HAPLOCECIA. 157 



? Spiropora bessinensis, Haime, 1854, op. cit. p. 198. 



,, bessina, E. E. Deslongchamps, 1857, Syst. ool. inf. 



Calvados : Butt. Soc. linn. Norm. t. ii. p. 328. 



Distribution. Bajocian : France. 



HAPLOCECIA, Gregory. 



Prom cnrkovs ' simple ' and OIKOS ' a house. 

 [Gregory, Rev. pt. v. : Ann. Mag. Nat. Hist. ser. 6, vol. xvii. p. 199.] 



SYNONYMY : 



Cricopora, pars, Morris, et auct. 

 Entalophora, pars, D'Orbigny, et auct. 

 Melicertites, pars, Romer, non Pergens. 

 Escharites, pars, Hageiiow. 



Diagnosis. Entalophoridae in whicn the zooscia are short, and 

 angular in form. The peristomes are never greatly raised; the 

 orifices are small ; and they are arranged either lineally or 

 quincuncially. 



Type species. Haplooecia straminea (Phillips), 1829. 



Affinities. The genus Melicertites was founded by Romer in 

 1840 for three species from the Cretaceous. Of these, the first 

 was the Ceriopora gracilis of Goldfuss, 1 a species founded on a 

 worn fragment, which is generically indeterminable. The species 

 has, however, been accepted, and again figured by Romer 2 and 

 Yon Hagenow. 3 According to the former it is a Cheilostomatous 

 form, closely allied with the typical species of his genus Escharites. 

 Hagenow, impressed by this resemblance, merged the two genera ; 

 but his figures (notably 15 / and 15^) show that his form is truly 

 Cyclostomatous, and is probably a Spiropora. The type species 

 must therefore be left quite uncertain, as the ultimate type is 

 indeterminable, Romer's being Cheilostomatous, and Hagenow's 

 being indistinguishable from Spiropora. 



Romer's two other species are of a very different character, and 

 both belong to the Entalophoridee with hexagonal zocecia and small 

 apertures. His 4 figures of his M. porosa, and the third species, 



1 Petref. Germ. p. 35, pi. x. fig. 11. 



2 Verst. norddeut. Kreidegeb. p. 18, pi. v. fig. 13. 



3 Bryoz. Maastr. Kreideb. 1851, p. 56, pi. i. figs. Iba-h. 



4 Romer. Op. cit. p. 18, pi. v. fig. 12. 



