FROM THE PHOSPHATE BEDS OF SOUTH CAROLINA. 257 



The pharyngeal bone with its imbedded mass of teeth, reminding one of a 

 fused mass of discolored beads such as one occasionally meets with from some 

 burned-down house, is in the shape of a broad triangle with the apex in front and 

 the thickened base directed backward. Prof. Cocchi describes the corresponding 

 bone in a reversed direction from that here given, and which appears to me to 

 correspond with that of the position of the inferior pharyngeal in the Wrasse and 

 the Tautog. 



Figure 20 represents another specimen from a smaller individual if not another 

 species. The posterior teeth are much more numerous in the same extent of space 

 than in the preceding specimen, but perhaps this difference would be dependent 

 on difference of age. 



Figure 21 represents a superior pharyngeal with its closely impacted teeth. 

 The form of the horizontal section is half crescentic devoid of the point. The 

 larger teeth are internally situated, and the greater number appear on the hinder 

 surface. In the latter position most of the teeth are arranged with more regu- 

 larity than on the lower surface, or. on either masticating surface of the upper 

 pharyngeal. 



Prof. Cocchi in his monograph describes no maxillaries referable to Pharyngo- 

 dopilus. Several specimens from the Ashley phosphate beds I have supposed to 

 pertain to the same labroid fish as the pharyngeals above described. 



Figure 22 represents a mutilated maxillary with the lower portion retaining 

 the remains of a dental armature. This on the outer surface presents a tessellated 

 appearance as in the Parrot fishes, due to a number of small denticles arranged 

 quincuncially and decreasing in size outwardly. At the margin of the jaw the 

 denticles form a row of compressed ovoid points adapted to biting. Along the 

 symphysial margin of the jaw there is a single longitudinal row of five conical 

 teeth with an additional pit in advance from which a tooth has been shed. The 

 two teeth in front are double the size of the others. 



Figure 23 represents the dental armature of a mandible, with the outer face 

 covered with denticles in quincunx arrangement as in the Parrot fishes. At the 

 biting margin of the jaw a row of denticles forms a serrated edge of compressed 

 ovoid points. Along the symphysial margin internally there is a single horizontal 

 row of four short conical teeth. 



Figure 24 represents another specimen in which the denticles on the outer 

 face of the jaw are more widely separated by intervening cementum. The inner 

 part of the jaw is not so deep or appears less excavated than in the former, and 

 along the symphysial border there is a horizontal row of five teeth. 



