1896.] Zoology. 231 



thorax ; and twelve, the abdomen. At some time during the develop- 

 ment of the insect, appendages are present upon all except the first, 

 third and twenty-first segments. The frons, clypeus, labrum and com- 

 pound eyes are parts of the first segment. The second segment bears 

 the antennae, the fourth the mandibles, and the fifth and sixth the two 

 pairs of maxillae. The hypopharynx does not belong in the series of 

 appendages but is formed by a folding of the ventral portions of the 

 fourth, fifth and sixth segments. The cerci, contrary to the views of 

 some authors, are the true appendages of the twentieth (eleventh ab- 

 dominal) segment. Considerable emphasis is laid upon the similarity 

 between the first and twenty-first segments, in their relations to the 

 openings of the alimentary canal, in being free from appendages, in 

 the lateral position of their ganglia and in the relative changes of the 

 appendages of the adjoining segment. Concerning the position of the 

 genital openings, Heymons reiterates his former opinion that they may 

 belong primitively to the tenth segment, their position in the ninth 

 being a secondary development. — G. M. Winslow. 



The Coxal Glands of Thelyphonus caudatus.— In a brief 

 note in the Zoologischer Anzeiger, 2 Dr. Theo. Adensamer adds a few 

 facts to complete Sturany's work on the Arachnoidea. The two glands 

 occur between the gastric coeca and the muscles, and extend as un- 

 branched and unlobed sacs to the abdomen. From the anterior end of 

 each extends a simple duct to the coxae of the first pair of legs through 

 which they open. A thin chitinous intima was distinguished in the 

 ducts. An histologically differentiated portion of the gland corre- 

 sponding to Lankester's medullary substance and Sturany's Marksub- 

 sanz was not found. 



The following table shows the location of the openings of the glands 

 in the several groups : 



Limulut, openings in the 5th appendages. 



Scorpio, openings in the 3d pair of legs = 6th appendages. 



Pseudoscorpionidea, openings in the ? = ? 



Thelyphonus, openings in the 1st pair of legs = 3d appendages. 



Araneida: 



a. Tetrapneumous, openings in the 3d pair of legs = 5th append- 

 ages. 



b. Dipneumous, openings in the 1st pair of legs = 3d appendages. 

 Phalangida, openings in the 3d pair of legs = 5th appendages. 

 Acarina, openings in the ? pair of legs = ? — F. C. K. 



* XVIII, p. 424. 



