Dr. Henry Woodward — On a netc Loricula. 491 



The mammalian aspect of the alveolar dentition in Cynognathus may 

 have drawn attention away from the obvious resemblances between 

 the Lycosauria with prehensile molars and the Cynognathia with 

 cutting molar teeth. But the teeth upon the maxillary plate not only 

 emphasise a close affinity between these divisions of the Cynodontia, 

 but appear to indicate wider affinities of the Cynodontia with other 

 Anomodont reptilia. Thus in Pareiasaurus the palate carries parallel 

 rows of slender prehensile teeth as well as the alveolar teeth. And 

 in the Endothiodontia the palatal dentition is fully developed though 

 the alveolar teeth are absent. In all these types the palatal teeth 

 preserve their individual separation from each other, and it is only in 

 Hyperoda/pedon that any parallel is found to the way in which the 

 palatal plate is formed in Cynognathus. 



The posterior widening of the palatal armature by which the crowns 

 of the denticles become separated from each other I regard as a specific 

 character only, for in the badly preserved and crushed skull of another 

 species the posterior expansion of the dental plate appears to be absent. 

 If that specimen should eventually have the matrix removed sufficiently 

 to be figured, it will show that the posterior nares were margined 

 in this genus by broad, flattened, dental bands upon the palatine bones 

 which have the aspect of crushing teeth, wrinkled transversely in front 

 and somewhat tuberculate behind, but quite unworn, as might have 

 been anticipated. The palatine dental plates can only be uncovered 

 with the needle, and would be lost under the chisel. 



EXPLANATION OF PLATE XXIV. 



Maxillary dentition and snout-sculpture of Cynognathus crateronotus. 



Fig. 1. — ^Palatal aspect of the right maxillary bone, showing A.T., the line of 

 alveolar teeth, and the large canine tooth, all broken off in their sockets, also the 

 pit for the mandibular canine tooth in front. Internal to these teeth is the 

 smooth concave tract of the palate. P.T. indicates the long wedge of con- 

 soKdated palatal teeth, narrowing in front. The crowns of these teeth have 

 been touched with white to throw them into more distinct relief in the photo- 

 graph. E.S. is the empty socket from which a tooth appears to have been lost. 



Fig. 2. — External surface of the anterior half of the maxiUary bone, showing the 



pitted and vascular sculpture. The notch in front indicates the back of the 



narine. Above is the line of suture with the nasal bone. The base of 



the canine tooth is visible on the convex middle part of the alveolar border. 



The figures are of natural size. 



III. On a lAEGE CiREIPEDE BELONGING TO THE GENUS LoRICULA, FROM 



THE Middle Chalk (Tukonian), Cuxton, near Rochester, Kent. 

 By Henry Woodw^ard, LL.D., F.R.S., F.G.S., V.P.Z.S. 



MORE than sixty years ago Mr. G. B. Sowerby, jun., described and 

 figured a unique specimen of a remarkable fossil Cirripede from 

 the Chalk of Kent which he named Loricula pulchella.^ It was 

 obtained by Mr. jS". T. "Wetherell, E.Gr.S., of Highgate, and was 

 subsequently acquired with that gentleman's collection by the British 

 Museum (Natural History). Mr. "Wetherell's Loricula was again 



1 G. B. Sowerby, jun. : Ann. Nat. Hist., 1843, vol. xii, p. 260. 



