444 L. Agassiz on the Echinodermata. 



cavity, to the border^of which are annexed five rough rays, simply 

 bifurcate up to their base, and pinnate. Body free. 



*S". tenella, Ag. (Comat. tenell., Gold/.) — S. pcctinata, Ag. (Comat. pec, 

 Goldf.)— S.jiliformis, Ag. (Comat. filif., Gold}.) 



5. Glenotremites, Goldf. — I can only see in this genus the disc 

 of a Crinoid nearly allied to Comatula, but not in the least a genus 

 allied to Echinus. (See also the 14th genus Solacrinus, Goldf.) 

 What distinguishes it is the having at its surface perforated impres- 

 sions which have been regarded as the points of insertion of spines, 

 but I believe them rather to be the articulated surfaces of dorsal rays, 

 while the five grooves surrounding the mouth are the points of in- 

 sertion of the rays. Five infundibuliform apertures round the mouth. 

 One fossil species from the chalk. 



Gl. paradoxus, Goldf. 



6. Ganymeda, Gray. — The same may be said of this genus as of 

 the preceding, from which it differs by the absence of the five infun- 

 dibuliform apertures round the mouth ; as also of the alternating 

 grooves. The flattened space of the summit is quadrangular. One 

 living species, of which I saw the original specimen at the British 

 Museum. 



G. pulchella, Gray. 



7. Marsupites, Mant. (Marsupium, Keen. — Marsupio-crinites, 

 De Bl.). — Disc composed of large polygonal laminse, one of which oc- 

 cupies the centre of the dorsal summit, without offering any trace of 

 a pedicel ; three series of these laminae form the sides of the disc, 

 which resembles a purse, from the borders of which proceed five rays ; 

 mouth surrounded by numerous small laminse. One fossil species 

 from the chalk. 



M. ornatus, Mant. 



It is probably in the neighbourhood of this genus that the plates 

 which have been described under the names of Asterias scutata, A. 

 stellifera, and A. tubulata, should be arranged if they belong to some 

 unknown Crinoid. 



8. Phytocrinus, De Bl. (Hibernula, Fl. — Pentacrinus, Thomps.) 

 — Pedicel round and articulated without digitation ; disc circular, 

 formed of a central piece bearing a series of simple dorsal rays, and 

 nearer to the edge a series of bifurcate and pinnate rays, beginning at 

 the fourth articulation ; the first articulations touch one another at 

 their bases. One living species.* 



Ph. europceus, De Bl. (Pent, europ., Thomps.') 



* [This has been proved by its discoverer to be the young state of Coma- 

 tula. — Edit.] 



