M PI \ rKB. 



KM. 

 HeOtOOOtylC "I' tin- \i.;u;mt, enlarged nearly -'<> tin 



Trunk. 0. Terminal append,, nt :irnl:ii 'i , i ,. 



/. Sucker^. /. (';ivity. divided inli) three or four compait 

 ments. ./ u- (liniiii;itii|ilinr->. 



1<>. llect.>, -it\le nl' tin- Argonaut ciliary il. ./ . Ventral l>ace with the 

 BUOkerS And the medial porti.'ii containing the nm-cular ill 

 teguments. /'. Dorsal tare. r. Anterior and <l '. I'^teri>i 



-ide .>f the body. >. Appendages of the posterior side in nat 



nral position. /. Membranous appciida-c. //. I)or>al rn->t. 

 It. Opt-ninu at tin- r\t ivinity f tin- (treat. /. Spi-riii:iti- rap.siih- 



with tin 1 ohromatophores. 



11. The same, with the appcnda-c detached from the sperinatir 



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



penis. /. .M -dian part of the lndy containing the muscular 



canal. 

 18, llectocotyle of Tremoctopns enlarged. a. Anterior cupnles 



b. Posterior cupules. d. Posterior part of body. /;. Sp<Miiiatic 



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

 14. The Bamedorsa] side. The references are the same. U. Chro- 



matophores. 



Plate 16 



Ilectncotylized Arms. 



From Clans. Archiv fur Natnrg.. i, t. 10, 1858 39 



1. Enoploteuthis, Owenii. Ver. 



J. Hnoploteutliis Mar^aritifera, lliipp. 



'.'>. Hectocolylixcd arm of Sepiola Rondeletii. 



4. First and second arms of a female Rossia 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. . 88 



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, HI., showing 



attachment of spermatophores. Steeiistrup, Mem. Acad., 

 Copenhagen, v. ser. x 38 



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

 :. Siicrmatophoic of Sepia officiiialis. Keferstein, 1. c., t. 122, f. 14, 



A ct ual length, 8 mil 38 



\nterioreiid of samw, move eiilargvd. Keferstein, 1. c., f. 16 3S 



i. The same, with the si>enns pushed forward 



Spei-ms of same. Kel'ei >tein, 1. c., t. 121, f. 10 88 



1). He. tocolyli/.ed arm of Sra-nrgus t itanotus. Troschel, Archiv fur 



Naturg., i, t. 4, 1S.-,T :','. 



Plate 18. 



Mrucf.nre of Eectocotylen. 



Verany and Vogt. Ann. Sc. Nat., :',d MT., N\ii, t. '. 38 



t37. A spermatphore of Tremoctopus ( arena', extracted t'rom its 



*JS. Anterior e\ti-emity of the .same <i. Transparent envelope, 

 aculatory OOrdCML 6. Seminal cordon. 



