NO. 1101. 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



47 



Dimensions of skulls of Scalops aquaticus texanus. 



Catalogue 

 Dumber. 



43208 31403 



43209 31404 



31402 

 31664 

 5766 

 5768 



43267 

 43534 

 4485 

 4487 

 51408 

 5i:iS6 

 51385 

 51387 

 4489 

 4486 

 4490 

 4488 

 51388 

 5043 



5044, 4324 

 5042 1 4322 



30913 23494 



2740 3488 



5770 

 57671 

 5771 



Collection. 



Dept. Agric. 



do .;.... 



-do 



....do 



Amer. Mus . 



do , 



Dept. Agric. 



do 



do 



....do 



Amer. Mus . 



do 



do , 



do 



Dept. Agric. 

 Merriam 



do 



do 



Dept. Agric. 

 Amer. Mus . 



Locality. 



Padre Islaud, Tex.. 

 do 



Kear Santa Rosa, 

 Cameron County, 

 Tex. 



Corpus Christi, Tex. 

 do 



Kockport, Tex 



do 



do 



do . 



do 



do 



do 



do 



do 



... .do 



San Antonio, Tex. . . 



Mason, Tex 



do 



do 



Fort Keno, Okla . . 

 Aransas County, 

 Tex. ( ?) 



mm 

 32.0 

 31.4 



32.5 

 33.1 

 32.4 

 32.0 

 31.6 

 31.3 

 31.2 

 30.7 

 30. G 

 30.2 

 30.0 

 29.5 

 30.5 

 31.1 



33.3 

 33.3 



mm. mm. 

 26.8 14.0 



26.5 

 27.0 

 27.1 

 26.0 

 26.0 

 25.6 

 25.4 

 24.9 

 25.0 



14.4 

 13.9 

 14.3 



a nB 



17.4 15.1 9.7! 3.7 Adult. 

 17.6 15.3, 10. Oj 4.0 Adult, or 



I le.ss. 

 16.6 ! Adult. 



17.5 

 17.5 

 17.5 

 17.4 

 16.8 



24. 7' 

 24. 2 



13.61 16.7 

 13. 8| 17.0 

 13.6 16.2 

 16.6 

 16.4 

 16.4 

 16.0 



13.0 

 12.8 



25.6 13.2 



16.5 



15.3 

 15.2 



15.01 

 15.5 

 14.7 

 14.9 

 14.1 

 15.0 



27.6 14.4! 17.8 15.4 

 27. 0! 14.1 17.5 15.9 



9.4 

 9.3 



8.7 

 9.3 

 9.7 

 8.7 

 8.5 

 8.4 

 9.0 

 8.7 



27.4' 14.2 



1*14.8 



17.2 15.5 



9.8 



9.8 



9.3 

 10.0 



4.0 

 4.3 



4.0 

 4.0 

 4.3 



3.9 

 3.7 

 4.2 

 3.7 

 3.8 

 3.4 



3.4 

 3.3 



Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Adult, o r 

 less. 



"I m m a- 



ture." 

 Young. 

 Type, old. 



' Tooth row. 



Genus SCAPANUS, Pomel. 



Scapanus, Pomel, Arcliiv. Sci. I'bys. and Nat., IX, 1848, p. 247. 

 lownsendi and S. breweri, Bachman.) 



(Based on Scalops 



Body fusiform, depressed. Feet fossorial. Manus very broad, witli 

 large os falciforme ; palms turned outward; toes not webbed. Muzzle 

 produced; nostrils superior. Tail short, tbiclc, terete, scaly, sparsely 

 clothed with long hair. Auricular orifice and eyes minute. 



Skull depressed; tympanic bnlhc comi)lete; anterior nares somewhat 

 inclined upward. Palate only slightly ])rolonged behind the last molar. 

 First upper incisors large. Internal basal cusp of molars narrow and 

 simple. 



Pelvis with two osseous bridges connecting the sacral vertebra' with 

 the ischium. 



Dental formula: i, f : c, ]-; pni, }; m, f ; total, 44. 



This genus is very closely allied to Scalops^ from which it differs 

 chiefly in the number and relative size of the teeth. In Scalops the 

 third lower incisor and the lower canine are wanting in the functional 

 dentition and the premolars are but three above and below, while in 

 Scapanus the incisor and canine are present and also four premolars. 



