86 



VEKTEBKATA. 



No. 321. Microdon (Pycnodus) notabilis, Manst 



Skeleton, on slab. From the same locality and Museum as the preceding. 



Size, 11x5. Price, $2.00. 



No. 322. Microdon (Pyenodus) notabilis, Miinst. 



Palatal Teeth, on slab. From the same locality and Museum as the pre- 

 ceding. Price, $0.50. 



No. 323. Pycnodns platessns, Agass. 



Skeleton, on slab. This homocercal Ganoid was a deep-bodied Fish, char- 

 acterized by large, round, flat-crowned teeth, covering the broad jaws as by a 

 pavement of several rows. The profile of the head is nearly vertical. The pos- 

 terior part of the body is slender in comparison with the anterior part. This 

 complete skeleton was found in the Eocene limestone of Monte Bolca, Lombardy, 

 and is in the Museum of the University of Munich. Size, 13 x 6. Price, $2.25. 



No. 324. Gyrodus circularis, Agass. 



Skeleton, on 

 slab. This Fish has 

 the exterior form of 

 Pycnodus ,and is also 

 a Ganoid. The anal 

 and dorsal fins are 

 sustained by long 

 rays in front, and 

 diminish rapidly ; 

 the caudal is deep- 

 ly notched. The 

 teeth are elliptical, 

 and are characteriz- 

 ed by a groove running round the summit. This fine specimen, from the Litho- 

 graphic slates of Solenhofen, Bavaria, is in the Museum of the Universitv of 

 Munich. Size, 2 ft. 6 in. x 1 ft. 5 in. Price, $6.00. 



No. 325. G-yrodus hexagonus, Wagn. 



Skeleton, on slab. This species is called Microdon liexagonus by Agassiz. 

 The specimen is from the same locality and Museum as the preceding. 



Size, 8x7. Price, $1.75. 



No. 326. Gyrodns umbilicus, Agass. 



Palatal Teeth, on slab. This species is 

 characterized by a depression in the middle of 

 the teeth. This fine series of palatal teeth was 

 found in the Upper Oolite at Durrheim, Grand 

 Duchy of Baden, and is in the same Museum as 

 the preceding. p r i cej |i.Q0. 



