Or.ivKK. — (U'uliKiii (if the Kcrrnadec iRlaufln. 



525 



Speight's paper, and the corresponding numbers of the specimens are 

 quoted in every case. For much lielp freely given I beg now to tender 

 my sincere thanks to Mr. Speight. 



Sunday Island — Physical Features. 



Sunday Ishmd is roughly triangular in shape. Its greatest length is 

 l()-5 km., and its area 29-25 sq. km. The present crater, oblong in shape, 

 the longer diameter being about 3-3 km., occupies a large portion of the 

 island, and contains three lakes (fig. 1 and Plate XXIII). From the crater- 

 rim there branch off three main ridges — one runs north-west from Expe- 

 dition Hill to Hutchison Bluff, another south-west from Mount Junction to 

 Smith Bluff, the third south-east from Mounioukai to the east coast. These, 

 with their ramifications, form practically the whole of Sunday Island. 



With the exception of some level ground in Denham Bay, in the crater, 

 and on Low Flat and the adjoining Terraces, the whole of the surface of 



Napier Islet O '^l^fgent Islet 



((^Dayrclll. 

 <!^ HERALD ISLETS 



O 

 Chanter " 

 Islets Ir 



"•T) 



za' le' s. tat. 



Smith Bluff M, 



SCENERY BAY 



x~~J]r_/^ iVilson Point 



Mas/i Point 



SUNDAY ISLAND 



En^hsh mile-.. 



Fig. 1. 



Sunday Island consists of a series of narrow ridges and deep ravines. High 

 cliffs are frequent both along the coast and inland. This extremely rough 

 island, which, though small, is difficult to travel over, has by the action 

 of sea and rain been modelled out of a volcanic cone composed mainly of 

 pu^mice and other andesitic tuffs. 



Green Lake appears to have been the centre from which the last out- 

 liursts of volcanic activity proceeded. The water is of a dark bottle-green 

 colour, and has a strong alkaline taste. 



At the foot of Expedition Hill is a small sheet of fresh water known as 

 Tui Lake, hidden in the forest. It is difficult to give reasons for the presence 

 of this lake, as, on account of the porous nature of the soil, nowhere else 

 on Sunday Island does water lie in small hollows. 



Blue Lake, which is nearly circular in outline and very shallow, lies 

 between the small or inner crater-ridge surrounding Green Lake and the 



