532 



Forty- fifth Report on the State Museum. 



with eggs, the slight color of the latter deepens the tint of the 



entire organ. 



The location of both male and female reproductive glands is 

 essentially the same. Generally they are found 

 to occupy the main trunks of the vascular 

 sinuses though they may extend into the vis- 

 ceral chamber, and, in some of the inarticulate 

 genera (Lingula, Discinisca), be restricted to 

 the latter. When in the pallial sinuses, though 

 attached to the upper and inner wall of the 

 mantle, they frequently leave a lobed or pitted 

 impression upon the shell, which is retained 

 after the shell is fossilized. q 



The discharge of the genital pro- 

 ducts is effected by two or four tubu- 

 lar organs or funnels, which have been 

 described by some authors (Owen) 

 as hearts. These trasverse the 

 wall of the perivisceral chamber 

 and open outward into the pallial 

 cavity. Their inner openings are 

 large, expanded orifices, abundantly 



Fig 



?? 



Section of 



ovary of Crania, show, plaited, aild Separated by a COnStric- Fig; 193,-Sper- 



ing the suspended ova f - f f u ^p^^p, n c, r t A V n matozoids of 



in various conditions tl0n irom tne narrower part. u\a Crrt , uamuch 

 of development, have been seen to pass through these enlarged. 



(Joubin.) organs (MoKgE) tQ which they ape (Joxtbix.) 



drawn by the action of the cilia covering their surface. 

 Huxley considers that these funnels also subserve the function 

 of renal organs and that they are homologous to the organs of 

 Bojanus in the mollusca, and to the segmental organs of the 

 annelids. 



It is generally believed that fecundation takes place after the 

 discharge of the eggs into the pallial chamber or into the sea 

 water. Am interesting condition of fecundation occurs in Laca- 

 zella and Cistella, which compels the conclusion that the 

 spermatozoids have penetrated from without into the visceral 

 chamber and (here fertilized the eggs. 



A fold is formed by an expansion of the mantle, which incloses 

 a number of fertilized eggs, attached to two very large brachial 



84 



