ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



77 



Morphology of Scolopendrella.* — Prof. B. Grassi gives a detailed account 

 of Scolopendrella, in its systematic, geographical, and anatomical relations. 

 The afiiuities of Scolopendrella with Pauropodi, with fossil myriopods, with 

 Ohilopoda and Diplopoda are discussed. In none of these orders can 

 Scolopendrella be incorporated. Without as yet definitely stating the sys- 

 tematic position of Scolopendrella, Grassi advances various arguments in 

 favour of relationship with Machilis, Japyx, Campodea, &c. 



S. Araclinida. 



Affinities of Araclinida. t — Herr W. Scbimkiewitsch discusses the limits 

 and relationships of the Arachnida, with a critical review of the history 

 of opinion and investigation on this subject. (1) Haller's separation of the 

 Acarina he regards as sufficiently answered by Cronenberg. (2) The 

 proboscis of the Pycnogonidse he compares to the rostrum of spiders ; the 

 mandibles are the homologues of the chelicerae; and the four pair of appen- 

 dages in the two types also correspond. As to the palps and oviferous 



Aberrant Forms. 



The number of unjointed appendages and stigmata by which the bundles of 

 tracheae open, corresponds to that of the segments of the body. 



appendages, the former are comparable to the palps of spiders, while the 

 latter perhaps arise from modified- development of the maxillary endopodium. 

 The Pycnogonidse are at once primitive and arrested forms. (3) In regard 

 to the LinguatulidaB and Tardigrada, the author does not consider Graff's 



* Mem. E. Accad. Sci. Torino, xxxvii., 2 pis. Cf. Rev. Ital. Sd. Nat., ii. (1886) 

 pp. 51-4. 



t Arch. Slav, de Biol., i. (1886) pp. 309-19. 



