. \l -II 1 ! 



placed upon t In- o| her. ll [ggeoreted b\ lln- |i:ilni:it< i the 



female, which are >u-l :i ill I V applied to it and eim-lop 



them In lln- male A ruona ill . alwa\- much ->maller. 1 here HIT no 

 )i:ilni:itc(l arm-, and consequently. n> shell. The ^hrll iNdf 

 appears t,, be iiM-fiil i)iily:is:i portable Cradle for t he development 

 .f |! . .mi] the :iiiiii):il which forms it does not appear to 



diller greatly from the shell-less Octopu-. 



The <|iie-tion of the para-itism of the :inim;il of tlie A r^. HIM ill 

 in its shell. originally assumed by distlllgaished lint nr;ili-N, h:is 

 Iteeu SO long debated, tllftl <inite :\ liter.Mtiire upon t he ->nliect h.-i- 

 :iccumnl:iteil. The w;int of :il t Mcliinent of t he :inini;il by :nMin-t or 

 muscles, .-uid the fuel that the shell itself is not moiiMe.! on the 

 ;inim:irs hody. nor does it correspond to the S!I:I|M- of the hitter, 

 were ^> strong evidence of )>a rusit ism. th:it the anim:d itself 

 leM-rilnMl MS ( )c\ thot'-. and the shell as A r^onanta. The obser- 

 vations of Madame .leanette Power first set this vexed ^notion 

 at rest, ly showing that the animal builds its shell by the exu- 

 dation of material from the expanded or veiamentons arms ol 

 the female, instead of from the mantle, as in true mollnscoii- 

 -hells. 



The text nre of the Argonaut shell, or egg-nest, ifl porcellanou>. 

 composed of small plates or prisms; it- earlier portion is covered 

 with a chagrined e.nticle. and its toothed periphery is stained 

 with l>i-own. On either side the velainentons dorsal arms are 

 applied to it> external surfaee, and not only do they add to the 

 margin when lirowth takes place, but they stitlice al-o to renew 

 any broken portion of tin- already exist ino- walls. 



In a specimen of Arymnmhi . l/v/o. which form- a part^of the 

 collection of Amherst Colleuc. a |)ortion has ln-eii broken out 

 near the middle of t he left side, and not f;ir from t he -inn- of t he 

 aperture. A new deposit of testaceous substance, together with 

 a broken fragment . ha> closed the opening in t he rude manner 

 Common in the Sheila of the molluscn. \\\\\ the moM extraor- 

 dinary circumstance i- thai a IVjiLrment which wa> broken out in 

 the accident which befel the animal. m>\\ constitutes two-thirds 

 of the repaired portion, and that t he original inner surface U now 

 ! he outer surface, as i-> e\ idi-nt from it- concavity, stylr of undu- 

 lation, and texture. It is also nearly at riu'ht aimle- to 

 inal position. These f.-u-t^ -how that the piece wa> totally 



