218 



THE FROG— THE PLAT ANA 



deferentia for the generative products. See ureter on page 214. Each ureter 

 has a slight swelling, the vesicula seminalis, on its outer side. 



[In the Platana the ureters unite posteriorly to form a single duct which opens 

 into the cloaca.] 



In the female Frog note : 



(a) The ovaries, a pair of irregularly-lobed organs, usually consisting of 



rounded black and white bodies, the ova. The ovaries are attached 

 to the dorsal wall of the body-cavity by a fold of the peritoneum. 



(b) The corpora adiposa lying in front of the kidneys. 



(c) The long convoluted oviducts opening in front into the body-cavity and 



behind into the cloaca. Their terminal portions are greatly dilated 



ovisacs in which the eggs are retained for a time. 

 [In the female Platana the ureters open separately into the cloaca.] 

 Make a drawing of the urino-genital system. 



Fifth Day 

 Skeletal System (continued). 



A. The Pectoral and Pelvic Girdles and the Limbs. 



1. Detach a fore-limb with the remaining parts of the pectoral girdle. Make 

 a preparation shoAving : 



Supra-scapula, scapula, remainders of the clavicle and the coracoid, humerus, 

 radio-ulna, carpal bones, and digits. Draw these parts. 



A B 



Fig. 76. — A. Pectoral Girdle of Bana ; and B. of Xenopus. 

 The dotted portions indicate cartilage. 



2. Detach the pelvic girdle from the transverse processes of the 9th 

 vertebra. Remove it along with the hind-limbs from the body. Detach 

 the limb from one side of the pelvic girdle, and make a sketch showing 

 the following parts of the pelvic girdle : — 



Acetabulum or socket for head of femur, ilium, ischitmi, and pubis. {See 

 Fig. 79.) 



Acetabulum 

 Umin , _ Ischium 



Ilium 



Acetabulum 



\ Ischium 



Pubis' 

 Pubis 



A B 



Fig. 77t — A. Pelvic Girdle of Rama ; and B. of Xenopxta, side view. 



