56 BULLETIN W, UNITED STATES NATIONAL MUSEUM. 



Tlie surface is smooth. Tlie_y are open at the root, and hollow. (PI. 38, figs. 1,2; 

 pi. 22,%. 1.) 



Doctor Manigault, curator of the Charleston Museum, wrote to Professor Cope 

 regarding these teeth, as follows: 



Another peculiarity of the head consists in the lower maxillary bones being provided each at its 

 point with a single small and very sharp tooth. These were not noticed during the dissection, owing 

 to their being too much embedded in the integuments." 



20971. Barnegat City, New Jersey. — Adult female. The teeth are slender, 

 cylindrical, and irregularly pointed at both ends. The tips siiow what appears 

 to be an inner core of dentine which has been worn down nearly to the cement coat- 

 in'T and somewhat fractured. The cement coating is several millimeters thick, 

 but does not increase the diameter of the teeth near the middle, so that they remain 

 irregularly cylindiical throughout. The surface of the cement is rough and irregular. 

 The root is short, conical, and closed at the end. These teeth are nearly straight. 

 As tliey have been extracted from the jaw and the latter is broken it is not possible 

 to distinguish which is the upper and which the lower surface, but they are irregu- 

 larly oval in section, and a little compressed. (PI. 38, figs. 3-5.) 



In my original notes on this specimen, I recorded that there was a small pair 

 of teeth behind the larger ones described above. Mention of these will be made 

 again later. (See p. 57.) 



22089. Benny Island. — Adult female (?). The teeth arc in position in this 

 specimen and are nearly horizontal in position, but a little inclined upward and 

 toward each other. They do not extend beyond the tip of the jaw nor up to the 

 level of the upper surface of the symphysis, but protrude about 13 mm. beyond 

 the alveoli on the side. They are rather slender, somewhat fusiform, blunt at both 

 ends and slightly curved upward. The surface is irregular. They are nearly 

 round in section. Tlie root is closed, and the apex shows what appears to be a 

 core of dentine surrounded by cement. There is a depression on the inner side 

 near the root. These teeth are remarkable as intermediate in form between those 

 of the preceding specimen ami those of the specimens next to be mentioned. (PI. 

 38, figs. 6, 7; pi. 22, fig. 3.) 



20993. Bering Island.— AduM male (?). (Type of Z. grehnitzJcii.) These 

 teeth arc almond-shaped ami very symmetrical. They are thickest near the base 

 and ta])cr gradually to the tip, which is cpiite acute. They are somewhat compres.sed 

 and hence elliptical in section, the vertical diameter being greater than the trans- 

 verse diameter. One side (jjrobably the inner) is flattened. They are slightly 

 curved upward toward the a])ex, which is a little worn and fractured. The root 

 is very short and conical. It is nearly clo.sed, but a very small canal extends upward 

 for about 10 mm. The surface of the tooth is quite smooth, but dull in the lowvr 

 half. The line of demarcation between cement and ilentine is not evident. (PI. 38, 

 figs. 8,9; ph 23, fig. 1.) 



21248. Bering Island. — Adult male (?). In this specimen the teeth are still 

 in the natural position in the jaw. They are held in place by ligaments and pro- 



a Proc. Acad. Nat. Sci. Phila., 1865, p. 15. 



