388 MR. G. S. BRADY ON NEW OR IMPERFECTLY 
I can gather from published descriptions and the examination of fossil specimens, is 
generically distinct. I much regret that in the attempt to separate the valves of my 
specimen, for:the purpose of examining the animal, one of them was destroyed ; so that 
I am able to describe the hinge-apparatus of the right valve only. The posterior pro- 
cess is hollow (apparently) quite to its extremity; from its anterior basal margin a 
curved claw-like process projects backwards, and probably articulates with a similar 
process of the opposite valve. This is represented at Pl. LXII. fig. 6, d,g,h. The 
anterior hinge consists of a strong projection, analogous to that of Cythere and Cypridina, 
and of a concave facet, which appears adapted to receive a protuberance of the opposite 
valve (fig. 6, d). 
The species is named after Arthur Adams, Esq., R.N., to whose kindness I am 
indebted for it and for the Cypridine described in this paper. 
Bairdia amygdaloides, 364. 
bosquetiana, 364. 
crosskeiana, 366. 
fusca, 364. 
lithodomoides, 367. 
ovata. 364. 
oviformis, 364. 
subdeltoidea, 365. 
Cypridina bairdii, 387. 
canaliculata, 373. 
clathrata, 376. 
elongata, 386. 
japonica, 386. 
plicata, 383. 
plicatula, 374. 
Cythere bornemanni, 376. 
areolata, 381. 
bradii, 370. 
canaliculata, 373. 
catenata, 374. 
clathrata, 376. 
compacta, 380. 
costata, 375. 
cribriformis, 379. 
hexangulatopora, 376. 
hodgii, 373. 
jurinei, 372. 
lactea, 377. 
var. rudis, 378. 
latissima, 381. 
INDEX. 
Cythere latimaryinata, 376. 
lyrata, 376. 
mamillata, 373. 
milleri, 371. 
normani, 379. 
oblonga, 373. 
parkeri, 380. 
pavonia, 378. 
plicatula, 374. 
producta, 378. 
pumicosa, 379. 
pumila, 378. 
rhomboidea, 381. 
scabra, 380. 
septentrionalis, 375. 
setosa, 372. 
simplex, 363. 
subdeltoidea, 365. 
venata, 374. 
Cythereis batei, 384. 
cristatella, 384. 
fungoides, 385. 
lacerata, 385. 
militaris, 385. 
spinosissima, 386. 
subcoronata, 384. 
Cytherella beyrichi, 362. 
compressa, 362. 
rugosa, 362. 
Cytherella pulchra, 361. 
punctata, 362. 
Cytheridea curta, 370. 
kirkbii, 369. 
margaritea, 370. 
minima, 370. 
miilleri, 371. 
ovata, 364. 
papillosa, 370. 
Cytherideis decora, 366. 
gracilis, 367. 
lata, 368. 
maculata, 367. 
nobilis, 368. 
oryza, 368. 
pulchra, 368. 
tigrina, 369. 
Cytherina beyrichi, 362. 
gracilis, 367. 
miilleri, 371. 
ovulum, 370. 
Heterodesmus adamsii, 387. 
Jonesia simplex, 363. 
Normania affinis, 382. 
avellana, 382. 
dorso-tuberculata, 383. 
glabra, 382. 
grisea, 383. 
modesta, 383. 
