Geology. 349 



represented in the Trenton by a very closely allied species " (p. 

 562). Thirteen new species are described. c. s. 



6. A J\ T eio American Ci/bele ; by J. E. Narraway and P. E. 

 Raymond. Ann. Carnegie Mus., iii, July, 1906, pp. 599-604.— 

 In America, this genus of trilobites is always rare and entire 

 examples are almost unknown. The writers describe a nearly 

 complete specimen preserving all the essential characters. It is 

 named Cybele ella, and occurs in the Black River limestone of 

 the Ordovician, near Ottawa, Canada. c. s. 



7. Tiber Phylogenie der Artliropoden ; by A. Handlirsch. 

 Verb., k. k. zool.-bot. Gesellsch. Wien, 1906, pp. 88-103. — For 

 several years, Handlirsch has had in preparation an octavo work 

 entitled "Die Fossilen Insekten und die Phylogenie der Rezenten 

 Formen,"* now being printed by Wilhelm Engelmann in Leip- 

 zig. From this work has resulted the paper under review. 



The writer holds that the Arthropoda are monophyletic ; that 

 Peripatus stands much closer to the worms than to the true 

 Arthropoda, and can not be regarded as the link uniting branchi- 

 ate and tracheate Arthropoda. The stem group for all Arthro- 

 poda, he holds, must be sought among the trilobites. From 

 these the Crustacea were first differentiated. The Arachnida 

 are united with the trilobites through the limuloids, and with 

 these the eurypteroids are closely related. The myriopods are 

 seemingly difficult to derive from trilobites, but in the Carbon- 

 iferous are many myriopod-like forms, the majority of which had 

 a relatively broad and large head, with well-developed, large 

 compound eyes like those of trilobites. Many of these forms 

 were broad and had short segments in moderate numbers; some 

 even had distinctly marked pleural parts quite similar to those 

 in trilobites. 



" From all these facts it seems Clear that the primitive forms 

 of myriopods were also relatively broad animals with homono- 

 mous segments, compound eyes, and cloven feet, living at least 

 part of the time in water, and gradually adapted their breathing 

 organs to a land existence. If we assume that the trilobites 

 possessed nephridia on all segments, it is easily explained how in 

 the very beginning two diverging myriopod-like stems origi- 

 nated, one of which had adapted the segmental organs situated 

 far to the front, the other those far to the rear, to the service of 

 sexual parts. In this event, the Progoneates and the Opistho- 

 goneates are to be regarded as independent phyla" (p. 91). 



This paper is of great interest to all students of the Arthro- 

 poda. c. s. 



8. Die Entwichelung von Indoceras baluchistanenense Noet- 

 ling. Ein Beitrag zur Ontogenie der Ammoniten ; von F. 

 Noetling. Geol. u. Pal. Abh., Jena, viii, n. ser., 1906, pp. 1-96, 



* Die Fossilen Insekten und die Phylogenie der Eezenten Formen. Ein 

 Handbuch fur Palaontologen und Zoologen ; von Anton Handlirsch. I. 

 Lieferung (mit 9 Tafeln). Pp. 160, Leipzig, 1906 (Wilhelm Engelmann). 



