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46. 
EXPLANATION OF PLATES 8 AND 9. 
List OF ABBREVIATIONS. 
an = anus. ar=archenteron. ar, = the anteriormost part of archen- 
teron, the future hydrocoele. ar, = the middle part of the same, the future 
enterocoele. ar, = the last part of the same, the future gut. as = axial 
sinus, or ‘madreporic vesicle’. at= atrial cavity. be = blastocoele. 
bj = blastocoele jelly. b/= free cell in the archenteron, hydrocoele, or 
enterocoele, so-called ‘blood corpuscle’. bp = blastopore. c = cilia, 
¢C,_, = ectodermal thickenings at ciliary bands. dp = dorsal pore. en = 
enterocoele. enc=epineural canal. ep=ovarial wall, f = follicular 
epithelium. g=gut. gs=germinal spot. hy = hydrocoele. j = the 
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