414 INSECTIVORES. 



of which must be regarded, by the analogy of the Chrysochlore, 

 as incisors : the next tooth might pass for a canine ; and the re- 

 maining three for premolars, of which the last is the largest and has 

 a trihedral pointed crown : the true molars have large crowns, each 

 with six cusps, four on the outer and two on the inner part of the 

 grinding surface. In the lower jaw, the first incisor is small and 

 procumbent, and the second large and laniariform, as in the Chryso- 

 chlore ; the third is absent, and a vacant space separates the incisor 

 from the three premolars, the crown of each true molar consists of 

 two parallel three-sided prisms, each terminated by three cusps, and 

 having one of the angles turned outwards and one of the faces 

 inwards : the interspace between the angles makes the outer surface 

 of the long molars of the Scalops appear grooved. The dental for- 

 mula of this genus, according to the above description, is : 



3—3 1—1 3—3 3—3 nn 



m — , c. — , pm. — , m. — ob. 



2—2' 0— O' ^ 3—3' 3—3 



The dentition of the common Mole ('Talpa euroyceaj ,{\) includes 

 eleven teeth on each side of both upper and lower jaws. The first 

 three in the upper jaw are very small, with simple incisive crowns, 

 and are each implanted by a long and slender fang : these teeth, by 

 analogy with the Chrysochlore, and by the position of the incisive 

 foramen, must be regarded as incisors : the next tooth, by the size 

 and shape of the crown, represents a canine, but it is implanted by 

 two fangs like the three succeeding premolar teeth, and these teeth 

 are of small size with compressed conical crowns ; the fourth premo- 

 lar has a larger three-sided conical crown, supported by three fangs : 

 the crowns of the true molars are multicuspid, the middle one is 

 the largest with five points and is usually supported by four fangs, 

 the hindmost is the smallest, with a tricuspid crown and three fangs. 

 In the lower jaw, the first four teeth on each side are small, simple 

 and single-fanged, like the three incisors above : the fifth tooth has 

 a large laniariform crown, supported by two fangs, being very similar 

 to, but shorter than, the two-fanged canine above ; but, as it passes 

 behind that tooth when the mouth is shut, we must regard the fourth 

 tooth below, notwithstanding its small size and similarity to the 



(1) PI. 110, fig. 3. 



