Journal of experimental zoology . a normal annulus. In specimen four there were two pits close together and some-what involved with one another, Figs. 4 and \. Both were wideopen, ended bluntly at their anterior ends and expanded pos-teriorly into a wide depression. The more dorsal pit was nearerto the median plane, the other more to the anmials left side. In the fifth specimen. Figs. 5 and 5, the median pit was muchlike that in a very young larva. A depressed area near the pos-terior edge of the annulus leads forward into a deep groove, thewalls of which are very thick inturned shell. In this
Journal of experimental zoology . a normal annulus. In specimen four there were two pits close together and some-what involved with one another, Figs. 4 and \. Both were wideopen, ended bluntly at their anterior ends and expanded pos-teriorly into a wide depression. The more dorsal pit was nearerto the median plane, the other more to the anmials left side. In the fifth specimen. Figs. 5 and 5, the median pit was muchlike that in a very young larva. A depressed area near the pos-terior edge of the annulus leads forward into a deep groove, thewalls of which are very thick inturned shell. In this specimenthere was a slight pouch on each side where the cavity of thegroove was wider than the open mouth of the groove. In avague way these side pouches suggest the recess of the normalannulus. These imperfect annuli, laid bare at the time of shedding,would doubtless have continued outwardly in that shape until thenext shedding. Whether they would have progressed, during Partial Regeneration of Sperm-Receptacle in Crayfish 127. Fig 4 Fig. a.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1904
