400 ECHINODERMATA. ECHINIDES. 



Gen. 9- SPATANGUS, Lam. 



Body irregular, oval or cordiform, subgibbous, furnished with 

 very small spines ; four or five unequal compartments ; mouth 

 unarmed, transverse, labiated, approaching the margin ; anus 

 lateral, opposite the mouth. 



The Spatangl and the Ananchifes are the only genera of the section which have 

 the mouth lateral ; in all the others it is central. They differ from the Echini be- 

 sides in not having a mouth armed with bony teeth. Their body is of an irregular 

 form, often gibbous, and always less deep than broad. The compartments are more 

 or less deeply marked, and to the number of four or five. They live in the sand. 



* With four compartments. 

 S. pectoralis, Lam. Shell oval-elliptic, depressed, large, with four 



compartments, the interstices elegantly granulated Seba, Mus. 



iii. pi. 14, fig. 5, 6. 



S. ventricosus, Lam. Shell ovate, gibbous ; compartments four, ob- 

 long, with impressed furrows ; larger tubercles placed in a zigzag 

 form. West. Indian seas Lam. iii. 29. 



S. purpureus, Lin. Shell heart-shaped ; compartments four, lan- 

 ceolate, plane, the larger tubercles in a zigzag form. Inhabits 

 European seas. B. Pen. Brit. Zool. iv. pi. 37- 



** With Jive compartments. 



S. canaliferus, Lam. Oblong-cordate, base behind gibbous, with 

 five impressed patulous compartments, and the fore part deeply 

 furrowed. Inhabits Indian Ocean. Rumph. Mus. pi. 14, fig. 2. 



S. arcuarius, Lam. Shell cordate, inflated, gibbous behind, with 

 five compartments, the lateral ones resembling a double arch ; 

 mouth subcentral. Inhabits American and African seas. D'Ar- 

 genv. pi. 25, fig. 1. 



Gen. 10. ANANCHYTES, Lam. 



Body irregular, oval or conoid, furnished with spiniferous tuber- 

 cles in the living state ; compartments diverging from a sim- 

 ple or double summit, and extending without interruption to 

 the margin or to the mouth ; mouth near the margin, labia- 

 ted, subtransverse ; anus lateral, opposed to the mouth 



The Ananchites much resemble the Spatangi in their lower part ; but the com- 

 partments are radiated and uninterrupted. None of the genus are known in the 

 living state. The species, which are all fossil, are found neaj Paris and in various 

 parts of France, and many have been figured by Klein. 



Gen. 11. GALERITES, Lam. 



Body elevated, conoid or almost oval ; compartments complete, 

 formed of ten furrows, which radiate in pairs from the sum- 

 mit to the base ; mouth inferior and central ; anus in the 

 margin. 



The species of this genus are all fossil. 



Gen. 12. ECHINONEUS, Lam. 

 Body ovoid or orbicular, convex, slightly depressed ; compart- 



