84 Transact ions. ! 



says he was by no means certain. In a later paper (1882) he says he found 

 an animal with the oviduct distended with eggs, and it showed clearly that 

 his supposed " accessory gland " was the commencement of the oviduct. 



I can find no opening of a female duct in the position figured by Quoy 

 and Gaimard, nor do I find any oviduct as described by Hutton. What 

 he supposes to be the commencement of the oviduct is the lower end of 

 the genital duct ; and serial sections in this region prove this to be so. 



Sections across the right side of the body show no trace of a duct 

 between the rectum and the genital duct, whereas sections across the genital 

 duct itself show the existence of a deep fold in its wall, which serves to 

 divide the duct into two portions, presumably, during the passage of the 

 ova and spermatozoa. 



Hutton (1879) says the eggs of Amphibola are " lodged on the exterior 

 of the mantle in a circular patch near the opening of the renal organ. 

 After fertilization they acquire a thick coat which gives them a bluish- 

 white pearly appearance." These are evidently the fluorescent particles I 

 described in connection with the kidney, where I mentioned that they were 

 products of the hypobranchial gland. They are not eggs, as I have 

 observed them in every animal without exception that I have examined 

 during the year. Moreover, they do not resemble eggs in the slightest 

 degree. 



In his second article (1882) Hutton says he found the oviduct so 

 distended with eggs that he was able to trace its connection with the 

 hermaphrodite duct. The "eggs" he found in the oviduct were, I think, 

 the eggs of a parasitic Trematode. I have found them several times, and in 

 some animals they are so numerous on the right side in the muscular region 

 of the body-wall between the rectum and the genital duct that both the 

 rectum and the genital duct are hidden from view — i.e., in the position of 

 Hutton's supposed '" oviduct." 



At present I am making systematic observations on Amphibola so as to 

 ascertain at what time the ova are laid and how they get to the exterior. 

 Every month I collect and preserve the animals in order to cut sections of 

 the reproductive organs and ascertain at what time of the year the eggs 

 are laid. If successful I shall try to follow out the development of the eggs 

 as far as possible. 



Fig. 7. — The end of a tentacle, with the eye, cleared 

 and mounted entire, c, carbonate of lime ; I, lens; 

 p, pigment ; /, tip of tentacle. 



Embedded in the connective tissue and amongst muscles in all parts of 

 the bod}', are numerous bodies composed of carbonate of lime. They are 

 extremely abundant, especially on the mantle-edge. They vary in size, 

 the smallest ones being found embedded in the base of the tentacle below 

 the eye (fig. 7). They vary in shape also, some being spherical, others 



