TABLE OF THE PLATES. XXV 



INSECTA. 



Plate b6. Fig. 3. — Cerebrum of the caterpillar of Cossrs lismpekda, Lyonet. 

 E, E. — Branches to the frontal ganglion. 0. — Nerve of the 

 muscles of the mandibles, b, b. — Nerves of the antennae. 

 a, a. — Nerves of the eyes, c c. — Cord of the cesophagug. 

 P, P.— Nerves of muscles. A, A. — Small ganglion of the 

 sympathetic nerve. B, B.— Branches. F. — Nervus sympa- 

 thicus. 



Fig. 4. — Brain of Melolontha vulgaris, Straus. A.— Cerebrum. 

 B. — Cerebellum, a, a. — Optic nerves, b, b. — Nerves of the 

 antennae, d, d. — First ganglion of the sympathic system. 

 G, G. — Second ganglion. D. — Frontal ganglion. e, e. — 

 Nerves of the mandibles. /,/ — Nerves of the maxillae. 



Fig. 5. — Cerebellum alone, of Melolontha vulgaris, e, e. — Nerves of 

 mandibles. /;/. — Nerves of maxillae. A, A. — Connecting cord 

 with the cerebrum, h, h. — Connecting cords to the first tho- 

 racic ganglia. 



Fig. C. — Cerebrum of Gryi lus migratorics, with the sympathic svstem 

 seen from above. A. A.— Optic nerves. B, B. — Nerves of 

 the antennae, a. — Frontal ganglion, b. — First ganglion, in 

 which the odd nerve terminates, c, c. — The large ganglia. 

 «!«• — The small ganglia, whence the sympathic nerve originates 

 by two branches, which again unite at rf* and d*. e, e. — 

 Small ganglia upon the oesophagus. /,/. — First ganglion upon 

 the crop, g, g. — Second, which lies at the end of the crop. 

 h, fc.— Nerves which pass between the blind appendages. 



Fig. 7. — Brain of Gkyllus migratorius, seen from the front. A, A. — 

 Optic nerves, a, a. — Nerves which pass to the frontal gang- 

 lion, b, b. — Nerves of the antennae, a*, a*, a*. — Nerves to 

 the ocelli, d, d. — Connecting cords betvTeen the cerebrum 



and cerebellum, d*. — The connecting cord of these. B- 



Cerebellum, e, e, — Nerves of the mandibles. /,/. — Nerves 

 of the maxillae. 



Fig. 8. — Ventral cord of the fly Eristalis tenax. a, a. — Connecting 

 cords with the cerebellum. A, A. — Nerves of the anterior legs. 

 B, B. — Of the intermediate, C, C— Of the posterior. 6,6.— 



Branches of the muscles which pass into the abdomen, d. 



First abdominal ganglion, c, c. — Branches of it. e. — Second 

 abdominal ganglion. f,f, h, h, g, ^9.— Branches of it to the 

 genitalia and other internal organs.' 



Plate 87. Fig. 1. A. — Brain of the larva of Calosoma sycophanta. A. — Cerebrum. 

 a, a. — Optic nerves. 6, 6. — Nerves of the antennae, d, d. — 

 Branches to the frontal ganglion. D. — Frontal o-anirlion. 

 F. — First ganglion of the sympathic system. B. — Cerebellun-. 

 c, e. — Nerves of the mandibles. /,/. — Nerves of the maxillse. 

 g, g, — Nerves of the labium. 

 Fig. I. B.— Part of the ganglionic ventral cord of the larva of Cai.oso.ma 

 sycophanta. A-. — Cerebellum, h, h. — Auxiliary connecting 

 cord, with the first thoracic ganglion, n. n. — Auxiliarv gan^^l 

 lia. A, A. — Nerves of, the anterior legs. L. — First thoracic 

 ganglion, i, i. — Auxiliary connecting cords of the first and 

 second ganglia, forming small ganglia, vi m. k, k. — Au.xiliarv 

 connecting cords between the second and third ganglia. W", 

 — Second thoracic ganglion. N.— Third. O. — Fourth, p, p, 

 ?. 9. n T". '♦, i.— Nerves of muscles. B, B.— Nerves of the 

 intermediate legs. C, C. — Nerves of the posterior legs. 

 Fig. 2.— The ventral cord of Dytiscus marginalis. A, A. — Nerves of 

 the anterior legs. B, B.— The intermediate ones. C, C— 

 The posterior ones. 



