HORN EXPEDITION — SUMMARY. 155 



some doubt, ill the case of Lcpidunis aiigasi) the iSoutli Australian Lcpitlurus are 

 referable to one species, L. kiiigii* 



Amongst the Limnadiacke the genus Estheria is represented by three species 

 of wiiicli one, E. packardi^ with its three varieties tvpiai, canccllata and minor, is 

 by far the most abundant and is widely spread over the Lower and the Higher 

 Steppes, occurring in every water-hole except the cold, deep and clear pools 

 amongst the ranges. Tlie various species of Limiiadiad;e all seem to requiie 

 muddy water for their existence and long after the others have died out (exci'pt 

 perhaps an occasional E. liitraria) and are represented by empty carapaces, E. 

 packardi in one or other of its vai'ieties will be found sur\'iving. EstJwria Iii/raria, 

 described originally by Brady from a single dried carapace secured by Professor 

 Tate from Cooper's Creek, is coiilined to the water-holes of tlie Lower Steppes, 

 whilst Eslheria dictyon was only secured along the Palm Creek in the James 

 Range, t 



Limnadopsis is a new genus " distinguished from Estheria by the presence of 

 a haft-organ ; from Limnadia and Eulimnadia by the spinous processes on the 

 dorsal edge of the carapace, l)y the diflerent number of lines of growth and of 

 pairs of feet ; from Limnadella by the diti'erence in size of tiie two pairs of 

 anteniue."! Tiie larger species of this genus (Z. sqiiirei) measures fully three- 

 quarters of an inch in length and is probably the largest of the living Estheriaiue. 



Amongst the Ci'ustacea the genus forms the iiujst distinctive type in the 

 Central region, though it is also represented in the Nortliern T(!rritory by a species 

 (Z. bninnciis) of which carapaces were coUectctl by Professor Tate near Port 

 Darwin. 



In the Macroura the single species Astacopsis Inairinatm is widely distributed 

 over Australia. It apparently owes its wide distributi(jii to its capacity for 

 burrowing. 



In the Brachyura the occurrence of Telphma transversa is a striking feature. 

 It only occurs in the water-holes amongst the Lower Steppes and was not met 

 with ill the Higher Steppes or anywhere along the Finke Iliver. There can be no 

 doubt as to its identity with the form described by Professor Haswell from 

 Thursday Island. In all likelihood it will yet be found in the interior of 



* This statumuiit is based upon a uaicful Lxaiiiinatioii liy Mr. Hall and iii.vsrlf of a lai-,.;c siiius of forms li-oiii 

 various localities. 



t This species occurs also in the coUeclioi] of tlie South .\ustralian .Museum, labelled only "S. Australia." 

 \ Oeolo^iieal Heiiort, I'art III., ]). 239. 



