160 RADIATA. 



No. 776. Hemicidaris intermedia, Fleming. 



This large, depressed genus belongs to the Cida- 

 ridce with narrow ambidacra. The distinctive fea- 

 ture is the existence of small tubercles on the lower 

 half of the ambulacra. The spines are cylindrical 

 and finely striated. From the Oolite of Calne 

 (Wiltshire), England, and now in the private Geologi- 

 cal Cabinet of Mr. Ward, Eochester. Price, $ 0.30. 



No. 777. Hemicidaris crexrularis, Agass. 



With spines, on slab. This species is probably identical with the preceding 

 one. From the Coral Rag (Middle Oolite), Rochelle, France. 



Size, 6x4. Price, $0.75. 



No. 778. Hemicidaris Boloniensis, Cott. 



From the Kimmeridge Clay (Upper Oolite), Boulogne-sur-mer, France. Now 

 in the Ward Museum of the University of Rochester. Price, $0.30. 



No. 779. Hemicidaris diademata, Agass. 



From the Coral Rag (Middle Oolite), Nattheim, Wirtemberg. Price, $0.40. 



No. 780. Hemicidaris mammosa, Agass. 



This form is remarkable for its narrow, wavy ambulacra, and large tubercles. 

 From the Coral Rag (Middle Oolite), Rochelle, France. Price, $0.25. 



No. 781. Palaechirms (Melonites) multipora, Norwood and Owen. 



Group, on slab. This gigantic Echinoderm — some specimens measuring five 

 and a half inches in vertical diameter and four transversely, — has an ovoid form, 

 central mouth and anus, ten areas, interambulacral plates mostly hexagonal, and 

 the ambulacral plates hexagonal and rhomboidal. The ranges of plates number 

 65 ; and each plate is perforated by two holes. From the St. Louis limestone 

 (Sub-carboniferous), St. Louis, Mo. Size, 12 x 12. Price, $1.50. 



No. 782. PalsechillUS (Melonites) multipora, Norwood and Owen. 

 Group, on slab. From the same locality as the preceding. 



Size, 12 x 7. Price, $1.25. 



No. 783. Psammechinus monilis, Munst. 



SlbSMfla This small Cidarite with wide ambulacra is from the Miocene 



Tertiary of France. Price, $0.15. 



No. 784. Pseudodiadema hemisphaericum, Agass. 



A Cidarite with broad ambulacra. From the Coral Rag (Middle Oolite), Cal- 

 vados, France. Now in the private Geological Cabinet of Mr. Ward, Rochester. 



Price, $0.30. 



