166 RADIATA. 



No. 834. Ananchytes ovata, Lam. 



(Var. gibba, Lam.) Interior cast, showing ambulacral lines. Price, $0.60. 



No. 835. Ananchytes ovata, Lam. 



(Elliptical variety). From the Chalk of Meudon, France, and now in the 

 Ward. Museum, University of Rochester. Price, $0.40. 



No. 836. Ananchytes ovata, Lam. 



(High variety). From the Chalk of Kent, England, and now in the Ward 

 Museum, University of Rochester. Price, $0.50. 



No. 837. Brissns cylindricus, Agass. 



(Syn. B. oblong us, Forbes). The Echini of this genus, vulgarly known under 

 the name of " Sea-eggs," were described by Aristotle. They have an oval form, 

 with the summit eccentric anteriorly. This species is peculiar to the Pleisto- 

 cene (Quaternary) at Palermo, Sicily. Price, $0.30. 



No. 838. Cardiaster bicarinatus D'Orb. 



(Syn. Holaster bicarinatus, Agass.) This large Spatangoid is from the Chalk 

 of Ciply, France. Price, $0.50. 



No. 839. Hemiaster bufo, Desor. 



(Syn. Spatangus bufo, Brongn.) A heart-shaped Echinus from the Lower 

 Chalk, Rouen, France. Price, $0.25. 



No. 840. Hemiaster CUblCUS, Desor. 



A very swollen form, and square at the extremities. From the Chalk near 

 Suez, Egypt. Price, $0.30. 



No. 841. Hemipatagus Hoffmanni, Goidf. 



This is one of the 1 argest species of this Spatangoid genus. From the 

 Pliocene Tertiary, Bunde, Westphalia. Price, $0.80. 



No. 842. Hemipneustes radiatus, Agass. 



This Spatangoid ia an inflated Urchin, as 

 high as broad, and nearly perpendicular in 

 front, where there is a deep, narrow furrow. 

 The ambulacral summit is central ; the ambu- 

 lacra are very large and winding ; the tuber- 

 cles small ; and the anus is on the posterior 

 border. From the Upper Chalk of Maest- 

 richt, Holland, and now in the Ward Museum, 

 University of Rochester. Price, f0.75- 



No. 843. Holaster latissimus, Agass. 



This Echinus is remarkable for its size. It is cordiform, with large am- 

 bulacra, a deep anterior furrow, central ambulacral summit, transversely oval 

 mouth. From the Gault (Cretaceous), France, and now in the Ward Museum, 

 University of Bochester. Price > $ 0,40, 



