240 



THE DOG-FISH 



Fia. 53. — Scyllium canioula. Dissection of a female from the ventral 

 surface, to show the renal and reproductive systems. The right 

 lobe of the liver and the alimentary canal from the oesophagus to 

 the rectum have been removed. An arrow is passed up the left 

 oviduct, which is cut open to show its point, (a. m, m.) 

 Fia. 54. — Further dissection of the renal and reproductive systems. 

 The left oviduct is removed ; the right oviduct and the urino-genital 

 sinuses of both sides are laid open. (a. m. m.) 



A, auricle. AP, abdominal pore. B, pericardial cavity. G, cloaca. 

 E, oesophagus. F, pelvic fin, Gr, gill-slifc. L, liver. O, ovary. OD, ovi- 

 duct. OD', oviduct laid open. OQ-, oviducal gland. OV, ripe ovum in tlie 

 oviduct. P, abdominal opening of oviduct. PG-, pelvic girdle. Jl, rectum. 

 HO, opening of rectum into cloaca. S, mesonephros. SD, mesonepbxic or 

 Wolffian duct. T, metanephros. TD, metanephric ducts or ureters. TO, 

 openings of ureters into urinary sinus. UP, urinary papilla. TJS, urinary 

 ' sinus. V, ventricle. 



