All the 
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| 
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or 
Fig. 7. 
Fig. 8. 
EXPLANATION OF PLATES. 835 
granules are seen ; a, @, filaments. B, cell a more highly magni- 
fied, with the filament everted; c, filament lying in the cell 
rolled in a spiral. 
Puate LV. Ecuinoperms. 
figures of this plate are taken from specimens in the Rijks- 
Museum of Nat. History at Leyden. 
Ophiolepis imbricata Mur. et Troscu., p. 147, 11 the nat. size, 
seen from the under surface. To save space, the basal pieces 
alone of four of the arms are delineated ; a, a, fissures near the 
arms. 
Under surface of a ray from a Japanese species of Astropecten, 
p- 148, nat. size. Two rows of tentacula are seen here. 
Oreaster hiuleus Mustt. et Troscu., p. 149, seen from above, of 
nat. size; the left side is in great part removed. a, anus; 6 
Madrepore-plate (verruca dorsi); compare p. 148. 
A ray of the same ‘species opened. a, Sand-canal or stone 
canal; see p, 148. 
Under surface of part of a ray of Asterias (Asteracanthion) 
rubens, p. 149, nat. size. Four rows of tentacles are seen; 
? 
see p. 149. 
Spatangus purpureus, p. 152, seen from above, reduced one half. 
There are four apertures of the genital organs (ovaria and testes) 
and four circumscribed ambulacra. 
Cidaris imperialis Lam., p. 156, after a specimen from the Red 
Sea. The spines have been removed in order that the form of 
the shell and the tubercles on which these spines are implanted 
might be shewn. There are five sexual apertures round the 
vent, on the same number of small pentangular plates of which 
the hindmost is the largest : between them are the five eye- 
plates. The ambulacra here run quite through. Compare pp.150, 
151. 
A spine of Cidarites glandiferus, or so-named pierre judaique, 
fossil from the Jura formation, 
Puate V. Fig. 1, Ecutnoprrms ; figs. 2—7, InrestiNAL Worms ; 
figs. 8, 9, Rovirers. 
Sipunculus nudus, p. 160, after GruBE in MuEtter’s Archiv. 
Cenurus cerebralis, p. 182, after Bremser Jcones helminth. A 
part of the common bladder, with two worms highly magnified. 
Cysticercus longicollis, p. 182, magnified ; after the same, ibid. 
53—2 
