weeks] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1901. 135 
Paleontology— Continued. 
Genera and species described— Continued. 
Orthotheca stilletto, Matthew, 529. 
Orthothetes Fischer de Waldheim, Grabau, 
306. 
chemungensis arctistriatus Hall, Kindle, 
442. 
hydraulicus (Whitfield), Grabau, 306. 
insequalis (Hall), Weller, 804. 
inflatus? (W. and \V.), Weller, 804. 
minutus n. sp., Cumings, 179. 
subplanus Conrad 1842, Beeeher, 51. 
subplanus (Conrad), Grabau, 306. 
sp. undet., Weller, 804. 
Ostrea eompressirostra, Say, Clark and Mar- 
tin, 141. 
var. alepidota Dall, Clark, and Martin, 
141. 
sellEeformis Conrad, Clark and Martin, 
(Gryphseostrea) vomer (Morton), Clark 
and Martin, 111. 
Otodus obliquus Agassiz, Case, 251. 
Pachysena gigantea O. and W., Matthew, 538. 
Pachydistya foliata Ulr., Sardeson, 672. 
Paleeobolus n. subgen., Matthew, 530. 
bretonensis, Matthew, 530. 
Paloeolagus temnodon n. sp., Douglass, 234a. 
Palseoneilo barrisi (W. and W.), Weller, 804. 
microdonta (Win.), Weller, 804. 
sp., Kindle, 442. 
PalEeosinopa veterrima n. gen. et sp., Mat- 
thew, 538. 
Paludestrina longinqua Gould (Pilsbry), 
Stearns, 727a. 
protea Gould (Pihbry), Stearns, 727a. 
Panenka radians (Hall), Kindle, 442. 
Panopea elongata Conrad, Clark and Martin, 
141. 
Paracyathus marylandicus n. sp., Vaughan, 
765. 
Paraeyclas elliptiea Hall, Kindle, 442. 
elongata Nettleroth, Kindle, 442. 
lirata (Conrad), Kindle, 442. 
octerlonii Nettleroth, Kindle, 442. 
ohioensis (Meek), Kindle, 442. 
Parazyga hirsuta Hall, Kindle, 442. 
Parmophorella (?) paupera Bill., Matthew, 
529. 
Paterula amii Schuchert, Ruedemann, 659. 
Pecten choctawensis Aldrich, Clark and Mar- 
tin, 141. 
dalli Clark, Clark and Martin, 141. 
johnsoni Clark, Clark and Martin, 141. 
sp., Clark and Martin, 141. 
Pentagonia unisulcata (Conrad), Kindle, 442. 
Pentamerella arata (Conrad), Kindle, 442. 
pavilonensis Hall, Kindle, 442. 
thusnelda Nettleroth, Kindle. 1 42. 
Pentamerus Sowerby, Grabau, 306. 
oblongus Sowerby, Grabau, 306. 
Pentremitesaltusn.sp. (Rowley), Greene, 320. 
Pernopecten cooperensis (Shumard), Weller, 
804. 
Phacops cristata Hall, Kindle, 442. 
cristata var. pipa H. and C, Kindle, 442. 
rana (Green), Kindle, 142. 
Phanerotinu.s paradoxus Win., Weller, mil 
Paleontology— Con ti nued . 
Genera and species described— Continued. 
Phehacomya petrosa (Conrad), Clark and 
Martin, 141. 
Pholadomya marylandica Conrad, Clark and 
Martin, 141. 
Pholidops Hall, Grabau, 306. 
squamiformis Hall, Grabau, 306. 
sp., Kindle, 442. 
Pholidostrophia iowensis ( Owen ), Kindle, 442. 
Phyllodus Agassiz, Case. 251. 
hipparionyx n. sp.. Case, 251. 
Phylloporina Ulrich, Grabau, 306. 
asperato-striata (Hall), Grabau, 306. 
corticosa Ulr., Sardeson, 672. 
Physa Draparnaud, Letson, 493. 
heterostropha Say, Letson, 493. 
Pinnas (?) coprolitiformisn. sp., Beede, 55. 
Pisidium Pfeiffer, Letson, 493. 
abditum Hald., Letson, 493. 
compressum Prime, Letson, 493. 
scutellatum Sterki, Letson, 493. 
ultramontanum Prime, Letson, 493. 
virginicum (Gmelin) Bourg., Letson, 493. 
Pityoxylon chasense n. sp., Penhallow, 604. 
Planorbis Guettard, Letson, 493. 
bicarinatus Say, Letson, 493. 
parvus Say, Letson, 493. 
Platidia marylandica n. sp., Clark and Mar- 
tin, 142. 
Platyeeras Conrad, Grabau, 306. 
angulatum (Hall), Grabau, 306. 
amnion Hall, Kindle, 442. 
(?) arctiostoma Ulrich, Kindle, 442. 
blatchleyi n. sp., Kindle, 442 
bucculentum Hall, Kindle, 442. 
carinatum Hall, Kindle, 442. 
circularis n. sp. (Rowley), Greene, 320. 
compressum Nettleroth, Kindle, 442. - 
compressum var., Kindle, 442. 
conicum Hall, Kindle, 442. 
crassum Hall ?, Kindle, 442. 
cymbula n. sp., Matthew, 529. 
dumosum Conrad, Kindle, 442. 
dumosum var. pileum n. var., Kindle, 442. 
dumosum var. rarispinum Hall, Kindle, 
442. 
echinatum Hall, Kindle, 442. 
fornicatum, Kindle, 442. 
linerare n. sp., Kindle, 442. 
milleri Nettleroth, Kindle, 442. 
multispinosum Meek, Kindle, 442. 
niagarense (Hall), Grabau, 306. 
radiatum n. sp., Matthew, 529. 
rictum Hall, Kindle, 412. 
rictum var. spinosa n. var., Kindle, 442. 
subcirculare n. sp., Kindle, 442. 
symmetricum Hall, Kindle, 442. 
thetisHall, Kindle, 412. 
transversum n. sp., Matthew, 529. 
ventricosum Conrad, Kindle, 112. 
sp., Kindle, 442. 
(Orthonychia) fluctuosum Ulrich, Kin- 
dle, 412. 
Platygyra Ehrenberg 1834, Vaughan. 766. 
clivosa (Ellis and Solander), Vaughan, 
766. 
