The anatomy of a pteropod, Corolla (Cymbuliopsis) spectabilis Dall. 79 



Explanation of the Plate. 



Plate 5. 



Reference Letters. 



6, &i anterior and posterior buccal o otocyst 



nerves p pedal ganglion 



C cerebral ganglion j?^, 'p\ p^ pedal nerves 



C^, c^ cerebral nerves pi pleural ganglion 



d anterior pedal commissure v visceral ganglion 



m, m^ posterior and anterior pedal t?^, v* right and left palliai nerves 



loop v^ , v^ right and left visceral nerves. 



rig. 1. Corolla spectahilis, dorsal view. 1:1. 



Fig. 2. Same individual, ventral view. 1:1. 



Fig. 3. Innervation of the lip. Cerebral ganglia unshaded, pedal 

 stippled. 



Fig. ,4. Central nervous system seen from right side. 



Fig. 5. Central nervous system seen from ventral side. 



Fig. 6. Figure to illustrate the nervous and circulatory (stippled) 

 systems of the fin. 



Fig. 7. Longitudinal section through entire animal , somewhat 

 diagrammatic, ca casque, f fin, p. g palliai gland, pr proboscis ; the 

 oesophagus, central nervous system and visceral mass are also shown. 

 An arrow indicates the opening into the mantle cavity whose bounding 

 wall has shrunken away from the interior of the casque. 



Fig. 8. Somewhat diagrammatic figure to illustrate the course of 

 the alimentary canal, a anus, a. r accessory reproductive organs, b. d bile 

 duct, V visceral nerve on each side of which are branches of the 

 posterior buccal nerves. 



Fig. 9. Distribution of palliai and median visceral nerves. Left 

 palliai (v'^) supplies the entire left half of the casque, while the right 

 visceral (v*) innervates the osphradium (os) and the anterior right half 

 of the shell. The posterior half is supplied by the median visceral 

 nerve (v). The mnscle bands of the proboscis and the semicircular 

 band at the junction of the proboscis and shell are also shown. 



