64 ME. GEOFFREY WATKIN SMITH ON THE 



similar shallow type with discoloured water. Owing to the ahsence of a boat I was 

 unable to explore it thoroughly. The littoral region of the lake seemed destitute of 

 Amphipods or Phreatoicus, but there were numerous prawns of the widely distributed 

 Xiphocaris compressa. The plankton was well-developed and consisted of the two 

 Cladocera Bosmina sorelli, sp. n. (PL 16. fig. 2), and Oeriodaphnia planifrons, sp. n. 

 (PI. 15. fig. 17), and the Copepod Boeckella longisetosa, sp. n. (PI. 17. fig. 13), belonging 

 to the Diaptomida?. 



Lake St. Clair is very different in type to the other Tasmanian lakes, being exceed- 

 ingly deep (in places 600 ft.) and the water absolutely clear and ice-cold. The elevation 

 is about 2500 ft. The dredge from the deep holes brought up absolutely nothing but 

 fine mud. Pound the sandy margins the widely distributed Amphipod Chiltonia 

 australis was common. The plankton, which was exceedingly rich, cousisted of 

 Bosmina rotunda, sp. n. (PI. 15. fig. 18), Ceriodaphnia hakea, sp. n. (PI. 15. fig. 10), and 

 the Copepod Boeckella longisetosa. 



lit. Wellington. — On the flat top of this mountain, at about 4000 ft., are numerous 

 small pools of clear water which never completely dry up, with blackish mud at the 

 bottom of them. In these pools the common Phreatoicus australis is abundant and 

 with it the little yellow Amphipod Neoniphargus montanus (Thomson). 



In a few of the deeper pools the mountain shrimp Anaspides tasmanian is met with, 

 but this species is found in greater abundance in the deep pools of the mountain torrent 

 which rises on the top of Mt. Wellington and flows down into the North-West Bay 

 River. It does not occur, however, in this river below the Wellington Palls at about 

 2000 ft. In the little rivulets which everywhere course down the sides of 

 Mt. Wellington several Amphipods are found under the stones, viz. Neoniphargus 

 wellingtoni and Gammarus morloni. 



Pound the base of the mountain in the smaller branches of the streams the smaller 

 species of crayfish or freshwater lobster, Astacopsis tasmanicus, is found, though not so 

 abundantly as formerly. 



BZarz Mountains. — These mountains lie at the extreme edge of the greenstone country 

 bordering on the West Coast Mountains. Near the top are several large and very deep 

 tarns of clear water : in them Anaspides tasmania? is very abundant, and round the edge 

 a little black Amphipod, Neoniphargxis niger, sp. n. (PI. 15. figs. 1-1). The plankton 

 consists of a very numerous bright red Copepod, Boeckella rubra, sp. n. (PI. 18. fig. 1), 

 only found in these tarns and in similar tarns on the West Coast (Mt. Read). 



Mt. Field has similar tarns to the above, which, however, I did not visit. Anaspides 

 tasmanice is found here. 



Ben Lomond. — On the top of this mountain, at an elevation of about 4000 ft., is a 

 shallow lake, Yule's Lake, in which are very numerous Phreatoicus australis and 

 Neoniphargtis yuli (PL 13. fig. 1). 



Adventure Bay Lagoon, Bruni Island. — This is a large shallow freshwater lagoon, 

 only separated from the sea by a line of sand hummocks. The water is, however, 

 perfectly fresh, and the water-weeds and fauna are typical of freshwater. Phreatoicus 

 australis was abundant here — a curious fact, since otherwise the genus is found only at 



