276 Eev. T. Hincks's Contrilmtions toimrds a 



AslyJospongia^ F. Eomer. Silurian. 

 Falceomanon^ F. Homer. Silurian. 

 FrotachiJleum^ Zitt. Silurian. 

 'i Eospongia^ Billings. 

 Melonella, Zitt. Upper Jura. 

 CyUndroj}hyma, Zitt. Upper Jura. 

 Mastosia, Zitt. Upj)er Jura and Neocomian. 

 VetuUna, O. Sclim. Eecent. 



XXXVI. — Contributions toioards a General History of the 

 Marine Polyzoa. By the Eev. Thomas Hincks, B.A., 

 F.E.S. 



[Coutiimed from vol. xiii. p. 309.] 

 [Plates VIII. & IX.] 



XIII. POLYZOA FEOM YICTOEIA {continued). 



Family Cellulariids. 



jVIenipea, Lamouroux. 



MeniiJea marginata. n. sp. (PI. IX. fig. 1.) 



Zoarium dicliotomously branched ; branches stout, of con- 

 siderable width, expanding upwards, with a marginal rib, 

 Ibimed of many tubes closely appressed to one another, which 

 are given off from the dorsal surface. Zocecia disposed in 

 5-7 longitudinal series, alternate, contracted above, expanded 

 below ; front wall wholly membranous (no calcareous expan- 

 fcicn), margin thin, on the outer edge above three or four tall 

 and stout spines, on the inner two j an operculum springing 

 from the inner side, a short distance below the top of the cell, 

 ex] anded above, bilobed, and deeply sinuated on the upper 

 maigin, placed edgeways ; at the bottom of each cell, on one 

 side or both, a small avicidarium witli triangular mandible ; 

 the marginal cells larger than the rest and bearing gigantic 

 spines, which form a conspicuous line along the edge of the 

 zoarium (PI. IX. fig. 1 h) ; below each of these cells a distinct 

 area, on which is placed a very large avicidarium resembling in 

 many points the articulated avicularium of Bugida^ but sessile 

 and fixed, the basal region well rounded, the mandibular portion 

 turned upwards, beak strongly imcinatc, mandible pointed. 

 Dorsal surface flat, the cells showing as fusiform areas ; be- 

 tween each pair of marginal zocecia a small rising from which 

 a chitinous tube originates, which unites with the marginal 



