ANIMALS. 47 



Quarry, and Hylton North-Farm, in the Shelly Magnesian Limestone. In consequence 

 of Geinitz confounding it with the next Coral, it is difl&cult to make out its German 

 habitats from the ' Versteinerungen,' but it appears to be widely distributed in the 

 Thuringerwald. Schlotheim and Goldfuss mention its occurrence at Gliicksbrunn ; I 

 collected it myself at Schlossberg von Konitz, where it occurs rather plentifully. 



Genus Acanthocladia, King, 1849. 

 Ceratophytes (anceps), Schlotheim. 

 GoKGONiA (id.), Goldfuss. 

 Retepoka (pluma), Phillips. 

 Glauconome (bipinnata), Phillips. 

 Fenestella (anceps), Lonsdale. 



Biagnosis. — " A Thamniscidia. Stems symmetrically and bilaterally branched 

 more or less on one plane ; rarely bifurcating. Branches short, simple, occasionally 

 elongated, and becoming bilaterally branched. Stems and branches celluliferous on the 

 side overlooking the imaginary axis of the Coral. Cellules imbricated, and arranged 

 in longitudinal series. Series of cellules separated from each other by a dividing ridge. 

 (?) Gemmnliferous vesicles on the dividing ridges."^ 



Type, Ceratophytes anceps, Schlotheim. 



The Corals which it is proposed to place in this genus have often been included in 

 Goldfuss's Glauconome, which is typified by a tertiary-like Cellaria-salicornia fossil 

 {G. marginata, Miinster, ' Pet. Germ.,' p. 100, pi. xxxvi, fig. 5), undoubtedly belonging to 

 a genus previously established by Defrance, under the name of Vincularia. In this 

 case the name Glauconome becomes obsolete. This, together with the circumstance 

 that no genus is known to the writer as available for a number of species represented 

 by the Ceratophytes anceps, have induced him to institute the one under consideration. 

 Such species as Betepora pluma, Glauconome bipinnata, G. pulcherrima, G. grandis, and 

 several others, fall at once into the group, without- a doubt being raised of their 

 congenerism. 



Acanthocladia -is readily distinguished from Thamniscus by its symmetrical and 

 bilateral branching, its stems being rarely dichotomous, and the simple form of most 

 of its branches. In Acanthocladia branching rarely happens through the stems 

 bifurcating : it is due to the development of some of the bilateral offsets : whereas the 

 reverse obtains in Thamniscus, — the branching in this genus being due to the terminal 

 forking of the stems. Another important difference consists in the position and 

 character of the gemmuliferous structures. Assuming certain prominences observable 

 in Ceratophytes anceps to constitute these organs (but it is not of much importance 

 whether they do so or not, since their absence in C. dubius still constitutes a difference), 



• Annals and Magazine of Natural History, 2d series, vol. iii, p. 389, 1849. 



