The Mammoth Teeth from the Aniwa Bay in Saghalien

Abstract

In July and September, 1934, two fossil mammoth teeth were found out at the northern part of the Aniwa Bay in Saghalien, by Mr., Y., Suzuki and Mr., T., Kaga respectively; both of them are now kept in the Odomari Middle School., According to Prof., Hikoshichiro MATSUMOTO's determination, they belong to the following two species., 1., Parelephas armeniacus (FALCONER); left M^-₃ This was dredged out in September, 1934, from the bottom of the sea, 7-8 fathoms deep, off Funamicho, Odomari., This specimen, which is strongly worn, consists of 21 ridges in the present condition, and measures 290 mm in length as preserved, 77 mm in the maximum width at the eleventh ridge, 113 mm in the greatest height of the crown at the seventeenth ridge., In a lateral view, the ridges in the posterior half are slightly curved and the breadth of the ridge is narrower than the valley between them., The frequency of the ridge in a length of 100 mm is 7-8 on the inner side, 8-10 on the outer side, and 9-10 on the grinding surface., The grinding surface is elogatedly elliptical, more or less curved as a whole and almost even longitudinally., the disks of the ridges are so greatly elongated that the brims of them, i., e., the layers of enamel which measure 2., 6 mm in thickness, look almost parallel with each other., 2., Mammonteus primigenius (BLUMERBACH); left M^-₃ In July, 1934, this specimen was dredged out lying 17 or 18 fathoms deep off Fukamimura, Odomari Ditrict., It is strongly worn and consists of 21 redges in the present condition., Its length as preserved is 265 mm, its maximum width 78 mm at the tenth ridge, and its greatest height of the crown is 91 mm at the fifteenth ridge on the outer side., The ridges in the posterior half are slightly curved and the breadth of the ridges are wider than the valleys lying between them., The frequency of the ridges in a length of 100 mm is 8-9 on the inner side, 10-12 on the outer side, and 10-12 on the grinding surface., The grinding surface is elongatedly elliptical and slight ly concave longitudinally, so as to sink some 9 mm at the ninth ridges., The disks of the ridges are very similar to those of the specimen of the preceding species.,