REFERENCE TO PLATES. 301 



FIGURES. PAGE. 



8. Hectocotyle of the Argonaut, enlarged nearly 20 times, a b. 

 Trunk, c. Terminal appendage, ef. The two tentacular cirri. 

 I. Suckers, i. Cavity, divided into three or four compart- 

 ments, x g. Chromatophores. 



10. Hectocotyle of the Argonaut enlarged, a. Ventral bace with the 



suckers and the medial portion containing the muscular in- 

 teguments, b. Dorsal face. c. Anterior and d. Posterior 

 side of the body. e. Appendages of the posterior side in nat- 

 ural position. /. Membranous appendage, g. Dorsal crest. 

 h. Opening at the extremity of the crest, i. Spermatic capsule 

 with the chromatophores. 



11. The same, with the appendage detached from the spermatic 



capsule. References as in preceding figures, k. A part of the 

 penis. I. Madian part of the body containing the muscular 

 canal. 



13. Hectocotyle of Tremoctopus enlarged. a. Anterior cupules. 



b. Posterior cupules. d. Posterior part of body. e. Spermatic 

 canal. /. Spermatic mass. g. Penis, h. Sheath. 



14. The same dorsal side. The references are the same. h. Chro- 



matophores. 



Plate 16 



Hectocotylized Arms. 



From Glaus. Archiv fur Naturg. . i, t. 10, 1858 39 



1. Enoploteuthis, Owenii. Ver. 



2. Enoploteuthis Margaritifera, Riipp. 



3. Hectocolylized arm of Sepiola Rondeletii. 



4. First and second arms of a female Rossi a dispar. 



5. Third left side arm of male Rossia dispar. 



Plate 17. 



1, 2. Male of Argonauta Argo. Miiller, Zeit. Wiss. Zool., iv, t. 1. . 38 



In 2 the arm is enveloped in the sack, in 1 it is developed. 

 Figures four times natural size. 



3. Buccal membrane of female Sepioteuthis sepioidea, Bl., showing 



attachment of spermatophores. Steenstrup, Mem. Acad., 

 Copenhagen, v. ser. x 38 



4. Buccal membrane of female Sepia aculeata,Hass. Steenstrup, 1. c. 38 



5. Spermatophore of Sepia officinalis. Keferstein, 1. c., t. 122, f. 14, 



Actual length, 8 mil 38 



6. Anterior end of same, move enlarged. Keferstein, 1. c, f. 16.... 38 



The same, with the sperms pushed forward 38 



Sperms of same. Keferstein, 1. c., t. 121, f. 10 38 



Hectocolylized arm of Scseurgus titanotus. Troschel, Archiv fur 



Naturg., i, t. 4, 1857 39 



Plate 18. 



Structure of Hectocotyles. 



jrany and Vogt. Ann. Sc. Nat., 3d ser., xvii, t. 9 38 



. A spermatophore of Tremoctopus Carense, extracted from its 



case. 

 . Anterior extremity of the same. a. Transparent envelope. 



b. Ejaculatory cordon, c. Seminal cordon. 



