37 
discal perforations ovate, small, the anterior smaller, the hinder largest, 
with two pairs of rather large tesserze between the ends of the ambu- 
lacra and the foramen, the upper pair subtrigonal ; 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 Echinoglyphus the tesseree of the ambulacral bands are broad 
and band-like between the ambulacra and the ambulacral slits. 
Genus Ecutnociyruvs, Van Phelsum. The Encore of Agassiz. 
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 on 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 frondosus, and La- 
marck Seutella emarginata. I am induced to believe that Scutella 
quinqueloba of Eschscholtz, Encope Valenciennesii, Encope subclausa, 
Encope oblonga, 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 Fisuaria. 
The following species is peculiar as having an oblong, longitudinal 
vent. 
1. FipuLARIA OBLONGA. 
Shell ovate, elongate, ventricose; vent oblong, longitudinal, ac- 
cording to the axis of the shell. 
Hab. N. Australia. 
Fam. 2. Eco1noLAMPID. 
Genus Ecu1noLampas. 
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. 
The other species have the anterior porous band of the anterior 
pair of ambulacra shortest ; under side rounded, convex ; mouth ob- 
long, transverse, large, marked with no tubercles, and only very rudi- 
mentary oral ambulacra. 
