TABLE IV. — Genealogy 
of the Arietida in the Basin of England, after Wright and 
W. = Wright, and B. — Blake. 
various Collections. 
Middle Lias. 
Oxyn. memismale 
= Amal. Wiltshirei 
WwW. 
Raricostatus Zone. 
= “ bed. 
Cal. aplanatum 
= Ariet. tardecrescens 
B. 
Arn. Macdonelli 
“c 
Cal. raricostatum 1 = Amm. 
Ww 
= Ariet. 
Cal. carusense 
Portl. 
= Ariet. nodotianus W. 
Oxyn. Guibalii 
| 
Ast. Collenoti 
= Megoc. Slatteri 
es yas Leash Care ae | (pars) W. 
Oxyn. Lymense 
| | Ast. denotatum 2am. “~ W py so : er. 
: Schl. = Arietta : ; = Amal,“ * 4 
~ mg { <— "a w | | Same? ? = “* Collenoti Ast. obtusum Oxyn. Simpsoni | 
a 2 (pars) W. = Arigtaete =Amal. “ W. 
| | | : = Agoc. sagittarium 
Ast. impendens = Slatteri Oxyn. oxynotum Amal. Guibalianum 
| | | = cae : (pars) W. AMAL, ; ' Ww. 
= “* Collenoti 1 
| | (pars) W. | 1 
| 1 
f : Ast. stellare 1 
| | = Ariet. “ W. te. uk ole oe 
Obtusus Zone. | | | Same Same? | 
= “ bed. Ast. obtusum- Agas. levigatum — — — — — 
| | | a hipts W: Amn. Sow 
= Amm. Smithi Sow. | 
| 
| 
| | 
Ast. Brooki 
| | | = Ariet W: | 
beter es ad | | Ver. Conybeari Same | 
‘Tile ia oa ‘ = Ariet. Bonardi W. = geometricus W. Ast. Turneri Ast. ObtUSUM) nel 
gi 
| | = Ariet. “‘ | 
L | | | | | 
r ] | 
Arn. Bodleyi Cor. bisuleatum Cor. Gmuendense | ee 
| | | = Ariet. difformis B. = Ariet. subnodosus = Ariet. Crossi W. cc. “ie eo oe ee ee ionamin 
= “ semicostatum (posit. uncertain) W. = Ariet. = 
| 1 (pars) W. 
Arn. Hartmanni 
Upper | ; | | | 
Bucklandi Zone. 4 Schl. Boucaultiana Arn. Ceras 
4 “ bed. 3 “ Ww. | , 
Arn. tardecrescens l 
| | 
Arn. semicostatum———_«-Arn. falcaries Cor. Sauzeanum : 
| | = Ariet.2 “ (pars) W. = Ariets 6 | 
{ | | | | 
r | | ! 
| | Cor. lyra 
| —— -—| = Ariet. bisuleatus W. | 
| Cor. Bucklandi 
| =Ariet. “  W 
| 
Lower | | Cor. rotiforme Cor. Bucklandi | 
Bucklandi Zone. 4 Schl. Charmassei Ver. Conybeari | = Ariet. “ (pars)W. = Ariet. sinemuriense 
= “ bed. | == Aigoe. “= | == Aliens. ** OW, | B. | 
| 
| | 7 | | 
| Ver. spiratissimum j—- -—- — a a ae ee eee | 
[ (position uncertain) 
| | 
f sate | 
Ariet. Conybeari B. 
Schl. angulata | | H . 
= Higoc. “ Cal. laqueum 4 
| | i 
on ao Schl. colubrata | ' 
as ved. 4 = &goc. morianum W. Cal. liasicum 
a, ane “4 aa zone = JEgoc. laqueolus W. | i 
oe | Schl. catenata 
= goc. “ W. Same Same ————Cal. Jaqueum | 
: 4 == /Egoc. intermedium (pars) 
= *  Belcheri (pars) W. | 
= Amm. intermedium Portl. | 
| 
Cal. Johnstoni Cal. tortile | . 
= Hgoc. “ = Zgoc. intermedium | 1 May also occur in Oxynotus Zone, according to Wright. 
Planorbis Zone. y, 
= bed. 
= Belcheri (pars) ad 
Psil. planorbe var. lev 
“ac Ww 
= ZEgoc. 
= Amm. 
| (pars) W. 
4 Sow. 
erugatus Bean. 
Psil. planorbe var. plicatum 
= Amm. Johnstoni (Authors). 
| 2 See Wright’s Plates, pl. 6, figs. 2 and 3. 
3 The lines connecting the species of Arnioceras indicate 
genetic bonds only in a very general way. The true succes- 
sion of the forms is not given in this part of this table. 
