398 SALEN1DAE. 



The resemblance of the primary spines and of the abactinal system of this 

 species to Stephanocidaris bispinosa is quite striking, and unless the speci- 

 mens are denuded it is easy to mistake the two species when covered with 

 spines and papillae ; hence the confusion which has existed regarding Cidari- 

 tes bispinosa, tubaria, and Goniocidaris Quoyi, owing to the general outward 

 resemblance of the primary spines of Goniocidaris and of Stephanocidaris. 



The median ambulacra] zone is bare; the whole median ambulacra] space 

 is sunken, and lined on both sides with irregular niiliaries, adjoining the two 

 principal rows of secondaries next to the poriferous zone. The poriferous 

 zone is broader in proportion than that of G. geranioides. 



Australia; Tasmania. 



SALENIDAE. 



Subfamily Salenidae Acass., 1838, Mon. Ech. Sale'nies. (emend.) 



Small Echini with narrow ambulacra! zones. Interambulacral tubercles 

 forming ten primary vertical rows. Abactinal system remarkable for the 

 soldering together of the anal and genital plates, the deep sutural cuts and 

 pits formed upon tin' plates of the abactinal system; structure of the spines 

 similar to that of Cidaridae. 



For further details see p. 258 of Part II., the description of the only living 

 Salenia thus far found. 



SALENIA. 



Salenia Gray, 1825, Ann. Phil. 

 (See Part II. p. 208.) 



Salenia varispina 



! Salenocidaris varispina A. Ac, 1869. Bull. M. C. Z., I. 

 I Salenia varispina A. Agass., 1872, Rev. Ech., Pt. I. p. 155. 

 (See Part II. p. 261.) 



PL Ill.f. 8-U; PL XXXV. f. 16. 



Straits of Florida. 



