OF SOUTHEFtX IXDIA. 
13 
sinuala, sinu circiter 20 — 25 costato ; valca neurali apice aeuto, volde inciirvo, 
forfnnine moderalo, ovali, dcUidio parvo, medio indislincte sulcalo, fere omnino cir- 
cumdelo instnicta ; costis nmJjomdihus anyulalis, dislinclis, aream in uLrociue latere 
hrecem, concatam, Iceticjalani, murylnantlbus. 
The form of the shell of this species is subject to somewliat similar variations, 
as that of tlic European lilii/n. Curderi and Grasana, from both of which it is readily 
distinguished by the much iiuer and more numerous costidations, and by the strong- 
ly incurved, pointed, and comparatively small beak of tlic neural valve, which is 
also laterally mucb less indented than is, for instance, the case in li. Cuvieri. 
Tlie Inemal valve of B. nnlans is somewhat more convex than the neural one, 
the frontal sinus is moderately depressed and never reaches the level of the con- 
vexity of the former Anlve ; it is marked by aboiit 20 or 25 ribs. The beak ridges 
meet under an angle of about 100°, arc slightly concave, and enclose between 
them and the binge margin of the valve a moderately excavated, smooth area. 
The foramen is clongatcly ovate and entirely surrounded l)y the deltidium, which 
is, however, very tliin on the apical side of it, and hardly meeting with its two 
branches, A\hile on the hinge side it is indistinctly grooved along the middle. The 
hingc-tcetb of tbe neural valve arc tubercular, strong, and about four millim. dis- 
tant from each other. 
LocaUtij . — South by West of Wulloor ; four specimens have been obtained in 
a white, highly calcareous, sandstone. 
Formation . — Arrialoor group. 
0. Euyxciioxella plicatiloides, Stoliczka, PI. I, Figs. IT — 28, 
and PI. II, Figs. 1— G. 
Bhyn. testa transverse pAus minusve late ohorata, hrevissime roslrata, valca 
licemali altera midlo convexiore, medio maxime elecata, lateraliter leciter declivi ; 
valva neurali anlice ahnipde laleque depressa, postice pammi lumklula atqne umhone 
hrevi, aento ct talde inciirvo, instnicta ; f route suhtruncala,fcre simplici vel nmltiplica- 
tida, medio prof unde sinuala ; sinu tertiam partem latitmlinis testa; a;quante, planitieni 
convexitatis valva; haemalis altingente, vel saipius hreviore, supra angulatini et late 
truncalo, sen rarius fere uniforme convexo ; superficie rarissime coslulis crassiusculis, 
circiter 34, tecta, pier unique multicoslulaia , coslulis circiler p)artim simpUcihus 
partini dichotoniis, a;qualihus, in juniorihns numerose squamulosis, in adnltis aid 
Iccvigalis aid periplieriam versus lineis incrementi (una vel plurihusj abruple in- 
ter sectis ; for amine parvo, infra et lateraliter deltidio marginato, marginihus laterali- 
hus acute elevatis ; jugis umhonaUhus valva; neuralis parvis, fexuose curvatis, aream 
in utroque latere angiislissimam marginanlibns. 
This species so closely resembles the well known Blign. plicatilis. Sow., as 
restricted, and distinguished* from octo-pilicata, Bow., that I was for a long 
* Comp. Sclilcenback in Silzungsb. Abaci., Wien, Matb. Nat. Klassc, 1868, vol. LVII, p. 218, and Jabrb. iur 
i^Iinerab, 1869, p. 822. 
B 
