Pbbntiss. — Otocyst Crustacea. 



PLATE 9. 



Figure 41 is of Cambarus ; all others are of Carcinus. In Figures 41 and 46 

 anterior is up; in Figures 42-45 dorsal is up and anterior at the left; in Figures 

 47 and 48 dorsal is up and lateral is at the right. 



Fig. 41. Ventral view of brain, showing central endings of otic and antennular 



nerves. Methylen blue. X 30. 

 Figs. 42-45. Outlines of four parasagittal sections through the left otocyst of 



Carcinas, cut along the lines of section marked with corresponding 



numbers in Figure 46. Figure 45 is most median, Figure 42 most 



lateral in position. X 15. 

 Fig. 46. Dorsal view of both antennules. Numbered Hues [42-48) indicate planes 



of section of corresponding Figures. X 8. 

 Fig. 47. Transverse section through the orifice of right otocyst (see Fig. 46, line 



47). X 15. 

 Fig. 48. Transverse section through anterior end of the otocyst (see Fig. 46, line 



48). X 15. 



