FIG. 
- Pseudo-spiracle of Epeira cancriformis. Vou. UL. p. 715. 
- Part of the ventral segments of the abdomen of Lyveus 
2. 
4. 
bo | 
TO: 
11. 
EXPLANATION OF THE PLATES. 601 
compressipes. a. Pseudo-spiracles, 
. Portion of dorsal segments of Dytiscus marginalis, to 
show the large anal spiracles. Vow. IV. p. 42. 
. Plumiform gills in the mouth of the spiracles of the larva 
of Cossus ligniperda. (Sprengel.) 
PLATE XXX, 
- Brain, spinal chord and ganglions of a full-grown cater- 
pillar of Pieris Brassice. a. The brain. b. The dou: 
ble spinal chord. cd, Ganglions with a portion of their 
nerves. 
Brain, spinal chord and ganglions, after two days, when 
the chord is shortened. 
when the animal is 
become a pupa. 
when it has been a 
pupa szx days. 
just before it assumes 
the imago. 
when it has become 
a butterfly. Vor. 1V. p. 24—. 
» Intestinal canal of the caterpillar. a. Saliva vessel. 6. Silk 
reservoir. c.Gullet or @sophagus. d.Stomach, eee. Bile 
vessels. f. Large intestine. g. Rectum. 
after it has assumed the 
pupa two days. 
after ezght days. a. Crop 
or honey-stomach, first showing by the dilatation of the 
base of the cesophagus. 
a. Honey-stomach be- 
come a lateral appendage of the cesophagus 6. 
of the butterfly. a, Honey-stomach. 
6, C&sophagus, c. Small intestine become very long. 
d. Rectum. Vot. IV. p. 112. 
