. Journal of morphology . Fig. 15. -*,« y. e. , msd. , A. E. ^^[•. .,vlk. Fig. 10. The .Tournal of Morihology.—Vol. XX, No. 6. Plate 17 and 18. Loiigitiuliiial sections throui,li the embryo at the begiu-uing of the gerru band stage, showing tlie position of the caudal thiclv-ening. r. th., immediately behind the blastopore, hpl., the mesoderm, just beneath the outer cell layer, erf., and the yolk cells, y. c, whichcontribute to the formation of the endoderm. PKOCEPHALIC LOEES OF EPEIRA E. LAMBERT. PLATE IV. ect. nisd. blp. ylk. ^/. 0. th. • P. A. E
. Journal of morphology . Fig. 15. -*,« y. e. , msd. , A. E. ^^[•. .,vlk. Fig. 10. The .Tournal of Morihology.—Vol. XX, No. 6. Plate 17 and 18. Loiigitiuliiial sections throui,li the embryo at the begiu-uing of the gerru band stage, showing tlie position of the caudal thiclv-ening. r. th., immediately behind the blastopore, hpl., the mesoderm, just beneath the outer cell layer, erf., and the yolk cells, y. c, whichcontribute to the formation of the endoderm. PKOCEPHALIC LOEES OF EPEIRA E. LAMBERT. PLATE IV. ect. nisd. blp. ylk. ^/. 0. th. • P. A. E. -. / 17. msfl. ect. V. c. blp. c. th. ylk .\. E. mp . i^ ( ?I 9 ?^ »J^ ^fm P. E. 1, Fig. is. The Journal of —Vol. XX, No. 3. Plate 1[). Cephalic of JJixira. Stage I. Showing the thidveiied areaswhich form the begiiiiiiug of the optic ganglia, o. gl., and the rostrum, rudiments of the chelicerje, clil. and , pf7/>.. and the lateralgroove, hit. gr. Fig. 20, Stage II. Showing a slight advance in the differentiation of theoptic ganglia and in the development of the rostrum ; also a marked increasein the growth of the pedipalps and chelicer:e. rROCEPHALIC LOBES OF EPEIKA CINEREAAVERY E. LAMBEHT. PLATE V. lat. ^^M ;»*
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