500 A, CHAMPERNOWNE ON SOME ZAPHRENTOID 
septa can be recognized between them. The surface of the tabule 
is very uneven, and appears to have small blisters and a pitted 
aspect between the ends of the septa. The fossula is very deep, 
formed chiefly by an inflexion of the tabule, and some of the 
adjoining septa bend towards and partly enclose it. There is no 
marked curvature in any direction. 
Obs. We have here characters which appear to come very near to 
the genus Streptelasma, Hall. They consist in the confused nature 
of the central area above mentioned ; but there is no distinct twisting 
of the septa such as the name implies. Rominger, however, regards 
Streptelasma as only a subgenus of Zaphrentis, and so far as the 
twisting of the septa is concerned, his figures of Z. Stokesti, M.- 
Edwards, certainly have it no less than Strept. corniculum, Hall, 
on the same plate*. Consequently, on the principle that the 
greater includes the less, I leave the specimen provisionally in™ 
Laphrentis ¥. 
Loc. Pit-Park quarry, Dartington, in dolomitic beds of Middle 
Devonian limestone. 
[ Note.—I refrain from suggesting specific names for the last two 
specimens, although they seem quite distinct; but my knowledge 
of the American forms being very limited, it might only lead to 
confusion were I to attempt it. | 
AMPLEXUs or ZAPHRENTIS? (Plate XXI. fig. 6.) 
Casts in dolomitic limestone similar to the one here drawn are 
common in the Dartington limestone at certain spots. The surface 
of the tabulze is generally smooth, but faint lines from some of the 
principal septa extend nearly to the centre. The latter number 
about 40, a rudimentary series existing between them connected by 
sparse dissepiments. No septal fossula is visible, but probably such 
existed, at least on the upper floors. 
Loc. Dartington, in dolomitic beds of Middle Devonian limestone. 
ZAPHRENTIS, sp. (Plate XXI. fig. 7, and Plate XXIII. figs. 1a, 
ib.) 
Epitheca strong; septa 66 and 78, of two orders, of which the 
principal ones extend some way towards the centre, whilst the 
secondaries are scarcely more than rudimentary. The position of 
the fossula can be noted in both specimens ; but a deceptive appear- 
ance of it has been given to the specimen Pl. XXI. fig. 7. The len- 
ticular dark spot at the bottom of the figure is accidental, and is not 
the fossula. That feature can be observed in the original (in the 
British Museum) nearly opposite to the dark spot, but the artist 
has failed to represent it. The figure, unfortunately, does not give 
the details well, being too diagrammatic. 
Loc. Pl. XXI. fig. 7 (Brit. Mus.), Woolborough quarry, near 
* ine.ipl. ite 
+ It is well to be on one’s guard against being unduly swayed by strati- 
graphical considerations in estimating the value of two closely allied genera or 
species. 
