78 NATURAL HISTORY 



are white and opake, appearing as if covered with a fine white 

 powder 1 . 



The nerves are like those in the silk-moth while it is in the cater- 

 pillar state. They go down the belly to the end, consisting of two 

 small strings, and small round opake bodies placed at equal distances, 

 upon the beginning of each scale of the abdomen. These white bodies 

 or ganglions give off nerves on each side. In passing down the abdo- 

 men it goes over the division of the vagina [in the female], and a 

 ganglion is placed upon the division which binds the vagina down close 

 to the under part of the abdomen, giving off nerves to the termination 

 of these parts. 



The three eyes [ocelli] on the head project above the skull like half 

 globes ; they are shining black, and are fixed in the skull. "When 

 viewed in the microscope they appeared polished and black, but on re- 

 moving the projecting part it appears transparent. They are hollow, 

 and the lower part is sunk in the skull, at the bottom of which is a 

 little fluid, and lined with a black part like the ' pigmentum nigrum ' 

 in the eyes of the more* perfect animals, which gives them their black 

 colour. 



Male Parts of Generation. — The males may be easily distinguished 

 externally by the above description. The penis, <fcc. is like that of the 

 silk-moth. It is seeured in a strong brown shining horny case, about 

 the size and shape of a barley-corn, with two blunted hooks which bend 

 downwards, with a sulcus in the upper part in which the penis lies. 

 This case consists of two parts joined together above and below, with a 

 tough union. At the end are the two hooks above mentioned, each of 

 which open and shut, like forceps ; probably to secure the female in the 

 act of coition, like the hooks in the male silk-moth. These hooks project 

 beyond the penis near the breadth of a pin. The case has muscles at- 

 tached to it, by which the male can make it project and draw it in. The 

 penis lies in the sulcus or groove and is about one-eighth of an inch in 

 length, about the thickness of a common pin, is rather flat, of a light- 

 brown colour, darker towards its end. At its end, it has two small 

 projecting parts on each side, going off obliquely : they are thin, homy, 

 and are smaller at their attachment, suddenly swell out, and are rounded 

 off in an oval form. On the under side of the penis is a groove in 

 which the duct for the conveyance of semen passes, which opens at 

 the end between the two above-mentioned projecting parts. The penis 

 seems not to be capable of being pushed out far ; for I have never been 

 able to draw it out more than the breadth of a hair-pin 2 . The testicles 



1 [Hunt. Preps. Nos. 1073-1079.] 2 [Hunt. Prep. No. 2349.] 



