836 EXPLANATION OF PLATES. 



Fig. 4. Tcenia plicata, pp. 180, 181, the head and anterior part of the 

 body nat. size, after a specimen in the Rijks-Museum, Leyden. 



Fig. 5. Echinorhynchus gigas, p. 1 84 ; A, nat. size, B, head of the same 

 species magnified. After BREMSER Icones helminthum. 



Fig. 6. Tristoma granulatum, p. 186, magnified two diameters j from a 

 specimen in the Rijks-Museum, Leyden. 



Fig. 7. Ascaris leptoptera, p. 190, nat. size. A, head, B, tail, both magni- 

 fied ; after BREMSER Icones helminthum. 



Figs. 8 and 9, from EHRENBERG'S Infusions-thierchen. Fig. 8, Furcu- 

 laria gracilis, p. 204 ; fig. 9, Philodina megalotricha, p. 205 ; 

 both highly magnified. 



PLATE VI. KINGED WORMS, INSECTS. 



With the exception of fig. 3 C, all the figures are from nature and of the 

 natural size unless the contrary be expressed. 



Fig. 1. Gordius aquaticus, p. 194. 



Fig. 2. Planaria torva, p. 223, magnified two diam. B, head with two 

 eyes. 



Fig. 3. Hirudo medicinalis, p. 226. B, rings from the middle of the 

 body on the ventral surface, magnified two diameters, c, the 

 anterior part of the head, from the inferior surface with the 

 margin that surrounds the mouth. Three fissures are seen from 

 which the jaws proceed. This magnified figure is copied from 

 that of BRANDT u. RATZEBURG Mediz. Zool. n. Taf. xxvm. 

 fig. 10. 



Fig. 4. A, Serpula bicornis SAVIGNY, p. 236. B, the anterior part of the 

 inferior surface shewing the operculum. 



Fig. 5. Hermella, p. 236. A new species from the Cape of Good 

 Hope. 



Fig. 6. Lycoris, p. 241. The anterior part with proboscis exserted. 

 A new species from the Cape of Good Hope. 



Fig. 7. Polyodontes maxillosa, p. 245. A, the anterior portion with the 

 proboscis exserted, B, the proboscis on the inferior surface with 

 the four jaws. 



Fig. 8. Glomeris ovalis, Sphwropceus insignis BRANDT, p. 292. A, the 

 animal rolled together. B, the head and anterior rings from the 

 side, and c, from before ; D, antenna ; G, first pair of feet ; H, two 

 rings from the middle of the body with four pairs of feet. 

 (D H magnified). 



