Zoological Society. 447 



of the ambulacral perforations ; vent near the mouth, in front of the 

 anal perforation, with a group of three or four larger spines between 

 it and the mouth. 



1. Leodia Richardsonii. 



Body suborbicular, slightly depressed, five-lobed, hinder edge trans- 

 verse ; ambulacra lanceolate, not reaching to the discal perforations ; 

 discal perforations ovate, small, the anterior smaller, the hinder largest, 

 with two pairs of rather large tesserae between the ends of the ambu- 

 lacra and the foramen, the upper pair sub trigonal ; oral grooves simply 

 forked near the edge. 



Hab. West Indies. 



The single specimen I have seen of this species was presented by 

 Sir John Richardson. It is rather deformed and sinuous on the right 

 side, the hinder lateral perforation being nearly obliterated on that side. 



In Echirioglyphvs the tesserae of the ambulacral bands are broad 

 and band-like between the ambulacra and the ambulacral shts. 



Genus Echinoglyphus, Van Phelsum. The Encope of AgassLz. 

 The large Brazilian species of this genus appear to be very va- 

 riable. The young specimens have large notches on the edge of the 

 shell, and as the animal increases in size, the marginal edges of these 

 notches more or less approximate together, and sometimes even be- 

 come united, so as to transform the notch into a perforation, M. 

 Agassiz (m these variations has formed several species ; but the 

 Museum series, from the Brazils and other parts of the east coast of 

 Tropical America, show that they are all mere variations of the spe- 

 cies which Van Phelsum called Echinoglyphus frondosiis, and La- 

 marck Scutella emaryinata. I am induced to believe that Seutella 

 quinqueloha of Eschscholtz, Encope Valencienjiesii, Encope subclausa, 

 Encope oLlonya, and Encope Michelini, are only varieties of this spe- 

 cies : they are all remarkable for the large size and longly-rayed star- 

 like form of the madreporiform plate. 



Genus Fibularia. 



The following species is peculiar as having an oblong, longitudinal 

 vent. 



1. Fibularia oblonga. 



Shell ovate, elongate, ventricose ; vent oblong, longitudinal, ac- 

 cording to the axis of the shell. 

 Hab. N. Australia. 



Fam. 2. Echinolampid^. 

 Genus Echinolampas. 



The species of this genus may be divided into two sections, accord- 

 ing to the form of the ambulacra. 



Echinolampas oviformis and its allies have the porous bands of the 

 anterior and other pair of ambulacra equal ; the lower side of the 

 shell flat ; the mouth oblong, transverse, with (5) tubercles between 

 the oral ambulacra. 



