RHYNCHOPOUA BISPINOSA. 385 



Genus RHYNCHOPORA, Hincks. 



Der. From pvyxos, a beak, and Tropos. 



Lei'RALIA (part.), auctt. 

 DiscoPORA (part), Gray. 



Generic Character. — Zocecia with the jjrimanj orifice 

 transversely elliptical, lower margin slightly sinuated ; 

 secondary orifice suborbicular , with a niucro on the lower 

 margin and an uncinate p?'ocess immediately above it, with- 

 in the mouth. Zoarium {in the British species') incrusting. 



This form is a difficulty in the way of the systematist. 

 Its most strongly marked characters — the mucronate lip 

 and the curious uncinate process within the orifice — con- 

 nect it with the present group ; but the lower margin of 

 the primary opening is undoubtedly furnished with a sin vis 

 — a point in which it agrees with the Myriozoidce. It 

 must be regarded as one of those transition forms which 

 are continually reminding us how little the real order of 

 nature can be represented by a rigorous and unbending 

 system. I had placed it here^ the existence of the sinus 

 having escaped my observation ; but I now think that it 

 should rank as a Myriozoidan form having strong affinities 

 with the present family. 



Rhynchopora BISPINOSA, Johustou. 

 Plate XL. figs. 1-5. 



■*&■= 



Lepralia BISPINOSA, Johist. B. Z. ed. 2, 326, pi. Ivii. fig. 10(very indiSereut) : 

 Busk, B.M. Cat. ii. 77, pi. Ixxx. figs. 1-4 : Hincks, Devon & 

 Comw. Cat., Ann. N. H. ser. 3, ix. 205 (45 sep.). 



Discopora BISPINOSA, Gray, B.M. Rad. 126. 



Zoo'cia ovate, depressed below, rising towards the mouth, 



2c 



