﻿part 4] PHILLIPS AfiTR.fi A HENXAHI, AND QRIONASTR.IiA. 299 



Internal Characters. (PI. XXIII, figs. 2 & 5 ; 

 PI. XXIV, fig. 1.) 



Transverse section. — The septa are confluent; the inequality 

 "between the minor and the greater number of the major septa is 

 not marked, since only a few of the latter advance far into the 

 intrathecal region ; but these longer major septa may extend to 

 the columella. The counter- septum is prolonged into the centre 

 of the eorallite, and there dilates to form a conspicuous columella: 

 the swollen axial portion often becomes isolated from the rest of 

 the septum in the ephebic stage. (Many of these features are 

 displayed equally well in the calices as in section.) 



The number of septa present ranges from 30 to 40 in all, 15 to 

 20 in each cycle, and the thecse, although varying in size, measure 

 on the average 2 5 mm. in diameter. 



Longitudinal section. — The tabulae are conical in form, 

 the columella is persistent, and the dissepiments are fine. The 

 absence of the epithecal boundary to the corallites, and perhaps 

 to a small extent the less uniform disposition of the tabulae, 

 distinguishes the species from those of Lithostrotion. 



The foregoing description applies only to more typical examples. 

 The characters enumerated are subject to much variation : a less 

 well-developed axis leads to convergence with O. placenta, and less 

 perfect confluence on the part of the septa merges the members of 

 this species with those of O. ensifer. 



Notes upon the Type-Specimens of Sarcin ula p liillipsi 

 McCoy (genotype) and 8. tuberosa McCoy in the 

 Sedgwick Museum, Cambridge. 



1. Sabctnula phillipsi: Specimens 213 a & 213 i; from Corwen, 

 Merionethshire. (PI. XXIII, figs. 1-3.) 



The species was described, but not figured, by McCoy. There 

 are two syntypes mounted on the same tablet, and of these 

 I have chosen the first (213 a, PL XXIII, fig. 1) as the lectotype. 

 Photographs of both specimens are reproduced in PI. XXIII, 

 which illustrate sufficiently well the external characters to obviate 

 the necessity of detailed description. The two types of calices 

 present in the specimens shoulc be observed, namely, those in 

 which the theca is marked by a raised border (fig. 1) and those 

 in which the extrathecal region simply rounds off at the intra- 

 thecal depression (fig. 3, and certain calices in fig. 1). In the 

 ■case of 213 5 (fig. 3) the intrathecal depressions are filled with 

 matrix. The internal characters of the lectotype agree with the 

 general description, and need not here be repeated. The number 

 of septa present ranges from 32 to 40. 



