62 
CATALOGUE OF ECHINIDA. 
with only a single pair of pores ; ocellar pores anterior, and 
more visible than the posterior ovarial pores. 
Knorr . Belie. 96, t. d. Ill, f. 3. 
2 Spatangus lacunosus, Leske a Klein , t. 24, f. a. b. 
Echinospatangus ovatus, Muller. 
Spatangus atropos, Lamk. Hist. iii. 327 ; {E.M. 1. 155, f. 9, 11 ;) 
Beslong. E. M. ii. 688 ; Blainv. Zooph. 202 ; Besmoul. Echin. 
384. 
Echinocardium atropos, Gray, Ann. Phil. 1825, 8. 
Schizaster atropos, Agassiz , Prod. 185 ; Agassiz & Besor , viii. 
22, vi. 1. 16, f. 10. 
Hab. South Carolina. 
0 , b, c. With some spines. Texas. Presented by Dr. A. 
Gould. 
E. Anterior lateral ambulacra elongate , linear , continued to the 
margin , rudimentary ; hinder short , petaloid, sunken , per- 
fect. Intermediate between Spatangidse and the fossil Anachi- 
tidrn. 
15. Agassizia. 
Shell ovoid, very thin ; ambulacra radiating ; anterior lateral 
pair very long, linear, and only formed of two rows of pores ; 
the hinder pair short, ovate, with four series of perforations, 
surrounded by a very flexuous peripetalous fasciole, and accom- 
panied by a posterior fasciole, which passes under the vent, as 
in Schizaster ; lower side convex ; plastron distinct ; vent in 
upper part of high hinder end, oblong, transverse ; ovarial pores 
very close together ; the madreporiform plate with an internal 
tube, directed obliquely back towards the vent. 
Agassizia, Valenc. Yoy. Venus , %ool . ; Agassiz § Besor , Ann. 
Sci. Nat. series 3, viii. 1847, 20. 
1.. Agassizia scrobiculata. 
Ovate ; back gibbous ; sides subtubercular ; anterior late- 
ral ambulacra rather rudimentary, with one or two rows of 
pores ; posterior short, sunken ; vent surrounded with a series 
of rather distant tubercles. 
Agassizia scrobiculata, Valenc. Voy. Venus, Zool. t. 1, f. 2 ; 
Agassiz Besor, 1. c. 20. 
Hab. Peru. 
