WEEKS. 
PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1904. 199 
Paleontology — Continued. 
Genera and species described — Continued. 
Hydractinia multispinosa n. sp., Ulrica, 3. 
Hylopus Dawson, Matthew, 4. 
caudifer Dawson, Matthew, 1. 
hardingi Dawson, Matthew, 1,4. 
Hyphepus E. Hitchcock, Lull, 1. 
Heidi E. Hitchcock, Lull, 1. 
Hypocetus Lydekker, Case, 4. 
mediatlanticus (Cope), Case 4. 
Hypohippus Leidy, Gidley, 1. 
Idmonea ? expansa n. sp., Ulrich and Bassler, 
4. 
Illa;nus armatus Hall, Kindle and Breger, 1. 
insignis Hall, Kindle and Breger, 1. 
ioxus Hall, Kindle and Breger, 1. 
Illicium lignitum Lx., Perkins, 6. 
Ilyanassa? (Paranassa) porcina (Say), Martin, 
3. 
Inoceramya n. gen., Ulrich, 1. 
concentrica n. sp., Ulrich, 1. 
Ischyrocyon n. gen., Matthew, Matthew and 
Gidley, 1. 
hysenodus n. sp., Matthew, Matthew and 
Gidley, 1. 
Isocarape E. Hitchcock, Lull, 1. 
strata E. Hitchcock, Lull, 1. 
Isocardia fraterna Say, Glenn, 5. 
ignolea n. sp., Glenn, 5. 
mai'koei Conrad, Glenn, 5. 
rnazlea n. sp., Glenn, 5. 
Ixacanthus Cope, Case, 4. 
atropius Cope, Case, 4. 
ceelospondylus Cope, Case, 4. 
conradi (Leidy), Case, 4. 
spinosus Cope, Case, 4. 
stenus Cope, Case, 4. 
' Jaekelocystis Schuchert, 4. 
avellana n. sp., Schuchert, 4. 
hartleyi Schuchert, Schuchert, 4. 
papillatus n, sp., Schuchert, 4. 
Juglans brandonianus n. sp., Perkins, 6. 
Kellia rotundula n. sp., Glenn, 5. 
Koninckites Waagen, Smith (J. P.), 2. 
Labidosaurus harnatus Cope, Broili, 1. 
Labiosa (Raeta) sp., Glenn, 5. 
Lagunculapes E. Hitchcock, Lull, 1. 
latus E. Hitchcock, Lull, 1. 
Lampterocrinus? comptus n. sp., Rowley, 1. 
Laurus angusta Heer, Hollick, 2. 
hollickii Berry, Berry, 1. 
plutonia Heer, Berry, 1. 
protesefolia Lesq., Berry, 1. 
Lecanocrinus hemisphericus n. sp., Rowley, 1. 
Leda concentrica (Say), Glenn, 5. 
liciata (Conrad), Glenn, 5. 
liciata var. amydra Dall, Glenn, 5. 
sp., Dall, 1. 
Lepidechinus Hall, Klem, 1. 
imbricatus Hall, Klem, 1. 
rarispinus Hall, Klem, 1. 
Lepidesthes Meek and Worthen, Klem, 1. 
colletti White, Klem, 1. 
coreyi Meek and Worthen, Klem, 1. 
formosus Miller, Klem, 1. 
spectabilis Worthen and Miller, Klem, 1. 
wortheni Jackson, Klem, 1. 
Paleontology — Continued. 
Gent ra and species described — Continued. 
Lepidocidaris Meek and Worthen, Klem, 1. 
squamosus Meek and Worthen, Klem, 1. 
Lepidodendronkeyesin.sp.,Herrick(C.L.), 1. 
socorroense n. sp., Herrick (C. L.), 1. 
thwaitesi n. sp., Herrick (C. L.), 1. 
thwaitesi var. striolatum n. var., Herrick 
(C. L.),l. 
sp.?, Herrick (C. L.), 1. 
Lepocrinites Conrad, Schuchert, 4. 
gebhardii Conrad, Schuchert, i. 
manlius n. sp., Schuchert, 4. 
Lepralia maculata n. sp., Ulrich and Bass- 
ler, 4. 
marylandica n. sp., Ulrich and Bassler, 4. 
montirera n. sp., Ulrich and Bassler, 4. 
? reversa n. sp., Ulrich and Bassler, 4. 
Leptsena rhomboidalis Wilckens, Kindle and 
Breger, 1. 
Leptosurcula n. gen., Casey, 1. 
Leptotrypa Ulrich, Ulrich and Bassler, 2. 
Lima papyria (Conrad) , Glenn, 5. 
Limipecten n. gen., Girty, 1. 
texanus n.sp., Girty, 1. 
texanus var. grandicostatus n. var., 
Girty, 1. 
Limnopus vagans Marsh, Matthew, 1. 
Linearia ? divaricata n. sp., Johnson, 1. 
Lioclema Ulrich, Ulrich and Bassler, 2. 
monroei n. sp., Ulrich and Bassler, 2. 
punctatum (Hall), Ulrich and Bassler,2. 
Lioclemella Foerste, Ulrich and Bassler, 2. 
ohioensis (Foerste), Ulrich and Bassler, 2. 
Liriodendropsis angustifolia Newb., Berry, 1. 
Lirosoma sulcosa Conrad, Martin, 3. 
Lithasteriscus radiatus Ehrenberg, Martin, 6. 
Lithocampe marylandica n. sp., Martin, 6. 
Lithodrumus n. gen., Greene, 1. 
veryi n. sp., Greene, 1, 
Lithophaga ionensis n. sp., Glenn, 5. 
subalveata Conrad, Glenn, 5. 
Littorina irrorata (Say), Martin, 3. 
Lituites (Ophidioceras) bickmoreanus Whit- 
field, Kindle and Breger, 1. 
(Ophidioceras) hercules carrollensis n. 
var., Kindle and Breger, 1. 
marshii Hall, Kindle and Breger, 1. 
Loganograptus Hall, Ruedemann, 1. 
logani Hallj Ruedemann, 1. 
Lophocetus Cope, Case, 4. 
calvertensis (Harlan), Case, 4. 
Loxonema robusta Hall, Parks, 1. 
Lutra pristina n. sp., Matthew, Matthew and 
Gidley, 1. 
Lyrosurcula n. gen., Casey, 1. 
acuta n. sp., Casey, 1. 
elegans n. sp., Casey, 1. 
obsoleta n. sp., Casey, 1. 
Lysorophus tricarinatus Cope, Broili, 1. 
Lytoloma Cope, Wieland, 2. 
angusta Cope, Wieland, 2. 
(Euclastes) platyops Cope, Wieland, 2. 
Macoma lenis (Conrad), Glenn, 5. 
marylandica n. sp., Glenn, 5. 
Macrocallista (Chionella?) gilberti n. sp., 
Dall, 1. 
