32 



Linnean Macleay Fellow of the Society in Zoology. — From a study of 

 Lììiuiobdcìla, Orobdclla, I'ontobdeUa^ 0\ohraiic]ius, Semilacjcncta, Philacmon 

 and Geobdclla, the author concludes that, in the process of somite-extension, 

 the posterior region of the sensory somite is the first to be affected. Further 

 divisions may concern the posterior region exclusively, as in SemUagencta 

 and ficobdcUa', but in the majority of cases the anterior region is found to 

 be similarly affected. The fact that the division can be proved to be restricted 

 to the posterior region in some forms, is not astonishing; and in as much 

 as considerable variation takes place in the evolution of the multiannulate 

 condition of the somite, is but to be expected. In the majority of forms, 

 however, the anterior portion of the somite is first affected after the addition 

 of the first posterior annulus. Later divisions typically involve both extremi- 

 ties, or in some cases may be restricted, at least for a time, to the anterior 

 extremity. Examples of the latter are to be found in those leeches in which 

 the adult somite is tetrannulate. After the formation of terminal non-sensory 

 annuii, the sensory annulus is, as a rule, not affected, but sometimes it is, 

 as a result of the inability of the terminal annuii to undergo further division. — 

 2) Contribution to a Knowledge of Australian Hirudinea. Part, VI. The 

 Distribution of Hirudinea, with special reference to Australian forms, and 

 remarks on their Affinities, together with Reflections on Zoogeography. By 

 E. J. Goddard, B.A., 15. Sc, Linnean Macleay Fellow of the Society in 

 Zoology. — From a distributional point of view the terrestrial genera, 

 Pidlacmon and UeobdeUa, are perhaps the most important members of the 

 Australasian Hirudinea. Both forms are distinctly archaic. In Geohdella 

 the penultimate somite has been derived from the uniannulate segment by the 

 addition of four annuii posterior to the primitive ring; whereas in Pitilaetnon 

 the sensory ring is denoted by the third annulus of the tetrannulate somite, 

 indicating that the order of origin of the annuii is different. Hence it is 

 conchided that they have been derived from a common ancestor which agreed 

 very closely with them in regard to the jaws, position of the eyes, and general 

 anatomy, but which, at the time these two genera were differentiated, had 

 not developed a somite of more than two annuii. — 3j Revision of the genera 

 Sympctes and Hclaeus: with Descriptions of new Species of Tenebrionidae. 

 By H. J. Carter, B.A., F.E.S. — Two species oï Si/))ij)rf(fi are listed in 

 Masters' Catalogue, and Lea added two additional species in 189G. The 

 names of two of these are considered to be synonyms, while S. magistcr Pasc, 

 is wrongly included in the genus. Ten species, erroneously ascribed to 

 SaragnSj are restored to Sympetes, and three are described as new. The cata- 

 logued species of IMacus have been identified by reference to European 

 collections, U. jicrroniiBoisd., being shown to be synonymous with. If. faira- 

 /n.s- Pasc, and ten species are described as new. In addition, three species of 

 PteroJiclacns, two oîSaragu.-i^ two oï Agasthnics^ and one of Adcliuni are 

 proposed as new. 



Druck von Brcitkopf à. ][|irtcl in Leipzig. 



