ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 297 



P, Myriopoda. 



Odoriferous Glands of Julus communis.* — G. Rossi describes the 

 minute structure of the flask-shaped glands which occur, one on each 

 side, in the pleural region of each segment — except the first four and 

 those which form the apodal terminal region. He describes the spherical 

 secretory cavity, the long neck-like excretory duct, the openings or 

 " foramina repugnatoria," the closing apparatus, and so on. A little is 

 said about the physical, chemical, and toxic properties of the secretion, 

 but it is difficult to get a satisfactory quantity. It is poisonous in sub- 

 cutaneous injection, but not when swallowed. 



New Myriopods.f — Carl Graf Attems gives in the first place an 

 account of a collection made in Java by Dr. Hjalmar Moller. It 

 includes ten new species and a new genus — Haplosomides, which agrees 

 with Haplosoma except in having twenty trunk-segments instead of 

 nineteen. Then follows a report on the collections made by Michaelsen 

 in Chili, by Plate and Burger in South America, and by Schauinsland in 

 various oceanic islands. A new genus — Dimerogonus — of Cambalidai 

 has a pair of flagella on the anterior copulatory appendages, and is 

 represented by two species ; three other new species are described. The 

 author then gives a systematic synopsis of the genera Oto stigma and 

 Cryptops, the former with three, the latter with four new species. The 

 concluding part of the memoir deals with twenty-two new and some 

 insufficiently described Palaearctic species. 



7. Prototracheata. 



Modes of Development in Onychophora. J — E. L. Bouvier discusses 

 the diversity of embryonic development exhibited by various forms of 

 Onychophora, and seeks in particular to show that the development of 

 South African species of Peripatopsis is linked by gradations to that 

 of Paraperipatus Nova Britannia. 



In Paraperipatus Nova Britannia and in Peripatopsis sedivichi the 

 segmentation results in a large ectodermic vesicle in which the em- 

 bryonic area, always markedly transversal, only occupies a small extent ; 

 this vesicle elongates considerably, is pedunculated anteriorly, and is 

 gradually reduced as the embryo develops. 



In Peripatopsis moseleyi there is again a large vesicle and a small 

 transversal embryonic area, but the vesicle does not elongate much, it 

 is never pedunculated, and by the absorption of its contents it simply 

 forms the walls of the median region of the body. 



In Peripatopsis capensis the segmentation results in a small ovoid 

 vesicle whose larger diameter does not exceed ■ 7 mm. ; the embryonic 

 area, much longer than broad, occupies the whole ventral surface of the 

 vesicle ; and the dorsal surface of the latter forms the back of the 

 embryo without ever showing the voluminous protuberance seen in 

 P. moseleyi. It is probable that other species will show states in which 

 the primary vesicle is more reduced than that of P. moseleyi and larger 

 than that of P. capensis. 



* Zeitschr. wiBB. Zool., lxxiv. (1903) pp. 64-80 (1 pi.). 

 t Zool. Jahrb., iviii. (1903) pp. 63-154 (7 pis.). 

 X Comptes Rendus, cxxxv. (1902) pp. 1033-6. 



