108 
REPORT— 1854 . 
belonging to different faunas. A beginning had been made in Liverpool bv the 
present of a series of Mazatlan shells to the Free Museum (by Mr. G. Ilulse),— 
winch was exhibited to the Section. If merchants, captains," and sailors would 
exert themselves to obtain similar collections, not only the inhabitants of Liverpool, 
but the scientific world generally, would bo much indebted to them. 
On the Development of the Embryo of Purpura lapillus. 
By Professor W. B. Caupxkter, M.D., F.R.S. 
The flask-shaped capsule formed by these animals contains from 500 to 600 vitel¬ 
line oodies, having the appearance of eggs; yet only from about 12 to 30 embryos 
are produced, each of these having from 20 to’ 30 times the bulk of the ovum from 
which it sprang; so that the material contained in the original mass of eggs must 
in some way or other have been appropriated bv the comparatively few embryos 
winch are thus developed at its expense. By MM. Korea and Danielssen, who had 
previously examined into this subject, it was affirmed that, after the segmentation 
oi tne v itellinc bodies mto from about 12 tn 16 divisions, the whole of them coalesced 
mto one conglomerate mass, which afterwards subdivided into pedunculate frag- 
. m r t8 ,\f° nt ‘T I, g “ ,ur B er or smaller number of the original yulk-aegmcnts, every 
one of these fragments becoming an embryo. J)r. Carpenter stated, however, that 
IwTVi^l rVatl0D * had k ’ d him tQ entirely different view of the process; and 
rnSnU! "'T confi< lwcc in the correctness of his interpretation of it. since it 
wus obvious, from hia mvHnrvotmpc' • n s...... ii. . u.. .j kn/j ()ip uiiiior* 
Ue > llutl llunae| f examined so large a number of capsules, in which • 
merati f x ‘ r °f small free embryos presented themselves before the conglo* 
generated inri n ,f ^Ju* ova, that he could not doubt that they are 
between their twr™ '!/ ^iieae embryos very soon come to possess a mouth 
its interior n „ ? Cll,atcd l,,be8 * ™ d lends, by a wide .esophagus, ciliated m 
the g<lstric cawit y- The embryos then attach themselves to 
which it is cnmnii^ t * ffia9 ? • and b y tlxe action of these cilia, the small segments of 
by them ifJ^i^ dmcn down into their interior, which is soon distended 
embryos’mav l? SU J be °P eilcd shortly after the conglomeration bus token place, 
- so m TLiL fo , 0,1 , dattac r d la the yolk-moss, presenting various gradations of 
JSk, and hav^nv!} 1 flt,lc f" Pr th “» *»•« ^ embryos seen in a previous 
vi.ms y contabed - S | a 1 Bi,, f , ‘ Uttntit 5' o{ >' olk «*pe,-added to that which they 
formed embryo thoTiwh*! 0thc ” * ua - v k ^c already acquired the bulk of the » 
however tin "mill n' presenting no advance in development. Even in these 
u,g, tobe imbSfi f’i 01 u fk ' m ' ,,<J from original ovum, may be shown (by crush* 
Thus, then the 21 ?° 1 acc f 9fior y > ,llk thus derived from the conglomerate m** 
tained in the oridnalTL' i' Vd ° ped fro,n a “nail number of the egg-like bodies «n- 
owii evolution, the material act 1 “ H . l, >' eat U P» though at a very eariy stage of 
ditional supply orX - M PP |Mal V the rest; and if they do not obtain *»!* 
developing only the eiliatSn 1lnsufIicicnt amount of it, they become abor >, 
these abortive embrv ns W"* with or * the foot : one or more* 
The bodies which, iESjSSf *° b ° T* wiUl iu thc ca l ,?uIe near ,tS ^ Car¬ 
penter was inclined tn coalesce into the conglomerate mass, U • 
inclined to consider as im perfectly f ertilized ova 
°n some Points connected with the Natural History of the Azores. 
After ei vimr „ J 1 Pof *“ or E * fOKBES, FJLS. 
the continent of toeanffc V,eWB on tlie geological relation of the 
of Mollosca made bv his r »» proceeded to make some remarks on a co 
species Of UasteC r l l f ,end Mr ' ^‘Andrew. Amongst them were forjHg 
of Cephalopoda. Of n ®P ecip s of Lamcllibranchiate Mollusca, and £ ne sp Oj 
only one species wi Si in were "‘"able to the Lusitanian 
Islands. There was n ij Ht „i America, and this was found also rn the 
of these were peculiar but ° f f ifteen species of land Mollusca; ° ne ; . 
Fauna. 1 bUt tbe belonged to the West Atlantic or Losi^ 
