41', DKYKUtl'MKNT OF TIIK i T.I' 1 1 A U MM >l> A. 



Cuthbert Collingwood (J<>nr. I jinn. Nor., \i, 1*73), encoun- 

 tered (in 1X70). lloating upon the surface of the Atlantic Ocean, 

 in Int.:;? N. .-iiul long. i>s \V.. a gelatinous object, somewhat 



cylindrical in t'onn. about *2 (ret, long Mini 1 or f> ineiies in 

 diameter. :iml contain ing cephalopodous ova arranged in cluster- 

 Mini single rows. The young animals were very active, and in 

 (Met were nil discharged M short, time Mt'ter the nidus liMd lieen 

 ^ecin-ed. It is impossible to :iseerl:iiii posit ivelv Ml, present to 

 which genus this furious I'onn helon^s. tliou^h evidently the 

 MiiiuiMl is finned Mild jx-lM^ic. The whole oviposit is here united 

 within M. sino-le u'elMtinous covering; insteMd of beinr M 

 into sausage-shaped niMsses eMch lille<l with embryos as in 

 or in se|);ii-;itc e^'_^ MS in Se|)iM. 1 ji'ivr M li^ure ol' one of these 

 OVM, niM^nilied ~1\ diMineters. A similMr HoMtiiiLi' HIMSS WM^ 

 ohtMined by Dr. II. (ireiiMeher. M! the ('Mpe Verd Islands, in 

 .IMIIUMIT. 1-^7-2; it \VMS neMrly ^-.") feet lon^ by C. inches in 

 liMinet.er. I ii'ive (iii'iires both of nidus Mild embryo. exti'Meted 

 from his ehiboi'Mte Mild VMliiM.ble j)M|)eron the development oi' this 

 interesting form ('/ell. IIYss. Zoo/., xxiv, 1874). 



(^uoy Mild (iMiniMi'd (Ann. He. Nat., x\. ls:>ll) discovered ne:n 

 the MoluccMs. M cylindricMl nidimentMl IIIM^S, :\ I'eet lon^ and 

 I', to s inches d'lMmeler, compo>ed of cepliMlopodous eo-o-s phiced 

 in double rows on M ribbon, the circumvolutions of which, with 

 margins overlapping, formed the cylindrical shape. I ligurr this 

 mass. MS well MS M portion of the ribbon, showing the disposition 

 of the eii^-s. MS well MS one of the hitter. niM^niiied. The ribbon 



does not materially differ from the small portion discovered by 



d'Orb'm'iiy in (h-ln/nt* inrwhrdmirrH*, and which, he IIMS erro- 

 neously figured MS M portion of the nidus of t.hnt animal (see my 



Pig. <;.' IM. -20). 



/)< rr/ojunrn/ of ///< Cephalopoda. 



" In the dibranchiates the yolk undergoes parted division, Mild 

 the bhistoderm (yolk SMC) formed upon lace of it by the smaller 

 bhistoinei-es. spreads gradually over the whole ovum, enclosing 

 the larger and more slowly dividing blastomeres. The mantle 

 makes its appearance as an elevated patch in the centre of the 

 blastoderm, whilst the future arms appear as Symmetrically dis- 



