June,! Excursion to Lake Corangamite and District. 27 



organisms were found in it. In the depression over the ridge 

 to the south of the Basin the water had dried up. Samples 

 of the mud from its bed were secured for ''hatching" pur- 

 poses at home. Further south is the largest of this group of 

 small lakes — Lake Purdiguluc. It appears to be very shallow, 

 and the effect of the dry spell was marked by the shrinking of 

 its surface, leaving stretches of mud-flats along its shores. 

 The fauna of this lake consisted of a Copepod, Boeckella sym- 

 metrica, and a few rotifers, the muddy shores making collecting 

 very difficult . To the west of Purdiguluc is Lake Gnalinegurk, 

 and, though the distance separating the two is not great, it 

 is of considerable height and steepness, and, after the climbing 

 already undertaken, I did not feel physically fit to negotiate 

 it when I remembered I was a mile and a half in direct line 

 from the lunch camp, and between it and me were a number of 

 ridges to be crossed, with a final climb of two hundred feet over 

 Coragulac Hill ; so reluctantly I retraced my steps. The 

 general impression formed of these lakes was that, though their 

 waters contained great numbers of specimens, the number of 

 species was small. A visit to the lakes in early spring might 

 furnish a greater number of species. 



The most interesting of the lakes was the one to which the 

 excursion owed its origin — Lake Corangamite — for in its waters 

 was taken a Copepod which will be the type of a new genus, 

 of which there are probably two species. The specimens 

 captured near the shore were slightly smaller, and on the fourth 

 thoracic segment, on the dorsal side, the females have a short 

 projection. Those taken with the tow-net half a mile or so 

 from the shore were deeper in colour, slightly larger in size, 

 and the females did not possess the dorsal spine already 

 alluded to. It is proposed, provisionally, to call this genus 

 Heterotemora, and a full description, with figures, will be 

 furnished in clue course. Another interesting " find " in this 

 lake was an Isopod, certainly undescribed for Victoria, and 

 probably new to science. Its capture was the result of 

 inductive reasoning. Along the lake shore and in the shallow 

 water Dottrel were observed. As the netting operations 

 captured nothing larger than Copepoda, and the algae on the 

 rocks sheltered Ostracoda and the little univalve mollusc 

 Cociella striatula, curiosity was aroused as to what the Dottrel 

 found to eat. Selecting a rock on the shore where one could 

 kneel without getting unduly wet, the muddy bottom of the 

 lake was scrutinized for any appearance of living creatures. 

 Finally our patience was rewarded by observing a movement 

 just under the surface of the fine silt, and the quick insertion 

 of the fingers resulted in the capture of an Isopod. Twenty 

 minutes' close search was rewarded by the capture of eight or 



