362 



HANDBOOK OF INVERTEBRATE ZOOLOGY. 



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

 the anterior venae cavte (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-cavil v. 



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. /. Neck cartilage, m. Mantle, n. Pen and pen 

 sac. 



