Habits and structure of Cotylaspis insignis Leipy. 241 
Fig. 37. One of the concretions of sperm duct in place, from section, 
850:1. 
Fig. 38. A median section of the active spermary, from a sagittal 
series, picro-nitric, iron-haema. 320: 1. 
Fig. 39. Two parietal cells of the spermary from an animal killed 
in May, corrosive subl., iron-haema. 850:1. 
Fig. 40. One of the central cells of the spermary in May, same as 
. preceding. 850: 1. 
Fig. 41. Parietal cell of active spermary, Fig. 37. 850: 1. 
Fig. 42, 43, 44, 45, 46, 47 (Pl. 15). Central cells from active 
spermary, Fig. 38 in various stages of spermatogenesis. 850: 1. 
Plate 15. 
Fig. 48. Ovary cut longitudinally, in plane of “tuba fallopii”. 
Fig. 49. A part of the “tuba” cut longitudinally. 850: 1. 
Fig. 50. Parietal cell of the ovary in July. 850: 1. 
Fig. 51, 52, 53, 54. Cells from different parts of the ovary, 
Fig. 48, showing development of the egg cell, picro-nitric, iron-haema. 
Fig. 55. Median section through one of the follicles of the vitellare 
from same section as Fig. 48. 567: 1. 
Fig. 56, 57, 58, 59. Yolk cells from follicle shown in preceding 
figure. 850: 1. 
Fig. 60. One of the yolk cells from the yolk-receptacle. 850: 1. 
Fig. 61. An egg as seen in the uterus of a living compressed 
specimen. 220: 1. 
Fig. 62. Yolk cell; from egg in uterus, from section, sublimate, 
iron-haema. 850: 1. 
* Fig. 63. Embryo cell from same egg as preceding, showing division 
in the nucleus but not as yet in the cytoplasm. 850: 1. 
Fig. 64, 65, 66, 69. Different eggs from one animal: as discharged, 
after 18 hours, 40 hrs., and six days respectively. 
Fig. 68, 69, 70, 71. Eggs from another individual after 48 hrs., 
48 hrs., and 90 hrs., and 113 hrs. respectively. 
Fig. 72. Egg from still another parent 66 hrs. after leaving the 
uterus. 
Fig. 73. Surface view of a very young C. insignis seen from 
below. 
Fig. 74. View of the same from above, showing the mouth funnel 
in use. 
Fig. 75. View from above as a semi-transparent object, 
Zool. Jahrb. XXI. Abt. f. Anat. 16 
