46 HKYKLol-MKNT OF 'I'M!', < T.I' II A U >!'( >DA. 



Clltllbert roIliiiM-WMod (.lour. Linn. SoC., xi. 1*7.".). encoun- 

 tered (in 1*7<>). Moating upon the surface of tlic Atlantie Ocean. 

 in hit. :I7 N. and lono. -Js \\..\\ ovlat in,, us object . ^omewliai. 

 cylindrical in form, :il>oiit _> fed loiio' and 1 or .". inches in 

 diameter. ;ui<l containing cephalopodons ova arranged in c]n~ 

 and single rows. The yonm_r animals ive re very active, and in 

 I'ad ucrc all discharged a sh<irt linu- after the nidus had UTII 

 secured. It. is inipossilile to ascertain positively at pfesent to 

 which LI'( nns this curious form belongs, thoiiu-h cvidcntlv tli<' 

 animal is tinned and pelagic. Tlic whole oviposit is hei'e nnite<l 

 within a single o'elatinons coverinu' instead of l>eiii'_ _-led 



into SaU8age-8haped masses each Tilled with einl>i-yo> as iii Loli^o, 

 or in separate eir^s as in Sepia. I ^ive a I'm-urc of one of these 

 ova, maii-nilied *1\ diameters. A similar lloatiiiir nia>s \\a^ 

 ohtaincd by Mr. II. (Jrenacher. at the Tape Verd Islands, in 

 January. 1*72; it was neai'ly ^-.") feet lonu' by '> inches in 

 diameter. I o-ivr fiin'iircs both of nidus and embryo, extra. 

 from his elaborate and valuable paper on t lie development of this 

 interestiiiL: form (Xcif. HVxx. /<><>!.. xxiv. Is74). 



^noy and (iaimanl (Ann. He. Mil.. \x. 1S:!(I) discovere(l neai- 

 the Moluccas, a cylindrical nidimental mass. :; feet lmo- and 

 1 to s inches diameter, composed of cephalopodoiis eo-o- s pl.-iced 

 in double rows on a ribbon, the circumvolutions of which, wilh 

 margins overlapping, formed the cylindrical shape. I figure this 

 mass, as well as a portion of the ribbon, showing the disposition 

 of ti is well as one of the hitter, magnified. The ribbon 



dor-, not materially ditfer from the small portion discovered by 

 d'Orbiii'iiy in O/-/o///s innnlira numi*, and which lie has rrro- 

 nconslv figured as a poilion of the nidus of that animal (see my 



Pig. r,, IM. -2(i). 



Development <>l UK' Cephalopoda- 



" In the dibranchiates ih( yolk undergoes partial division, and 

 the blaModerm (yolk ^;\c) lorme(| upon face of it by the smaller 

 blaNt(meres. spreads iiradna lly o\ cr the whole ovnm.ench> 

 the larger and more slowly dividing blastomeres. The mantle 

 make- its appearance a> an elevated patch in t he cent re of the 

 bla-toderm. whilst t he fi it lire arm> appear a^ -\ i in net rieally dis- 



