The Dental cosmos . an illustration from a communica-tion by Professor Kitt of Munich onAnomalieen der Zahne unserer Haus-tiere, (Verhandl. der Deutschen Odon-tologischen Gesellschaft, Bd. iii, S. 109). We see here the lower front teeth of ahorse, with extensive abrasions entailingan almost total loss of the enamel of thelabial surface. It is well known thatthese defects are the result of a habit ofsome horses called in Germany Krippen-iceizer (crib-whetters), of rubbing theirteeth on the edge of the manger, or oniron bars, or whatever of this nature theymay reach. The action is quite differen
The Dental cosmos . an illustration from a communica-tion by Professor Kitt of Munich onAnomalieen der Zahne unserer Haus-tiere, (Verhandl. der Deutschen Odon-tologischen Gesellschaft, Bd. iii, S. 109). We see here the lower front teeth of ahorse, with extensive abrasions entailingan almost total loss of the enamel of thelabial surface. It is well known thatthese defects are the result of a habit ofsome horses called in Germany Krippen-iceizer (crib-whetters), of rubbing theirteeth on the edge of the manger, or oniron bars, or whatever of this nature theymay reach. The action is quite differentfrom that of the cribbers or crib-bitersthat grasp the object between the cuttingedges of the teeth. I am indebted to Dr. Rygge of Chris-tiania for some twenty teeth of Globi-cephalus globieeps, a species of dolphinknown as the Grindwal, which attains a length of 6 or 7 meters and has 8 to 12conical and mostly more or less curvedteeth on each side of the jaw above andbelow. A number of the teeth sent me by Fig. Defect of the labial surfaces of the lowerincisors of a horse, resembling wasting, pro-duced by the habit designated as cribbingor -whetting. (After Kitt.) Dr. Rygge have beautiful smooth defects(Fig. 4) which are very puzzling untilone has examined the manner of artic-ulation of the teeth of this group of ce-tacea. It will then be plain to us thatsuch defects are nothing but facets wornby the friction of the teeth with theirantagonists. In Globicephalus the teethare implanted in alveoli and the distancebetween any two teeth is about equal tothe largest diameter of the correspondingantagonist. In the upper jaw they standalmost vertically; in the lower jaw theybecome more and more supined from theback to the front of the row, until theforemost teeth stand out almost horizon-tally and the upper teeth close down be-tween them. The position and shape ofthe facets will accordingly depend some-what upon the position of the teeth—inthe front or back of the jaw. Professor
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