294 REFERENCE TO PLATES, 



PAGE. 



Westerniensis (Octopus), Quoy. Fer. et Orb. Ceph., t. 10, f. 3. = O. 

 superciliosus, Quoy. 



Xiphoteuthis, Huxley 108, 202 



Zygaena (Loligopsis), Verany. Ceph. ex Sicil., t. 1, f. 2. Ceph. 

 Medit., 125, t. 40, f. c. 1852 164 



REFERENCE TO PLATES. 



Frontispiece. 



Upper. The colossal Poulpe. Denys Montfort, Hist. Nat. des Mol- 



lusques 86 



Lower. The six-armed Calamary. Montfort, 1. c 90 



Plate 1. 



1. Sepia officinalis. Keferstein, Bronn's Klassen und Ordnungen 



des Thierreichs, t. 116, f . 1 7 



d. Dorsal cartilage, p n. Fin cartilage, d'. Posterior ex- 

 tension of dorsal cartilage, c h. Shell. 



2. Sepioteutis Blainvilleanus. Keferstein, 1. c., t. 117, f. 3 7 



a. Subocular fold. J. Siphon, c h s. Cartilaginous button ; 

 n c h. Neck- plate, c h i. Anterior end of pen. 



3. Cephalic cartilage of Sepia officinalis. Keferstein, 1. c., t. 115, 



f. 4 7 



4. Neck cartilage of Sepia officinalis. Dorsal face. Keferstein, 1. c., 



t. 115, f . 5 7 



5. Neck cartilage of Loligo vulgaris. Dorsal face. Keferstein, 1. c., 



f . 6 7 



6. Cartilaginous shell of Cirroteuthis Mulleri. Keferstein, 1. c.. t. 



126, f . 6 7 



7. Chalky scales from the skin of Scseurgus titanops, greatly mag- 



nified. Troschel, Archiv fur Naturg., t. 4, f. 5, 1857 127 



Plate 2. 



1. Nervous system of Nautilus Pompilius. Owen, Memoir on Pearly 



Nautilus 32 



a. The cut surfaces of the hood. b. The open ends of the 

 digitations. c. Four of the digital tentacles exposed by laying 

 open the canals in which they are lodged, d. Anterior oph- 

 thalmic tentacles similarly exposed at their origins, e. The 

 left external labial process (the corresponding one on the right 

 side has been removed). /. The internal labial processes. 

 f/. Olfactory laminae.- 7^. The external labial tentacles of the 

 left side, with their origins exposed by laying open the canals 

 at the anterior part of the process in which they are lodged. 

 i. The internal labial tentacles of the left side similarly ex- 

 posed, i'. The internal labial tentacles of the right side. 



