. Journal of morphology . fe. ^i^>-i> «r r)dp.»eg. pdp- Fio. 21. Tub .TouKNAi of Moupiiolouv.—Vol. XX, No. 3. Tlate 23, Stage IV. Showing the partial coalescence of the two parts of therostral rudiment, the extension of the optic plate, o. ?>/., the formation ofa distinct coxal portion to the pedipalps, pdp. c, which forms the rudimentof the mandibles. The increase in the number of neuroblasts in the cerebraland optic areas, and their extension to the neiiromeres of the chelicer?e,pedipalps, and the thoracic appendages, is apparent. Fig. 24. Stag
. Journal of morphology . fe. ^i^>-i> «r r)dp.»eg. pdp- Fio. 21. Tub .TouKNAi of Moupiiolouv.—Vol. XX, No. 3. Tlate 23, Stage IV. Showing the partial coalescence of the two parts of therostral rudiment, the extension of the optic plate, o. ?>/., the formation ofa distinct coxal portion to the pedipalps, pdp. c, which forms the rudimentof the mandibles. The increase in the number of neuroblasts in the cerebraland optic areas, and their extension to the neiiromeres of the chelicer?e,pedipalps, and the thoracic appendages, is apparent. Fig. 24. Stage V. The advances made in the development of the cephalicplate are shown in the deepening of the anterior groove, ant. gr., and ofthe lateral grooves, hit. gr., the shifting of the rostrum from the anteriormargin of the plate to a point between the cerebral ganglia, the more com-plete union of the parts of the rostrum, and the beginning of the foldwhich forms the roof of the cerebral vesicle, o. f. PBOCEPHALIC LOBES OF EPEIRA E. LAMBERT.
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