INVERTEBRATA, CRYPTOGAMIA, MICROSCOPY, ETC. 69 



the numerous micropyles, wliicli looks hacJcwards wlieu iu tlio oviduct, 

 rests in the side of tlie capsule, and thus has an outward aspect. 



The exposition of the arrangements by which the ova are moved, 

 the complete history of the formation of the caj)sule, and the mor- 

 phological importance of the chitinous generative organs are postponed 

 for a future communication. 



j3. Myriapoda. 



New Genus of the GeopMlidse.* — A new genus, Bothriogaster, is 

 instituted by Dr. Sseliwanoff to include the already known form 

 Geophilus signatus Kessler, and two new species, to be called B. affinis 

 and B. Meinerti, belonging to this group of Chilopodous Myriapoda. 

 They are characterized by a dej)ressed form ; the head-plate entirely 

 covers the mouth-organs above ; there is no distinct frontal plate ; the 

 upper lip is not divided, and carries teeth ; and the mandibles have one 

 toothed and several comb-like lamellas. The maxilla) are bi-arthrous ; 

 the lower lip is not dentate ; the claw of the second maxillipede has no 

 accessory tooth ; and the outer prasscutella are much larger than the 

 stigma-plates. The pleural pores are numerous, and lie in four deep 

 cavities on the ujipcr and under surfaces ; there are no anal pores ; 

 the anal feet are six-jointed, unarmed. Some apposed ventral plates 

 present a strong horseshoe-shaped depression in their front edge. 

 The last ventral shield carries a deep median groove ; the male genital 

 palps are two-jointed. 



B. signatus is from 70 to 145 mm. long, the head and frontal jdatea 

 together are broader than long — it occurs at Samarcand. B. ajjinis 

 is from 72 to 102 mm. long, the head and frontal plate together of the 

 same length as breadth — from the Caucasus and Sarepta. B. Meinerti 

 agrees with the latter in its head and frontal plate characters ; the 

 length of the body is from 91 to 96 mm. It is of a briglit yellowish- 

 brown colour-, whereas the other species are pale yellow — from 

 European Turkey. 



y. Arachnida. 



Hydrachnidse of the Lake of Geneva.f — In one of the contribu- 

 tions to the knowledge of the fauna of this lake, published under the 

 direction of Dr. Forel, M. Lebert describes the comparatively largo 

 number of these forms which occur there. They exhibit three states 

 of distribution : Littoral (to a depth of 8 metres) ; Deep (from 20 to 

 300 metres) ; Parasitic, on Anodonta. Of these, the littoral claims 

 the larger number of species. They are remarkable for their gene- 

 rally dull coloration, although some striking exceptions are mentioned 

 below. In common with, he considers, all Ilydrachnida), they liavo 

 two pairs of eyes, sometimes confluent, whose characters are valuable 

 aids to classification. The presence of a circum-genital area provided 

 generally with peculiar disks, formerly described as suckers, is con- 

 stant for most species which have been examined as to this point ; the 

 disks occur mostly to the number of six, and being in the majority of 



* ' Zonl. AnzciKcr,' ii. (1879) p. G20. 



t ' bull. iSoc. Vuud. Sci. Nut.,' xvi. (18711) !>. o27. 



