LN8, 



:ni<l compiv^ed within tin- balance of I lie ease. I'PMI- 

 in <-.>nt:ii-| \\ilh the water these -piral bodir^ <-'.IIIIIH nee ni" 

 :nnl finally bui>| tlinm^li tin- thin end of the in\ permatO 



phoiv- l: '\ith Ilii-in their s;i<-k- of -pcrmato/ 



In Nautilii-.. \';in der Hoexeii ha* a-crrt a hied licit tin- -tincture 

 <>t' the *|MTiiialophoiv* i* niiieh more Dimple. In this 'jeiiu- tin- 

 oviduct ari-es from :i chamber uhich communic.-ilex with th.-it in 

 which tin- ovary i> h).|oel. .\ |;ir^e ;i I luiiiien ^Inml o|.ei!> into 

 tin- l:itter. So :ilxn the VO8 deferenif, in>te;nl of oriuin.'it iirj 

 (lireetlx from the s.-iek of the !' i >iimnmie;itev with it 



through :in intrm-nin^ chnniher. 



Tin- B6X6B in Sf/>itt oflirinulix \\r.\\ IM- readily externally li>- 

 tinirnislu-l. Tlu'i-f is in the tirst |>hiee a <iifl'erenee <>!' eolora t ion. 

 the females lieinii' unicolored. whilst the males have /elra-like 

 marking across the ma fjinal tins M ml the dorsal arms e-peeially 

 when irritated. Km tin- lu-st means of distinction i> in tin 

 relative h nuths of head with the arm>, and body : in the male^ 



tliese two dimensions are about i-|n:il.imt in the females the body 



is only two-thirds the length of the head and arms. The entlle- 

 hoiie in the female is much wider and more excavated Ix-hind. 

 UKIJT. M'-in. 1. inn. >V-. Hnr <l<><i u.r, \. IIS. 



Tile most curious portion of tin- sexual history of the cephal- 

 opoda is undoubtedly that which relates to their sexual union, 

 which is accomplished through the oilier^ of one of the arm> of 

 the male, which becomes modified in it s structure for t his pur- 

 JID-M-. This arm. very unlike the others in appearance. >oinetimes 

 becomes detached from the animal during the sexual union, and 

 remains within the mantle of the female for a period, ilurino- 

 which it enjoy* a >eparate life. Kach n'enu- >ivm> to In- charac- 

 terised, not only liy the particular arm. either on the ri^ht or 

 left >ide of the animal which 19 th\lS hectOCOtylized luit :ilso liy 

 ditlerenco in its appearance and structure. The third left 

 arm of the A ru'<>n:iut is lirM developed a- a l>alloon-shaped >ack. 

 which finally splits open and reunite* it> h.-ilves upon tlu- dorsal 

 face of the arm which i-nu-riiv* from it, forminu ;i chamlu-r which 

 becomes tilled with spermatophores, in a manner not yet under- 

 I. Indeed the invi-st i-:it ion of this whole sultject mavl>e 

 idered as yef in its infancy, and many point- remain ' 

 cleared up: tlm* in >OIIM- u nera no -ack for the recepti. 



