

868 



MIUropko.HM.-l 



tlu> -lit 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 axi- of the volutions. 



HH.I.KKMHI..N. Mont fort (as restricted by Waagen). Symmetrically involute, 

 subglobo.se 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 with a more or less deep 

 central emarginution behind which there is a well developed slit-band or an elevated 

 blunt keel: surface s.-ulpture con-Ming of more or less strongly developed striae of 

 growth onh P] >ilit?s Montfort. 



AMKKI. 



l-'i'KKK.N SPBCIKM. 



nrlstr.mi. Upper Silurian. 



'niiulia Lindstrom. Upper Silurian. 

 /;. uphnri-ii Lln<Nlrni I'ppcr Silurian. 

 II. lineattu Gold fun-* D.-vutiian. 

 fl. tit'ierculntu* tl'Orbiifny. Devonian. 

 ntlitet Montfort. CarlKinlfcnms. 

 /;. ''loirrnu* Levellle. Carbon If. r 

 B. rtctirottatta De K<>nin<-k. CarbonlfcrouK. 



>nUfer DeKonlnck. Carboniferous. 

 B. martini I > K'.nlnck. Carboniferous. 

 B. ntlcatulug DeKonlnck. OarboDlfcrm^ 

 II. ferruuaci d'Orblgny. Carboniferous. 

 R. toweHiyi d'Orblirny. Carbon I feroua. 

 />'. ranaltferui OoldfuM. Carboniferous. 



"(i/oKia Sowerb. Carbonlf 

 B. kiuleui Sowerby. Carboniferous. 

 B. cantata* Sowerby Carboniferous. 

 B. plieatui Ryckhold. Carboniferous. 

 B. tongmtialit Phillips. Carboniferous. 

 B. jonetianta DeKonlnck. Permo-Carh. 

 B. oriental* DeKonlnck. Permo-Oarb. 

 It ffini$ Waagen. Permo-Carb. 



iiprtMiut WaaRen. Permo-Carb. 

 B. tqitamatia Waagen. Pcrmo-Carb. 

 />'. I'landfurdinwu Waa.-n !' rrno-Carti. 

 11. irianijularit Waagen. Permo-Carb. 



n. gen. flinch.) (Bellerophon [part.) of authors; Bucania [part.], 

 Waagen, 1880, and Koken, 18S9.) This name is proposed for shells agreeing in all 

 respects with />//#//'//<> excepting that their surfaces are cancellated by regular 

 revolving and transverse striii 1 . 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. />'. '!> in if era, n. sp. (I'lrich.) 



AMKKICAN M-WIKB.* HON 



B. rarinifem I'lrirb : 



B. coma Foerste. Clinton. 



'yorictu White. yuebec >rr. 



.-iron KIlllnKs. Black Hiv,-r, Tri-nlon. 



ntti (d'Orl.ikMiyi Safford. Tr-nton. 



-'. var. buryinentu Ulrlch. Tn-nton. 



.MM* I'lrlrh. Tn-nton. 

 B.aityioftM/w t'lrlrh. Tr.-nton. 

 It. WiMatu* Ulrlch. Trenton. 



ityttoma Meek & Wiirth.-n Trenton. 

 .iJi. D. & "on. 



?*u* Emruonv Loral ne. 

 R. newriu Dlrlch. Lorain--. 



i-ii I'lrlrh. I'tica, Lor . 

 uikri Miller. Richmond group. 

 B. mbangulari* I'lrlch. Richmond group. 



i.rr Hlllmtfs. HudAon Klvi-r Knnip. 

 B. *p. undet. Nlagmra. 

 B. ple*>u Mllllnip. Gup*'. 

 B. jxlopt Hall. Schohari.-k.Ti!. Up. Hi-Id. 



mpinq Mia Meek. Upper Helderberg. 

 It <nifiia Hall. Ch?mung. 

 Tit. combri Wal-'nti I'.-v. nian. 

 B. yibtoni White. St. Louis. 

 B. McMrri* Hall. St. Lout*, Chester. 



<u*u* M. & W. Goal Meaaurea. 

 /{. yi'jnnUu* Worthon. Coal Meaaurea. 

 ,*nariHatiu Conrad. Goal MeMurea. 



iearinatiu Shuiuard. Coal Measures. 



B. gemma Llnd*tr<.m. 1'ppi-r Silurian. 

 B. ioJmttola Llndstn.tn rp[MT Silurian. 



All. MT lb Int. orlflB.Hy dnrrllwd 



t Tb (oar iptolM rrrdltrd lo W <-n wrrr dncrlbrd under 



II other* un<Jrr B<IJ<rr^*<m. 



