168 APSENDESIA. 



Diagnosis. The branches of the zoarium each contain about 30 

 zococia. The branches are marked externally by longitudinal ridges. 

 The branching is irregular. 



Distribution. Great Oolite : Hampton, near Bath. 



Affinities. This species is not represented in the British 

 Museum, and the only known specimen is in the Walton Collec- 

 tion at Cambridge. Fragments of Apsendesia might be mistaken 

 for it, but Haime's figure 4a seems sufficient to show that the 

 specimen on which he founded the species is a true Fasciculipora, 

 and not a broken fragment of Apsendesia. 



APSENDESIA, 1 Lamouroux, 1821. 

 [Lamouroux, Expos. Meth. p. 81. The name is spelt Apseudesia by some authors.] 



SYNONYMY : 

 Pelagia, Lamouroux. 

 Def randa, pars, Broun. 

 Discotubigera, D'Orbigny. 



Diagnosis. Fascigeridae in which the zoarium rises from a cup- 

 shaped disc. The bundles of zocecia in the adult are long, and are 

 grouped into long, irregularly sinuous series. There are no platforms. 

 The zooscia all open upon the summits of the ridges, and never upon 

 their sides. The under side of the zoarium is covered by an epitheca. 



Type species. A. cristata, Lamouroux. 



Affinities. This genus differs from Fasciculipora, D'Orb., by the 

 branches being densely crowded, so that the zoarium is massive ; 

 the groups of apertures occur in long, irregular series, and not 

 completely isolated. It differs from Fascicularia, M. Edw., by 

 the absence of platforms or lateral anastomoses, so that the zoarium 

 is open. The fact that the zocecia all open on the surface of the 

 zoarium, separates it from Cyrtopora, D'Orb., and its allies. 



1 The spelling of this name is accepted as Lamouroux wrote it. Blainville, 

 Agassiz, Bronn, and Romer have corrected it to Apseudesia, regarding the 

 original spelling as only a misprint. Bronn and Romer, however, admit (Leth. 

 Geogn. 1851, ed. 3, Bd. ii. p. 94) that though this alteration gives the word 

 a possible etymology, it does not give it a meaning when applied to this genus. 

 It seems therefore advisable to accept Apsendesia as a senseless name. 



