I'RINOGENITAL ORGANS 



cartilage is usually produced into a sharp calcified style, near which 

 terminal pieces are developed (Fig. 88). 



Among the Selachii, Huber distinguishes three main types of 

 modification of some importance in classification. Type A : with 



Kic. IK). 



B. 



A, Urinogenital system of the female, 1), of the male dogfish (.s - r//Mi<u;i). ali.fi, abdom- 

 inal pores ; d, cloaca ; <-i>, claspors of the male ; /, rudiment of the oviducal opening in 

 the male ; Ifd, metutephiic ducts ; mtn, metanepbros ; od, oviduct; oe, cut end of oesophagus ; 



o.g, oviducal gland; oi>, ovary; /'./, pelvic fins; ;;, rectum; x.x, sperm-sacs ; T, testis ; .//. 

 urinary papilla in the female ; ug.p, urogenital papilla in the male ; u.s, urinary sinus ; ii.e, vasa 

 ril'i'nnitia ; r.x, v.'sicula seminalis ; H'.rf, Wolttian duct: II'.;;, Wolllian gland or mesone[iliros. 

 < After <;. C. Hourne.) 



n prominent hard terminal style, piercing the skin ; a tegumentary 

 fold partially covering the groove ; and the whole internal cavity 

 glandular. Type B differs from the former in having the tegu- 

 mentary fold inside, the overlapping edges of the main cartilage 

 more developed and turned in, and the terminal cartilages reaching 

 to or beyond the end of the style. Type C : the gland is 

 specialised and of tubular structure ; and one, two, or three of the 

 accessory pieces form flattened sheathing-plates (Fig. 89). Type A 



