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PROCEEDTNGS OF THE NATIONAL MUSEUM. 



VOL. XXVIII. 



Dana; ]>ut the latter are, of course, mistaken in interpreting- the gland 

 itself as nervous tissue. Furthcn-niore, the second nerves in Odltgux 

 eui'tus (tig. 2S, 2), which Pickering and Dana are describing, go, not to 

 the terminal joints of the first anteniue, but to the frontal plates, and 

 thus correspond with the tifth pair descril)ed by Scott. The pres(Mit 

 author has not had an opportunity to examine either of the species 



described by these authors, but from 

 an examination of other species of both 

 genera it is fairly certain that the 

 branch spoken of comes from the sec- 

 ond pair of nerves, although its desti- 

 nation may vary slightly in different 

 genera. The remaining third pair of 

 nerves (o) arise from the angles of the 

 ganglion outside the second pair and 

 pass to the second anteim;e. They are 

 larger than the second pair, which 

 would seem to indicate the importance 

 of these second antenn;e as organs of 

 prehension. In their passage to the 

 second antennse these nerves pass under 

 the second pair. 



These are all that are given oti' l)y 

 the upper ganglion. From the frontal 

 and lateral margins of the lower gan- 

 glion arise seven pairs of nerves, while 

 three other pairs are given off from 

 the posterior end and form a sort of 

 spinal cord, thus making- thirteen pairs 

 in all (lig. 3S). The ten pairs from the 

 lower ganglion supply the remainder 

 of the appendages and the bod}' nuiscles. 

 The lirst of them, the fourth pair (4) 

 in sequence, arise near the center of 

 the anterior margin, and pass along the 

 muscles of the oesophagus until they 

 reach those of the mandibles near the 

 l)ase of the mouth. We have already 

 stated that the mandible muscles were surprisingly large. These 

 nerves arc also of good size. 



The lifth pair (5) have their origin near the anterior angle of the 

 ganglion and pass forward to innervate the frontal plates, running 

 under the luM'ves going to the first and second antenna'. 



Three other pairs, the sixth, seventh, and eighth, arise close together 

 in L, jh()]>]it]i< iriis at the anterior angle just outside the fifth pair. 

 The sixth pair (0) imiervates the lirst maxilli\?, the seventh (7) the 



Fi(i. is. — Nehvous systeji of a CALira's. 

 (After Pickering and Dana.) 



