EXPLANATION OF PLATES. 841 



Fig. 5. Ixodes JRicinus, p. 577, magnified after GUKLT Magazin f. d. 



gesammt. Thierheilk. ix. Tab. i. fig. 18. 

 Fig. 6. Telyphonus proscorpio LATR., p. 586, nat. size. Fig. 6 6, the 



cephalothorax from the side, to shew the lateral eyes a. 

 Fig. 7. p" t p'" t oral organs of the same arachnid ; p", upper jaws ; p" f , 



under jaws ; magnified two diameters. 

 Fig. 8. Dorsal vessel or heart of Telyphonus, with the adipose body, 



magnified. 

 Fig. 9. Nervous system of Telyphonus, magnified. 



PLATE XII. ARACHNIDS AND CRUSTACEANS. 



Fig. 1. An upper-jaw of Epeira diadema laid open, with the salivary 



duct, magnified, from TREVIRANUS Ueb. den innern JBau der 



Arachniden, Tab. n. 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,b, larger and 



anterior; c, c, smaller posterior; d, d, lateral posterior papillae, 



accessory feelers according to TREVIRANUS {palpi accessorii). 

 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. vn. PL xxvi. fig. 3. 

 Fig. 5. Anatifa Icevis, 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 STRAUS Mem. du 



Mus. v. PL XLIX. fig. 18. 

 Fig. 7. Idotea entomon, p. 654, nat. size. 

 Figs. 8 10. Portunus Moenas, p. 679, nat. size; fig. 8, from above, 



fig. 9, under surface with the tail lying on it, fig. 10, the tail 



thrown back. 



PLATE XIII. MOLLUSCS. 



Fig. 1. Chiton Cummingii. Example of a multivalve shell, p. 682 ; 



comp. p. 789. 



Figs. 2 7. Examples of bivalves, p. 682. 

 Fig. 2. Terebratula. A species from New Guinea, see p. 722. A, ventral 



shell with apex perforated ; B, dorsal shell from the inside with 



the calcareous arc. 

 Fig. 3. Shell of Avicula (Meleagrina) margaritifera, pp. 730, 731. On 



the inside are seen some pearls attached, a, impression of 



the adductor muscle. 



