EXPLANATION OF PLATES. 841 
Fig. 5. Ixodes Ricinus, p. 577, magnified after Gurir Magazin f. d. 
gesammt. Thierheilk. 1x. Tab. 1. fig. 18. 
Fig. 6. Zelyphonus proscorpio Larr., p. 586, nat. size. Fig. 6b, the 
: cephalothorax from the side, to shew the lateral eyes a. 
Fig. 7. p”, p’”, oral organs of the same arachnid; p”, upper jaws ; p’””, 
under jaws ; magnified two diameters. 
Fig. 8. Dorsal vessel or heart of Zelyphonus, with the adipose body, 
magnified. 
Fig. 9. Nervous system of Z'elyphonus, magnified. 
Puate XII. ARAcHNIDS AND CRUSTACEANS. 
Fig. 1. An upper-jaw of Hpewa diadema laid open, with the salivary 
duct, magnified, from Treviranus Ueb. den innern Baw der 
Arachniden, Tab. 11. fig. 21, see p. 560. 
Fig. 2. Spinnarets of Aranea atrox (see p. 588), magnified, after 
TREVIRANUS op. cit. Tab. v. fig. 43; a, vent; b,6, larger and 
anterior ; c, c, smaller posterior; d, d, lateral posterior papille, 
accessory feelers according to TREvVIRANUS (palpi accessorit). 
Fig. 3. Limulus moluccanus, p. 623, reduced. A female seen on the 
under surface. 
Fig. 4. Argulus foliaceus, p. 631, on the under surface, laying its eggs ; 
after JuRINE Ann. du Mus. vu. Pl. xxvi. fig. 3. 
Fig. 5. <Anatifa levis, p. 638 ; one side of the shell is removed to exhibit 
the animal in its natural position; nat. size. 
Fig. 6. Daphnia pulex, p. 641, a male, magnified after Srraus Mém. du 
; Mus. v. Pl. xurx. fig. 18. 
Fig. 7. Idotea entomon, p. 654, nat. size. 
Figs. 8—10. Portunus Menas, p. 679, nat. size; fig. 8, from above, 
fig. 9, under surface with the tail lying on it, fig. 10, the tail 
thrown back. 
Puatre XIII. Mox.uvscs. 
Fig. 1. Chiton Cummingti. Example of a multivalve shell, p. 682 ; 
comp. p. 789. 
Figs. 2—7. Examples of bivalves, p. 682. 
Fig. 2. Zerebratula. A species from New Guinea, see p.722. a, ventral 
shell with apex perforated ; B, dorsal shell from the inside with 
the calcareous are. 
Fig. 3. Shell of Avicula (Meleagrina) margaritifera, pp. 730,731. On 
the inside are seen some pearls attached. a, impression of 
the adductor muscle. 
