296 THE CEPHALOPODA. <§. 259. 



in the sea.^^' With those of Argonauta and Tremoctopus, the envelope 

 is composed of a solid, homogeneous, colorless substance, and at their pointed 

 extremity there is a small filament ; these filaments being entangled to- 

 gether, the eggs form large botrjoidal masses. Argonauta attaches these 

 bunches to the convex portion of its shell ;'^^> but Tremoctopis, v?ith which 

 these masses are in chaplets, forms them into a stafi"-like structure, by 

 means of a tissue of leathery consistence, secreted for this purpose.*"' With 

 the other Cephalopoda, the eggs are arranged in tubes or in fillets. *^^ 



§ 259. 



The siiijj^>le, round, or oblong, whitish Testicle, is situated, in most 

 species, at the bottom of the cavity of the mantle. It is surrounded by a 

 capsule derived from the peritoneum but adherent to it only at one point. It 

 is composed of numerous ramified cylinders, converging from the periphery 

 towards the centre, which is occupied by a narrow irregular cavity. 



The sperm is formed in the intervals of the cylinders and thence passes 

 into the deferent canal, which, at its passage from the testicular capsule, is 

 narrow and very flexuous, but suddenly dilates at its upper extremity, — 

 where its walls are thick and glandular, and have a longitudinal fold on 

 their internal surface. 



This glandular portion of the Vas deferens receives the orifice of an 

 equally flexuous caecum, which is probably an organ of secretion ; and 

 terminates, finally, in a large sac with muscular but thin walls which are 

 plicated longitudinally. This sac, known as the Bursa Needhamii, is 

 followed by a fleshy tube [Ductus ejaculatorius), which extends directly in 

 front and projects, as a short penis, into the cavity of the mantle near' the 

 rectum.''' 



With the Loligina, and with Octopus, and Eledone, the sperm is not freely 

 evacuated, but is enclosed in very complicated organs [Sjjermatophores), 

 which, at the epoch of procreation, accumulate in abundance in the Bursa 

 Needhamii, and are large enough to be seen with the naked eye. They are 

 always cylindrical and consist of a homogeneous, colorless, solid tube, round 

 at the anterior extremity, but at the postej-ior end, somewhat constricted and 

 then dilated into a kind of sphere. Each of these Spermatophores contains 

 two kinds of organs : a very thin sac filled with spermatic particles, and an 

 apparatus to project these particles outwards. 



The Sperm-sac always contains fully-developed spermatic particles 

 bundled together: it nearly entirely fills the cavity of the tube, through 



12 These chaplets are long with ioij,:ro fM/g'aris, IS See ^uoy and Gaimard, Ann. d. Sc. Nat. 



and short with Sepioteuthis ; see Burdach, De XX. 1830, p. 472, PI. XIV. B., and Ferussac, 



quibusd. anim. marin. p. 155, Tab. XII.; Firus- loc. cit. Ocio/>u.s, PI. XXVIII. fig. 3. 



sac, loc. cit. Loligo, PI. X. fig. 1, 1% and KoUiker, 1 For tlie male genital organs of Octopus, see 



loc. cit. p. 14. Cuvier, M6m. loc. cit. p. 32, PI. IV. fig. 5 ; he 



ISflans-, Magaz. d. Zool. 1837, V. Taf.LXXXVII. regards the upper glandular portion of the deferent 



liXXXVni.; Ferussac, loc. cit. Argonauta, PI. canal as a Fesicula seminalis, and Uie coecum 



I.'^- appended to it as a Prostata. See, also, Delle 



14 This body has a peculiar structure, and un- Chiaje. Descriz. Tav. VI. fig. 2, Tav. XI. fig. 2, 3, 



doubtedly, is made by the animal itself. It is Tav. XII. fig. 28 {Octopus, Sepia and Loligo) ; 



comjiosed of numerous, superposed, very distinct iyagner,Icim. zuot.Tuh. XXIX. &g. 22 (Octopus) ; 



layers of a granular, probably coagulated sub- Peters, in JUti/Zer's Arch. 1842, p. 332, Taf. XVI. 



stanoe ; — forming a kind of staff or baton by which fig. 2, 3 (Sepiola), and especially the beautiful 



the eggs are bound together in groups ; for, accord- figure of those of Sepia by Milne Edwards, in 



iug to Kdlliker (loc. cit. p. 14), it (Tremoctopus) the Ann. d. Sc. Nat. XVIII. 1842, p. 344, PI. XV. 

 carries the entire mass attached to the suckers of 

 one of its arms. 



