weeks] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1901. 133 
Paleontology— Continued. 
Genera and species described— Continued. 
Leptodesma marcellense Hall, Wood, 855. 
rogersi Hall, Kindle, 442. 
Leptopora ramosa n. sp., Rowley, 658. 
procera n. sp., Rowley, 658. 
typa Win., Weller, 804. 
Leptopsis levettei, White, Rowley, Greene, 
320. 
Leueiseus turneri n. sp., Lucas, 504. 
Levifusus trabeatus (?) Conrad, Clark and 
Martin, 141. 
trabeatus (?) var., Clark and Martin, 141. 
Lichas Dalman, Grabau, 306. 
boltoni (Bigsby), Grabau, 306. 
nereus Hall, Van Ingen, 763. 
sp., Kindle, 442. 
Lichenalia Hall, Grabau, 306. 
concentrica Hall, Grabau, 306. 
Limnsea Lamarck, Letson, 493. 
catascopium Say, Letson, 493. 
columella Say, Letson, 493. 
desidiosa Say, Letson, 493. 
Limnenetes n. gen., Douglass, 234a. 
(?) anceps n. sp., Douglass, 234a. 
platyceps n. sp.. Douglass, 234a. 
Limoptera cancellata Hall, Kindle, 442. 
Lingula Brugniere, Grabau, 306. 
cuneata Conrad. Grabau, 306. 
spatulata Vanuxem, Kindle, 442. 
Lingulella gregwa n. sp., Matthew, 530. 
tumida n. sp., Matthew, 530. 
Lioclema Ulrich, Grabau, 306. 
aspera (Hall), Grabau, 306. 
florida (Hall), Grabau. 306. 
Liopteria Hall, Grabau, 306. 
(?) subplana (Hall), Grabau, 306. 
Liospiraamericana Billings sp., Ruedemann, 
660. 
subtilistriate Hall sp., Ruedemann, 660. 
Lithophaga marylandica n. sp., Clark and 
Martin, 141. 
minuta n. sp., Weller, 804 
Litiopa marylandica n. sp., Clark and Mar- 
tin, 141. 
Loirhynchus limitare (Vanuxem), Wood, 855. 
Lophoblastus n. gen., Rowley, 658. 
conoideus n. sp., Rowley, 658. 
marginulus n. sp., Rowley, 658. 
Loxonema hamiltonise Hall, Kindle, 442. 
hydraulica Hall, Kindle, 442. 
lseviusculum Hall, Kindle, 442. 
rectistriatum Hall, Kindle, 442. 
(?) teres Hall, Kindle, 442. 
sp., Kindle, 442. 
sp. undet., Weller, 804. 
Lucina aquiana Clark, Clark and Martin, 141. 
astartiformis Aldrich, Clark and Martin, 
141. 
dartoni Clark and Martin, 141. 
megameris, Dall, 188. 
uhleri Clark, Clark and Martin, 141. 
whitei Clark, Clark and Martin, 141. 
sp., Clark and Martin, 141. 
Lunatia marylandica Conrad, Clark and 
Martin, 141. 
Lunulicardium fragile Hall. Wood, 855 
Paleontology— Continued. 
Genera and speeies described— Continued. 
Lunulites reversa n.sp., Ulrich, 751. 
Lyriocrinus dactylus Hall, Grabau, 306. 
Lyriopecten Hall, Grabau, 306. 
orbiculoides (nom.) (nov.), Grabau, 306. 
Lytoceras (Gaudryceras) denmanense, Whit- 
eaves, 820. 
Macrocheilina carinatus Nettleroth, Kindle, 
442. 
hebe Hall, Kindle, 442. 
onondagsensis n. sp., Clarke, 145. 
sp., Kindle, 442. 
Mancalla californiensis n. sp., Lucas, 504a. 
Macrodon parvus W. & W., Weller, 804. 
Macronotella fragaria n. sp., Ruedemann, 660. 
ulrichi n. sp., Ruedemann, 660. 
Mangilia (Pleurotomella) bellistriata, Clark 
and Martin, 141. 
Marginulina costata (Batsch.), Bagg, 35. 
Martinia subumbona (Hall), Kindle, 442. 
williamsi n. sp., Kindle, 442. 
Meandrina Lamarck, Vaughan, 766. 
maeandrites (Linnseus), Vaughan, 766. 
Megistocrinus circulus n. sp. (Rowley), 
Greene, 320. 
corniger n. sp. (Rowley), Greene, 320. 
expansus, Miller & Gurley, Rowley, 
Greene, 320. 
expansus var. inflatus, n. var. (Rowley), 
Greene, 320. 
unicornis n. sp. (Rowley), Greene, 320. 
Melania exigua Conrad, Stearns, 727a. 
Melongena (?) potomacensisn. sp., Clark and 
Martin, 141. 
Membranipora angusta n. sp., Ulrich, 751. 
rimulata n. sp., Ulrich, 751. 
spiculosa n. sp., Ulrich, 751. 
Meretrix lenis (Conrad), Clark and Martin, 
141. 
ovata var. ovata (Rogers), Clark and 
Martin, 141. 
ovata var. pyga Conrad, Clark and Mar- 
tin, 141. 
subimpressa Conrad, Clark and Martin, 
141. 
Meristella barrisi Hall, Kindle, 442. 
nasuta (Conrad), Kindle, 442. 
Meristina maria Hall 1863, Beecher, 51. 
rectirostris Hall 1882, Beecher, 51. 
Merycochcerus altiramus n. sp., Douglas, 234. 
compressidens n. sp., Douglas, 234. 
elrodi n.sp., Douglas, 234. 
madisonius n. sp., Douglas, 234. 
? obliquidens?, Douglas, 234. 
Mesalia obruta (Conrad), Clark and Martin, 
141. 
Metopoma explanata n. sp., Sardeson, 677. 
Metula marylandica n. sp., Clark and Martin, 
141. 
Michelinia convexa D'Orbigny, Beecher, 51. 
Microdon leptogaster (Win.), Weller, 804. 
Mimulus waldronesis Miller and Dyer 1878, 
Beecher, 51. 
Mitra marylandica Clark, Clark and Martin, 
141. 
pomonkensis n. sp., Clark and Martin, 141. 
