378 PROF. S. H. REYNOLDS AND DR. A. VAT7GHAN ON [Aug. I9I I, 



alone. A third of the septal ring is composed of a group of 

 straight, longer septa which do not meet one another ; the remain- 

 ing two-thirds of the ring are formed of shorter curved septa, that 

 meet internally to build up a continuous inner boundary to the 

 septal riDg. 



Minor septa are practically absent in the young stage (PI. XXX, 

 fig. 4 a), but in later stages (fig. 4 6) they become a conspicuous and 

 diagnostic feature ; at the rim of the calyx they equal in promi- 

 nence the majors. 



The tabulae occasionally stretch completely across the vertical 

 section without interosculation; but the majority of the tabulae 

 split, so as to form broad cushion-like vesicles (PI. XXX, fig. 4 c). 

 All the tabulae bend down at the wall. 



Vesicles are developed only in the adult stage, and especially 

 at the thickened rings and on the convex side (fig. 4 c — the vesicles 

 present on the convex side have been accidentally blocked out in 

 the print) ; these vesicles are vertically elongated, and shift the 

 septal base-line inwards. 



In the absence of the earliest stage, which is probably cornute, 

 the position of the fossula is difficult to fix; it probably lay 

 opposite the longer septa, although the tabulae are apparently 

 depressed on that side. 



Comparison with Ampleccus cornu-arietis de Kon. 



1 Nouvelles Kecherches ' p. 72 & pi. vi, figs. 4, 4 a. 



The external characters — form and calyx — of the Burrington 

 species present a strong general resemblance to L. G. de Koninck's 

 figures, although it is difficult to believe that his figures are both 

 views of the same specimen. In his description at p. 72 of the 

 text, that author mentions a deep fossula — a fact that immediately 

 separates his species from ours, and suggests that Mr. Carruthers 

 is right in including Amplexus cornu-arietis as a synonym of 

 Caninia cornucopia?. 



Comparison with Endophyllum priscum 

 (Miinster) Freeh. 



The cross-section of the young stage of E. priscum x is almost 

 identical with fig. 4 a of our PI. XXX, and the tabulae are of the 

 same nature. 



The development of vertically-elongated peripheral vesicles in the 

 adult is on the same plan as in our species — although the degree 

 of development is very much greater in Prof. Freeh's figure, and 

 separates the two forms specifically. 



The habit that the septa often show in E. priscum, of leaning 

 against one another, is also exhibited in certain adult sections of 

 E. burringtonense. 



There can be no question that E. burringtonense and E. priscum 

 are distinct species of the same genus. 



1 Zeitscbr. Deutsch. Geol. Gesel^ch. vol. xxxvii (1885) pi. x, fig. 2. 



