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HANDBOOK OF INVERTEBRATE ZOOLOGY. 



6. Between the siphon and the brain the cut sections of 

 the anterior venas cavae (d). 



f. In a section through the base of the head (Fig. 190) 

 notice : — 



1. The mantle (m) separated from the head and siphon 

 by the mantle-cavity. 



Fig. 190. 



Fig. 190. — Transverse section through base of head of young speci- 

 men of Loligo Pealii; magnified twenty diameters. (Drawn from nature 

 by W. K. Brooks.) 



a. Retractor muscle of head. c. (Esophagus, d. Visceral ganglion, 

 e. Ear capsule. /. Siphon, g. Cephalic cartilage, h. Siphonal cartilage. 

 i. Mantle cartilage. I. Neck cartilage, m. Mantle, n. Pen and pen 



I 



