296 CLA VPOLE. 
EXPLANATION OF PLATE XXIII. 
Surface Views of Embryos. Erlich’s Haematoxylin. 
Fic. 40. Ventral view of early embryo. The embryo is rolled over and rep- 
resented as laid out flat. at. antenna, 7.c., intercalary appendage (2d antenna) ; 
md., mandibles; mx ;., mx2., maxillae; ¢., Ist thoracic legs; fc.o., precephalic 
organ. Obj. 8, oc. 4, tube length 154. 
FIG. 41. fg. ¢3, 2d and 3d thoracic legs; a@;., 1st abdominal appendage ; 
other letters as above. Obj. 8, oc. 4, tube length 154. 
Fic. 42. 7d., labrum; a@;.-ads., abdominal segments and beginning of append- 
ages; pd., proctodaeum; remaining letters as in Fig. 41. Obj. 8, oc. 4, tube 
length 153. 
Fic. 43. Face view of later embryo, shown in side view in 43a. Flexure just 
beginning. .f, mouth fold; m.Z., mouth-parts; z#a., thoracic appendages; c/., 
collophore ; @2.—a4., appendages onabdomen. Obj. 4, oc. 6, tube length 15}. 
Fic. 43@. Outline side view of embryo represented in Fig. 43, showing begin- 
ning of flexure. Obj. 16, oc. 4, tube length 15}. 
Fic. 44. fc.o., precephalic organ elongating ; 7., last membrane shed ; other 
letters as above. Obj. 8, oc. 4, tube length 15}. 
Fic. 45. Flexure almost complete. ¢., eyes; remaining letters as before. ay. 
is larger than any of other abdominal appendages excepting the collophore. Obj. 
8, oc. 4, tube length 15}. 
Fic. 46. Head of embryo showing the beginning of the mouth fold, m.f. 
Obj. 8, oc. 4, tube length 15}. 
Fic. 47. Enlarged head of embryo of same stage as Fig. 42. fc., procere- 
brum; dc., deutocerebrum ; ¢c., tritocerebrum bearing 2.c., the intercalary ap- 
pendage. Obj. 8, oc. 4, tube length 15}. 
Fic. 48. Newly hatched young Anxurida maritima. Letters as before. Rei- 
chert, obj. 3, oc. I. 
