310 
REr.\ciiir. 
P. 2210. Two fine spines, somcwliat abraded, Ibc cxserted portion 
measuring 0'28 in length ; also three fragments ; Kim- 
meridgo Clay, Kimmoridgo, Dorsetshire. K<jerton Coll. 
25300. Greater portion of an enormous spine, the exsorted portion 
originally about 0-48 in length, and the extremity exhi- 
. biting longitudinal ribs, as in lfijhoclus\ Kimmeridgc Cla) , 
Havre, N. Trance. I’uixhased, 1850. 
32547. Five fragments ; Kimmeridge Clay, Vaches Noircs, N. France. 
Tesson Coll. 
32771. Abraded fragment; Kimmeridge Clay, Boulogne, N. France. 
I'lirfhased, 185 1. 
P. 2211. Portion of very small spine ; Portlandian,8oleurc, Switzer- 
land. E(jerton Coll. 
P. 4183. Portion of larger spine ; Portlandian, Solourc. 
KimisJcillen Coll. 
(ii.) Cephalic Spine. 
32772. Imperfect cxserted portion of a large cephalic spine, pro- 
bably of this species ; Kimmeridge Clay, Boulogne. 
I’ur chased, 185/. 
(iii.) Dentition. 
41378. A large portion of the dentition of the (? upper) jaw, de- 
scribed by Owen {loc. cit.) under the niime of S. medius, 
and shown, of one third the natural size, in the accom- 
panying woodcut, tig. 11 ; Great Oolite, Caen, Normandy. 
I'urehased, 18611 ' 
Fig. 11. 
Dentition of Aderacanthus ornatUdmus {Slnphodus medins, Owen). 
Great Oolite, Caen, One third nat. size. (No. 41378.) 
