Hovrx, — Cephalopoda, 
PLATE 10. 
Figs. 1-10. Abraliopsis hoylet. 
1; 
fo 
=p 
9; 
Ventral aspect, showing the arrangement of the luminous organs; X 21. 
h1, medio-ventral line dividing anteriorly to pass along the inner margin 
of the ventral arms and posteriorly to bound the siphonal depression ; /?, 
medio-lateral line passing forwards along the outer margin of the ventral 
surface of the arm; 43, ht, lateral line of organs; s, group of luminous 
organs on the under surface of the siphon; m1, m?, m, mí, successive rows 
of organs on the lower surface of the mantle; p, patch of organs from 
which the above lines arise. 
Sketeh of the inferior surface of the left eye, showing the position of 
the luminous organs; X about 8. 
. Portion of the surface of the mantle, showing luminous organs and 
chromatophores; X about 20. 
Axial section of a luminous organ, from the arm; X 150. 
Horizontal section through the lens ; X 150. 
Horizontal section through the upper part of the pigment cup; X 150, 
Similar section more deeply situated; X 150. 
Similar section through the posterior hemisphere; X nearly 200. 
Explanation of letters in Figs. 4-8: c. t, connective tissue; i. c., inner 
, pigment cup; p. A, posterior 
cup; i. co, internal cone; l, lens; p. c 
hemisphere; s., sinus. 
Section nearly in the equator of the eyeball through one of the larger 
ocular organs ; X 75. 
10. Similar section through one of the smaller ocular organs; X 75. 
Fig. 11. 
c. lower layer of connective tissue; c.l, connective tissue above and 
around the lenticular mass; f, fibrils ; A. f, horizontal fibrils; i. c., inner 
mass of connective tissue; /., lentieular mass; z., outer zone. 
Cranchia scabra. 
View of the mouth and oral aspect of the arms and left tentacle; X 20. 
Fig. 12. Argonauta, sp. 
Internal and external aspects of the shell of a young specimen; X 2. 
