati, Ohio. Portion 

 of a large zoarium, i2/j (after Ulrich). 



series ; apertures siib-terminal, iisually smaller than the width of the cell. Ordovician, 

 Jura, Cretaceous, Tertiary and Recent. 



Corynotrypa Bassler {ßtomatopora in part, auct.) (Fig. 439, A, B). Zoarium 

 unilinear, adnate, witb short to elongate, clavate zooecia. Ordovician to Devonian. 



Prohoscina Audouin (Fig. 439, C). Like Stomatopora but zocecia arranged in two 

 or more series. Ordovician, Mesozoic to iRecent. 



Berenicea Lamx, {Diastopora Busk, non Lamx.) (Fig. 440). Zoaria forming tbin, 

 discoid, flabellate or irregulär crusts upon foreign bodies. Zooecia arranged in 

 irregularly alternating lines. Rare in Ordovician and Silurian, very abundant in 

 Jura and Cretaceous, less frequent in Tertiary and Recent, 



Berenicea diluviana Lamx. Great Oolite ; 

 Ranville, Calvados. A, Young expansiou, 

 Vi. B, same, enlarged (after Haime). 



Fig. 441, 



Diastopora foUticea (Lamx.). Great Oolite ; 

 Ranville, Calvados. A, Fragment of zoarium, 

 Vi- B, Enlarged portion of same. 



Discosparsa d'Orb. Differs from Berenicea in having obconical or cup-shaped 

 zoaria, attaclied by centre of the base only. Cretaceous and Tertiary. 



Filisparsa d'Orb. Zoarium ramose, brancbes compressed dorso-frontally; apertures 

 irregularly disposed, Cretaceous to Recent. 



Diastopora Lamx. {Mesenteripora Blv.) (Fig. 441). Like Berenicea^ except that 

 the zoarium rises into broad, simple or convoluted leaves, composed of two layers of 



