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GENUS VI. Echinarachnius. Circumference subpenta- 

 gonal ; the upper surface slightly raised, rather conoidally, 

 in the centre ; the under surface flat ; the areas separated 

 by ten tortuous crenated lines ; and immediately between 

 the approximating larger areas are interposed five straight 

 slightly sulcated lines, which, passing over the margin, are 

 extended to the mouth ; thus dividing the surface into five 

 equal parts. The mouth is beneath, and central ; the vent 

 square, on the upper side, close to the margin. 



The whole of the surface is marked by elegant tracings, 

 as if in ink, bearing somewhat of the appearance of a spider's 

 web. PI. ii. fig. 8. 



But one species is known, which has only been seen 

 recently, and is placed by Lamarck under his genus scutella ; 

 but the situation of the vent, decidedly on the upper surface, 

 appears to claim for it a distinct genus. 



GENUS VII. Galerites. Conoidal or subpyramidal, rising 

 from nearly a circular base, and terminating in a vertex 

 more or less obtuse ; the mouth beneath, central ; the vent 

 beneath, in or near to the margin ; the surface divided into 

 larger and smaller areas by ten pair of ambulacral lines 

 passing from the vertex to the mouth, the area in which the 

 vent is placed being the largest. PI. ii. fig. 3. 



Synon. Oonulus, Klein. Echinites, Leske. Echino- 

 conus, Breyn. 



No remains of these animals are known to exist but in a 

 mineralized state. These petrifactions have been dis- 

 tinguished by various appellations scolopendrita, bufonitce, 

 cap-stones, &c. 



Sp. 1. Gal. albogalerus, Conical; circumference sub- 

 ovate, there being a slight extension on that side in which 

 the vent is placed ; the vertex perforated with five foramina, 

 in the tips of the lesser areas ; the surface is beset with 

 minute tubercles, and the sutures connecting the assulae are 

 generally visible ; the ambulacral lines of pores are placed 



