408 Mr. W. D. Lang—Revision of the 
THORACOPORA, gen. nov. 
Genotype. 7. costata. 
Tabular Diagnoses of the Species. 
A. Larger, about 2 mm.; avicularia larger; cost 
very slightly fuus ed or not fused medianly .... 1. 7. raptriz. 
B. Smaller, about 3-2 mm, 
I. Avicularia smaller, hardly spatulate ........ 2. T. pontifera. 
II. Avicularia larger, spatulate.............00. 3. T. costata. 
]. 7. rapirir, sp. mn. 
Type-specimen. British Museum, D. 11135 ; Lower Seno- 
nian; Chatham, Kent. 
2. T. | Membraniporella| pontifera (Brydone), 1916, Geol. 
Mag. dec. vi. vol. ii. p 99, pl. vi. fig. 8; coranguinum- 
zone ; Gravesend, Kent. 
3. T. costata, sp. n. 
Type-specumen. British Museum, D. 24406 ; coranguinum- 
zone ; Luton, 8.E. of Chatham, Kent. 
Indeterminable Described Forms. 
A. Described by d’Orbigny, 1851-3, Pal. Franc., Ter. Cret. 
vol. v. :— 
1. Escharella arge, 1851, pl. 666. figs. 7-9, 1852, p.219; Senonian ; 
Royan. 
2. Rimies Napier complanata, 1852, pl. 718. figs. 17-20, 1853, 
p. 484; Senonian ; Vendome. 
3. Reptescharella costata, 1852, pl. 716. figs. 16-18, 1853, p 470; 
Senonian; Tours. 
4, Reptescharipora exigua, 1852, pl. 719. figs. 20-22, 1853, p. 491 ; 
Senonian; Meudon. 
5. Disteginopora francqana, 1852, pl. 784. figs. 9-11, 1853, p. 498; 
Senonian ; Meudon. 
6. Reptescharella inequalis, 1852, pl. 716. figs. 1-8, 1853, p. 467 ; 
Senonian ; France. 
7. Escharipora inornata, 1851, pl. 686. figs. 17-19, 1852, p. 230; 
Senonian ; Sainte-Colombe. 
8. Semiescharipora trregularis, 1852, pl. 719. figs. 9-12, 18653, 
p- 487 ; Senonian; Saintes, Pons. 
9. Steginopora irregularis, 1852, pl. 720. figs. 16-19, 1853, p. 500 ; 
Senonian ; Saintes. 
