GASTROPODA. 853 
Bellerophontiida.] 
the slit short; slit-band always present. Surface with lines of growth only, or 
cancellated, the revolving lines straight and never oblique with respect to the 
longitudinal axis of the volutions, 
BretitEeropHon, Montfort (as restricted by Waagen). Symmetrically involute, 
subglobose shells, with or without an umbilicus, the latter never very large in the 
typical section; volutions more or less rounded on the back; aperture generally 
expanded, usually with a callosity on the inner lip; outer lip witha more or less deep 
central emargination behind which there is a well developed slit-band or an elevated 
blunt keel; surface sculpture consisting of more or less strongly developed striz of 
growth only. Type, B. vasulites Montfort. 
AMERICAN SPECIES. FOREIGN SPECIES. 
. allegoricus White. Quebec gr. B. fasciatus Lindstrom. Upper Silurian. 
. charon Billings. Black River, Trenton. B. globulus Lindstrom. Upper Silurian. 
. troosti (V’Orbigny) Safford. Trenton. 
troostt, var. burginensis Ulrich. Trenton. 
. clausus Ulrich. ‘Trenton. 
. subglobulus Ulrich. Trenton. 
. bilineatus Ulrich. “Trenton. 
. platystoma Meek & Worthen. Trenton. 
. similis U. &S. Trenton. 
. rugosus Emmons. Loraine. 
. recurvus Ulrich. Loraine. 
capax Ulrich. Utica, Loraine. 
. mohri Miller. Richmond group. 
. subangularis Ulrich. Richmond group. - 
. miser Billings. Hudson River group. 
sp. undet. Niagara. 
. plenus Billings. Gaspé. 
pelops Hall. Schoharie grit, Up. Held. 
propinquus Meek. Upper Helderberg. 
. nactus Hall. Chemung. 
. combsi Walcott. Devonian. 
. gibsont White. St. Louis. 
. Sublevis Hall. St. Louis, Chester. 
. crassus M. & W. Coal Measures. 
. giganteus Worthen. Coal Measures. 
. percarinatus Conrad. Coal Measures. 
. tricarinatus Shumard. Coal Measures. 
. sphaera Lindstrom Upper Silurian. 
. lineatus Goldfuss. Devonian. 
. tuberculatus @’Orbigny. Devonian. 
. vasulites Montfort. Carboniferous. 
. bicarenus Leveille. Carboniferous. 
. recticostatus De Koninck. Carboniferous. 
. scalifer De Koninock. Carboniferous. 
. marting De Koninck, Carboniferous. 
. sulcatulus De Koninck. Carboniferous. 
. ferrussaci d’Orbigny. Carboniferous. 
. sowerbyt VOrbigny. Carboniferous. 
canaliferus Goldfuss. Carboniferous. 
. tenuifascia Sowerb. Carboniferous. 
. hiulcus Sowerby. Carboniferous. 
costatus Sowerby. Carboniferous. 
. plicatus Ryckhold. Carboniferous. 
tengentialis Phillips. Carboniferous. 
. jonesianus DeKoninck. Permo-Carb. 
. orientalis DeKoninck. Permo-Carb. 
. affinis Waagen. Permo-Carb. 
. impressus Waagen. Permo-Carb. 
. squamatus Waagen. Permo-Carb. 
. blandfordianus Waagen. Permo-Carb. 
. triangularis Waagen. Permo-Carb. 
ba bdwoab Sho dbbb bbb bbb bso bss 
eelcchecMesicsileslechc coi oMesile=licelles ey ieelleollusflesllcsite sce leis» 
Bucanopsis, n. gen. (Ulrich.) (Bellerophon [part.] of authors; Bucania [part.], 
Waagen, 1880, and Koken, 1889.) This name is proposed for shells agreeing in all 
respects with Bellerophon excepting that their surfaces are cancellated by regular 
revolving and transverse strize. The volutions enlarge rapidly, giving a broadly, 
expanded aperture; the umbilicus is of moderate size and may be closed entirely, 
while the inner lip is always somewhat thickened. The revolving lines are never 
oblique nor wrinkled. ‘Type, B. carinifera, n. sp. (Ulrich.) 
AMERICAN SPECIES.* FOREIGN SPECIES.} 
B. carinifera Ulrich. Trenton. B. gemma Lindstrom. Upper Silurian. 
B. exigua Foerste. Clinton. B. latevittata Lindstrom. Upper Silurian. 
* All, save the first, originally described under Bellerophon. 
+ The four species credited to Waagen were described under Bucania, all others under Bellerophon. 
