384 LEWIS HENRY GOUGH. 



PLATE 14. 



Avitellina centripiiiictat;i (Rivolta). 



Fig. 43. — Sagittal section through nine seguieiits. showing cirrus 

 pouches and vagina; of four segments. X 88. 



Fig. 44. — Anlage of vagina and cirrus, x 784. 



Fig. 45. — Transverse section of vagina. X 784. 



Fig. 46. — Anhige of vas deferens. X 1176. 



Fig. 47. — Developing oviduct, x 1176. 



Fig. 48.— Fibrous tissue, x 784. 



Fig. 4*J.— Portion of ntei'us. with oocytes surrounded ].<y nutritive 

 cells. X 1176. 



Fig. 5iJ. — Transverse section through a cirrus-pouch, showing the 

 vas deferens suspended by "loose parenchyni cells." x 784. 



Fig. 51. — Anlage of paruterine organ on the uterus-wall ; three 

 oocytes are represented surrounded ]:>y nutritive cells, x 784. 



Fig. 52. — Developing paruterine organ, x 190. 



Fig. 53. — Developing paruterine organ ; the " pockets "" (j^p-) are just 

 forming. X 190. 



Fig. 54. — Paruterine organ : a somewhat older stage than fig. 53. 

 X 190. 



Fig. 55. — Paruterine organ with eggs entering the pockets. X 190. 



Fig. 56. — Fidly developed paruterine organ ; all the eggs have 

 entered the pockets of the pouch. 



Figs. 57-65. — Oocytes in various stages. 



List of Abbreviations used. 

 [The alibreviations u.sed are the same throughout the paper.] 



a. Sucker, at. Cloaca, h. in. Basal nieml)rane. h.p. Basal plate. 



c. Cirrus. c. c. Connecting canal. ch. Chromatin. c. I. Coniidial 

 layer. c. 2>. Cirrus pouch. c. s. Canalis seniinalis. cu. Cuticida. 



d. Dividing nucleus, d. c. Doi'sal canal, c. Egg. cjh Epithelium. 

 ep. c. Epithelial cell. /. Fila-illa. /. c. Flame-cell. f. c. d. Developing 

 flame-cell. /. Flame. /. p. Fibrous j)ad. fu. Funnel, (j. Gland-cells 

 surrounding the vagina, yl. Glia-cells. /(. /. Homogeneous layer, i. d. 

 Interuterine duct. 7i. Capilhuy. /.•. c. Capillary cell. /. Lumen. 

 I. i. Inner layer, l.o. Outer layer, ni. Muscle. Dth. Myoblast. ///./. 

 Miiscle-fibriUa. n. Nerve. n. c. Nutritive cell. nf. Neurotibrilla. 



