288 ON A NEW BRITISH SPECIES OF SPATANGUS. 
Desc. Vertex nearly even. Oviducts approximate, with 
the punctured space behind. Vent transversely ovate. 
Enclosed space beneath cordiform, with single lateral 
pores. Primary spines supported on tubercles, with a 
central ligament, and surrounded by a moniliform 
ring. Spaces between the pairs of pores in the avenues 
rough. Colour purple. About an inch and a quarter 
in length. 
I have adopted the appellation from Leske with very 
considerable doubt. The Zetlandic species is more globu- 
lar than expressed in Leske''s figure, and the line from the 
oviducts to the mouth is flat, instead of being carinate. In 
other respects, however, there is considerable general re- 
semblance. 
The following list contains all the species of Echini which 
are known to reside in our seas : 
I. Genus, Cidaris. 
1. papillata. 
II. ' Echinus. 
2. esculent us. 
3. miliaris. 
4. subangularis. 
III. SeUTELLA. 
5. placenta. 
IV. FlBULARIA. 
6. pusilla. 
V. Spatangus. 
7. cordatus. 
8. ovatus. 
9. purpureus. 
Manse of Flisk, \ 
Feb. 6. 1824, J 
