ECHINODERMATA. 



1G7 



No. 844. Holaster subglobosus, Agass. 



This species is very nearly as convex on the under side as above. This speci- 

 men is above the ordinary size and has the apex unusually elevated. From the 

 Upper Greensand (Cretaceous), Rouen, France, and now in the Ward Museum, 

 University of Rochester. Price, $0.40. 



No. 845. Linthia crucia, Desor. 



(Syn. Brissus cruciatus, Agass.) This large cordiform Echinus, allied to 

 Periaster, has long, deep petals, the ambulacral summit slightly eccentric, and a 

 wide anterior furrow From the Miocene Tertiary, Capri, Italy. 



Size, 7x6. Price, $1.25. 

 No, 846. Macropneustes bissoides, Leske. 



This Spatangoid is nearly cylindrical, truncated behind, with large tubercles 

 irregularly distributed, and long petals. From the Nummulitic limestone (Mid- 

 dle Eocene Tertiary), Montfort, France, Price, $0.50. 



No. 847. Micraster cor-anguinum, Agass. 



This genus of Spatangidm is so termed from the 

 star-like arrangement of its four small ambulacra. 

 The test is heart-shaped, and wider before than 

 behind, with a furrow in front ; the tubercles are 

 small, and irregularly distributed ; the mouth is 

 transverse, situated anteriorly, and protected by a 

 projection of the odd inter-ambulacrum. From the 

 Chalk.Kent, England, and now in the Ward Museum, 

 University of Rochester. Price, $0.40. 



No. 848. Micraster (Epiaster) acutus, Agass. 



This Echinus is of triangular form, and has very concave petals. From the 

 Upper Greensand (Cretaceous), France. Price, $0.30. 



No. 849. Pericosmus Edwardsii, Agass. 



A Spatangoid from the Miocene Tertiary of Superga, Italy. 



Price, $0.30. 



No. 850. Schizaster ambulacrum, Agass. 



This Spatangoid is well characterized by very deep and unequal petals, and 

 eccentric summit. From the Nummulitic limestone (Middle Eocene Tertiary), 

 Biarritz, France. Price, $0.35. 



Price, $0.40. 



Price, $0.30. 



No. 851. Schizaster (Spatangus) Scillae, Desm. 



From the Miocene Tertiary of Corsica. 



No. 852. Schizaster vicinalis, Agass. 



From the same locality as the preceding. 



No. 853. Spatangus Pareti, Agass. 



This cordiform, inflated Echinus is rare. From the Miocene (?) Tertiary of 

 Italy. Price, $0.75. 



