XVI EXPLANATION OF THE PLATES. 



Page 



i. i. The right hand margin of the mantle. 

 k. The male organ. 

 /. /. The foot. 

 FIG. 2. lanthina 291 



a. The mouth, composed of two vertical cartila- 

 ginous lips, minutely toothed at the margin. 



b. The shell. 



c. The air-vesicles forming an out-rigger. 



PLATE VII. CEPHALOPODS. 



FIG. 1. Loligo cardioptera. 



2. Spirulea prototypus 316 



a. The shell. 



3. Ocypus unguiculatus. 1 308 



a. The suckers. 



b. The arms. 



PLATE VIII. ANNELIDANS. 



FIG. 1 . Peripatus Juliformis 347 



2. Anterior extremity of do. 



a. Mouth. 



b. b. Eyes. 



c. c. First pair of legs. 



3. Bdella nilotica 336 



a. Anterior sucker. 



b. Posterior do. 



c. Reproductive organs. 



4. Lycoris agyptia 347 



1 Referred to by mistake as au Octopus t 308. 



