82 EEVISIOX OF AMEEICAX MOLES— TRUE. vol.xix. 



TEETH. 



Dental formula: i., -|; c, \; pm., |; m., |; total, 44. 



First upper incisors large, half ovate, curved inward and touching 

 each other only at the extremities. Second incisor linear, jninute. 

 Third incisor long and slender, witli a small i)osterior basal tubercle, 

 disappearing with age. 



The canine is the smallest tooth in the row, except the second inci>or. 

 It is conical, compressed, with a small posterior basal cusp. The first, 

 second, and third premolars similar to each other in form, but succes- 

 sively larger; the first with a posterior, and the second and third with 

 both anterior and i)Osterior basal tubercles, of which the posterior is 

 the larger. Fourth premolar larger, with a small anterior basal tuber- 

 cle, a posterior trenchant margin, and a large heel or internal basal 

 cusp. Molars broad W-shaped in transverse section, with a broad 

 internal basal ledge, extending entirely across the inner side of the 

 tooth and having a tricuspidate free border. The ijoints in which the 

 lines meet to form the letter W, as well as the extremities, are elevated 

 into cusps or tubercle-like thickenings, of which the inner are much the 

 most prominent. The first molar has a small anterior basal tubercle. 

 The third is smaller than the other two and irregularly triangular, 

 lacking the portion corresponding to the posterior fourth of the second 

 molar. 



First lower incisor large, nearly spatulate in form, and inclined for- 

 ward, so as to be horizontal. Second similar in form and position, but 

 smaller. Third minute, with a sickle-shaped crown, and also inclined 

 forward. Canine long, slender, and curved, with both anterior and pos- 

 terior basal tubercles, of which the posterior is the larger. First pre- 

 molar similar to the canine, but smaller. Second, third, and fourth 

 premolars successively a little larger than the first and similar in form, 

 but with a reduced central cusp and enlarged anterior and posterior 

 basal tubercles. Between the central cusp and i)osterior tubercle and 

 somewhat internal to them is placed an additional low tubercle. ]Molars 

 compressed, W-shaped in transverse section, with cusps at the points 

 representing the intersection of the lines and arms of the letter, of 

 which cusps the external ones are much the largest and longest. The 

 central inner one is bifurcated. 



SKELETON. 



In Cuvier's Le9ons d'anatoinie comparee the vertebral formula for 

 Condylura is given as follows: 



C, 7; d., 13; 1., G; s., 5; ca., 17; total, 48. 



Bell ' gives the same formula, having perhaps copie<l it from Cuvier. 

 In two skeletons in the Museum collection I find the following: 



C, 7; d., L3; 1., G; s., 5; ca., 10; total, 50. The last caudal is rudi- 

 mentary. 



' In Todd's Cyclopedia, Article Insectivora. 



