88 



VERTEBRATA. 



No. 331. Thanmas alifer, Miinst. 



Skeleton, on slab. This Placoid lias tlie essential characters of the Squa- 

 tina, save certain modifications of the tail fins. This skeleton was found at the 

 same locality as the preceding, and is in the Museum of the University of Munich. 



Size, 21 x 9. Price, $3.00. 



No. 332. Thanmas specioSUS, Meyer. 



Skeleton, on slab. This species is also called by Meyer, Squatina speciosa. 

 From the same locality and Museum as the preceding. 



Size, 8x6. Price, $1.50. 



No. 333. Carcharias. 



Two Teeth. These teeth of a fossil Shark were found in the Chalk of 

 K.ent, England, and belong to the Ward Museum in the University of Roches- 

 ter. Price of the pair, $1.25. 



No. 334. Squala ? 



Vertebrae. These segments of the spinal column of a Shark were found 

 in the Chalk of Kent, England, and are now in the British Museum. 



Price, $2.25. 



No. 335. CochliodllS COIltortuS, Agass. 



Palatal Teeth. In this cestraciont Placoid, the large crushing dental 

 plates appear to be welded into a single mass, and are admirably adapted to 

 crack and bruise the shells of Mollusks and Crustaceans. This specimen was 

 found in the Carboniferous limestone at Bristol, England, and belongs to the Brit- 

 ish Museum. Price, $0.50. 



No. 336. Acrodus nobilis, Agass. 



Palatal Teeth. The teeth of this Placoid (allied to the Port Jackson 

 Shark), from the finely striated character and dark color of the grinding surface, 

 are called by quarrymen " fossil leeches" ; and even the savans of a century ago 

 regarded them as petrified worms. This specimen is from the Lias of Lyme- 

 Regis, England, and is now in the British Museum. Price, $1.00. 



Acrodus Anningise, Agass. 



Lower Jaw. This 

 remarkably fine specimen 

 exhibits an almost com- 

 plete series of teeth, re- 

 taining the position they 

 occupied during life. 

 There are eight transverse 

 rows on each side, with a 

 central row at the junction 

 of the two rami. The 

 teeth of the posterior row 

 are marked with the stria? characteristic of the genus. The specimen was found 

 in the Lower Lias, Lyme-Regis, England, and belongs to the Collection of E. C. 

 H. Day, F. G. S., Charmouth, England. Price, $1.50. 



