40 Arachnida für 1910. 
TPilgrim, 6. Preliminary note on a revised classification of 
the Tertiary Freshwaters Deposits of India. In: Rec. geol. Surv. India 
40. p. 185—205. — Pedipalpi. 
Pinkus, Felix. Tierische Parasiten der Haut. In: Med. Klinik. 6. 
p. 1508—1509. — Pediculoides. Demodex. 
TPocock, R. J. Notes on the Morphology and generic Nomen- 
elature of some Carboniferous Arachnida. In: Geological Magazine 
(Dec. V) 7. p. 505—512. — Oprliotarbus n. g. pro Architarbus elongatus. 
Poliansky, J. Zur Embryologie des Scorpio indieus. In: Trav. 
Soc. Nat. St. Petersbourg, Sect. Zool. et Phys. T. 32. Livr. 4. p. 43 
—55. 1 fig. (Russisch!) und p. 83—91 (Deutsch!) (1904). 
Puhlmann, E. Einführung fremder Tiere in die Fauna Krefelds. 
In: Mitt. Ver. f. Naturk. Krefeld 1910 p. 60. — Als eingeführt wurden 
beobachtet: Mit Farbhölzern aus Südamerika ‚15 Arten Arachniden, 
darunter die große Vogelspinne‘“, mit aus Hinterindien eingeführten 
Gerbmaterialien, „Spinnen“. 
Purcell, W. F. The Phylogeny of the Tracheae in Araneae. In: 
Quart. Journal Microsc. Sci. 54. p. 4 p. 519—563. pl. 28. — Caleulus 
n. g. Oonopidarum n.sp. Interpulmonary folds of Thelyphonus. Respi- 
ratory segments of Dysderidae. Oonopidae, Caponiidae described 
(respiratory organs, muscles, tendons, genital ducts, receptacula). 
Tracheae of Desis (marine spider). Errata to paper on Development 
and Origin of Respiratory organs in Araneae ıbid. Vol. 54. p. 564. — 
Autorresum&: „In the first place I suppose the saccules of the second 
pair of lung-books to have been converted into tracheal tubules in the 
common ancestor of the Dysderidae, Oonopidae and Caponiidae. 
The resultant tracheae then increased in size, and, as the number 
of the leaves of the anterior lung-books decreased in inverse ratio, 
the former became the principal organs of respiration. "The second pair 
of spiracles retained their position, or may even have moved slightly 
forwards, and the conversion of the entapophyses into tracheae could 
not take place here, and would, moreover, be quite unnecessary. In 
the Caponiidae the anterior pair of lungbooks were converted into 
tracheae in a similar manner, but at a later period, and independently 
of the conversion of the posterior pair; but as the latter already provided 
almost the entire body with tracheae, the anterior pair did not further 
increase in size. 
In the second place, in the progenitor (or progenitors) of the 
remaining tracheate spiders, the posterior lungbooks became reduced 
in size and effectiveness by the disappearance of their saccules, accom- 
panied by an increase in the number of the leaves of the anterior lung- 
books. Further, the posterior spiracles became approximated and 
united to a single spiracle, and moved towards the hinder end of the 
body, thereby causing the entapophyses of the tracheal segment to 
elongate. In this condition the Filistatidae, Sicarıidae and Palpimanidae 
have remained, with slight modifications, such as the division of the 
tracheal antechambers into branches in some forms. In the great 
majority of the families, however, the elongated apophyses became 
