40 
CATALOGUE OF ECHINIDA. 
peripetalous and subainal fascioles are often found in the same 
genus. 
Synopsis of the Genera. 
I. Pore of the inner part of the lateral ambulacra obliterated, 
a. Ambulacra flat , elongated , star-like. 
1. Echinocardium ; internal, subanal, and peripetalous fasciola 
distinct ; back with small subanal tubercles. 
2. Lovenia ; internal and subanal fasciole distinct ; peripetalous 
fasciole none ; back with large sunken tubercles. 
3. Breynia ; internal, subanal, and peripetalous fasciole dis- 
tinct ; back with large sunken tubercles. 
4. Spatangus ; internal fasciole and peripetalous fasciole none ; 
subanal distinct ; back with large sunken tubercles. 
b. Ambulacra sunken , short, definite ; internal fasciole none. 
5. Kleinia. 
II. Ambulacra complete to the vertex ; peripetalous fasciole dis- 
tinct ; internal fasciole none. 
c. Lateral ambulacra petaloid, similar, generally sunken ; lateral 
fasciole none. 
* Subanal fasciole ring -like. 
6. Eupatagus ; back with larger scattered tubercles ; subanal 
fasciole cordate ; ambulacra broad, ovate, shallow. 
7. Plagionotus ; back with larger scattered tubercles ; ambu- 
lacra elongate, deep ; subanal fasciole cordate, radiately 
grooved. 
8. Brissus ; back with nearly equal small tubercles ; subanal 
fasciole near vent. 
9. Brissiopsis ; back with nearly equal small tubercles ; sub- 
anal fasciole far below vent. 
** Subanal fasciole imperfect, crescent-like. 
10. Meoma ; back with nearly equal small tubercles. 
