112 
Rah. in calcaria miocenica media prope « Monte Gibbio » di- | 
tionis saxolanae mutinensis. 
Biddiilphìa Tuomeyi (Bail.) Roper var. media (1910). : 
Valvis laxius quam in forma typica punctatis cornubus et gibba 
centrali nec admodum gibbas laterales superantibus marginibus hya- 
linis, elatis altioribus inter cornua et gibbam centralem intercedenti- 
bus; spinulis parvis, punctis parce prominentioribus e paucis gibbae 
centrali insistentibus. 
Longitudo valvarum : 1 00 [x. 
Latitudo valvarum: 42 jx. 
Altitudo valvarum: maxima in cornubus 27 ix, maxima in gibba 
centrali 25 [x. 
Hab. in calcaria miocenica media prope « Marmorito » ditionis 
alexandrinae Pedemontii. 
— var. centro spinosa (1910). 
Valvis densissime punctatis, punctis spinulas breves aemulanti- 
bus, regulariter in series ex centro radiantes ordinatis, cornubus et 
gibba centrali, e latere observatis, prominentibus sed pariter crassis, 
spinis longis, erectis, subtilibus, hyalinis, centro gibbae majoris fa- 
sciculatim coalitis. 
Longitudo valvarum: lyS |x. 
Latitudo valvarum : 70 {x. 
Altitudo valvarum: in cornubus 65 [x, in gibba centrali 68 [x. 
Hab. in calcaria miocenica media ad « Marmorito » ditionis 
alexandrinae Pedemontii. 
— var. distenta (1913). 
Valvis e maximis, oblongo ellipticis, late sinuatis, regulariter, 
satis dense, seriatim granulatis; granulis in series radiantes, symme- 
trice secus axem majorem ordinatas, aggregatis, centro in gibba cen- 
trali insito paulo majoribus, irregulariter coalitis; marginibus fragili- 
bus, eximie elatis, gibbas omnes superantibus; spinis inconspicuis; 
gibbis rotundatis, parcissime elatis, media laterales paene superanti, 
cornubus extrorsum patentibus parce prominentibus. 
Longitudo valvarum: 205-240 {x. 
Latitudo valvarum : 70-74 [x. 
Altitudo valvarum: in cornubus 52 {j.; in gibba centrali 32 {jq 
in margine 40 (x. 
