236 GREVILLE, ON NEW DIATOMS. 
Entogonia approximata, Grev.—Triceratium approximatum, 
Grev., |. c., p. 84, fig. 11. 
Entogonia variegata, Grev.— Triceratium variegatum, 
Grev., l.c., p. 85, fig. 14. 
Secr. II. Central triangle filled up with various markings. 
Entogonia marginata (Brightw.), Grev.—Triceratium mar- 
ginatum, Brightw., 1. ¢., p. 82, fig. 5. 
Entogonia pulcherrima, Grev.—Triceratium pulcherrimun, 
Grev.; 1. c.,. pose; fiz.6. 
Entogonia amabilis, n. sp., Grev.—Valve with slightly 
convex sides and somewhat obtuse angles; the border com- 
partments punctate ; pseudo-nodule circular, very prominent ; 
central triangle with slender radiating costz, the angles pene- 
trating a circular pseudo-nodular space. Distance between 
the angles about 0042”. (Fig. 21.) 
Hab. Barbadoes deposit, from Cambridge estate. 
This is very similar to EH. pulcherrima in the radiating 
costee of the inner triangle, but the manner in which the 
outer angles are filled up is totally different. Instead of the 
oblong pseudo-nodule, with the lateral costee continued round 
it, we have in the species before us a very prominent cir- 
cular one, and no cost passing round it at all; and instead of 
a pseudo-nodular blank space forming a continuation of the 
oblong outline of the pseudo-nodule, without any contraction 
between the two, we have a circular pseudo-nodular blank 
space immediately beneath the pseudo-nodule itself. 
Entogonia venulosa, nu. sp., Grev.—Valve with straight 
sides and obtuse angles ; the broad border divided into punc- 
tate compartments by perfect and imperfect coste ; central 
triangle punctate, with a few radiating and transverse coste ; 
pseudo-nodular blank space somewhat cup-shaped, and sepa- 
rated from the pseudo-nodule. Distance between the angles 
about ‘0082”. (Fig. 22.) . 
Hab. Barbadoes deposit, from Cambridge estate ; G. Nor- 
man, Esq. 
Perfectly distinct in the minutely punctate inner triangle, 
which is also traversed by a few cost, those in the immedi- 
ate centre radiating. It is peculiar, also, in the pseudo- 
nodular blank space being separated from the pseudo-nodule 
by a punctate compartment or band. ‘The pseudo-nodule is 
roundish, and fills up the angles. 
Entogonia Davyana, Grev.—Triceratium Davyanun, Grev., 
l. c., vol. xi, p. 232, Pl. X, fig. 4. 
Entogonia conspicua, n. sp., Grev.—Valve with straight 
