e 
6. 
10. 
Tb 
Hoyr, — Cephalopoda. 
PLATE 9. 
Pterygioteuthis giardi. 
Ventral aspect of the animal, after the mantle-cavity has been opened, showing 
the position of the luminous organs ; X 5. 
S., S., Siphonal organs; B., B., Branchial organs; A!, 42, Abdominal 
organs. 
Axial section of one of the larger ocular organs; X 77. 
a. c., anterior cap; a. co., axial cone; c., capsule ; c. s., central scales; 7. c., 
inner cone; n., nerve; p. c., posterior cup; s. k., spheroidal knob. 
Section through several scales from the inner layers of the posterior cup; 
X 420. 
Surface view of two scales from the posterior cup; X 125. 
n., nerve. 
View of the right siphonal organ; X 10. 
Section of a siphonal organ; X 88. 
a. c., posterior layer; and a. c.!, anterior layer of anterior cap; c., capsule ; 
c. m., central mass; co., collar; i. c., inner cone; p. c., posterior cup. 
Scales from the deeper layer of the anterior cap; X 250, 
A somewhat oblique section through one of the siphonal organs, showing the 
concentric layers of scales composing the posterior cap; X 180, 
Antero-posterior section of one of the branchial organs; X 55. 
The lower portion of Fig. 9; X 190. 
Section of the superficial layers of the upper surface of the organ; X 270. 
Explanation of letters in Figs. 8-11: c. m., central mass; c. t. c., connective 
tissue capsule; el., ellipsoidal mass; ep. epithelial layer; p.l., pigment layer; 
s. c., superficial connective tissue; s. i. c., superficial layer; s. m., superficial 
membrane. 
Sagittal section of the anterior abdominal organ; X 75. 
c., capsule; c. m., central mass; co., cover; i. c., inner cone; p., pigment 
layer; p. c., posterior cup; s. c., superficial cells. 
