516 Transactions. 



but near the interior, where the coating is absent, it shows regular spiral 

 threads, which are closest along the exterior margin. Colour white, interior 

 pearly iridescent, with a well-marked white margin on the exterior of the 

 outer lip. 



Height, 77 mm. Major diameter, 84 mm. 

 ,, 80 mm. ,, 97 mm. 



A very distinct species, the occurrence of which in the Kermadecs is 

 as remarkable as that of Sputellastra kermadecensis, Cassidea royana, and 

 Spondylus raoulensis. Tectus royanus is allied to T. pyramus Born, an 

 Indo-Pacific species, but differs in colour and in sculpture, which is much 

 finer than that in T. pyramus. 



Habitat. — Sunday Island and Meyer Islet. Living on rocks from low- 

 water mark down to 6 m. or 8 m. ; fairly plentiful in places, but difficult to 

 collect. One or two live specimens were taken between tide-marks. 



Fossil. — A broken shell was extracted from a block of lava lying on the 

 shore on the east side of Sunday Island. The rock was identified as being 

 part of a lava-flow about 50 m. higher up the cliff. (Trochus sp. Oliver, 

 Trans. N.Z. Inst., 43, 531.) 



Trochus calcaratus Souverbie. 



Trochus calcaratus Souverbie, Journ. de Conch., 1875, 41, t. 4, fig. 7. 



Fossil. — Fragments taken from hard sandy tuffs of submarine origin on 

 Dayrell Islet, off Sunday Island, agree, so far as they go, with this species. 

 (Trochus sp. Oliver, Trans. N.Z. Inst,, 43, 527.) 



Distribution (Recent). — Lord Howe Island, Australia, New Caledonia, 

 Philippines. 



Clanculus atypicus Iredale. 



Clanculus atypicus Iredale, Pro. Mai. Soc, x, 225, 1912. 



Recorded, Iredale, I.e. 

 Habitat. — Living under stones near low-water mark, Coral Bay, Sunday 

 Island. On stones in rock-pools, Meyer Island. 



Clanculus stigmatarius A. Adams. 



Clanculus stigmatarius A. Adams, Pro. Zool. Soc, 1851, 161, 1852. 



Fossil. — One shell taken from hard sandy tuffs of submarine origin on 

 Dayrell Islet, near Sundav Island. Specimen not quite typical . (Clanculus 

 sp. Oliver, Trans. N.Z. Inst., 43, 527.) 



Distribution (Recent). — Australia, New Caledonia, Western Pacific, 

 Philippines. 



Solariella incerta (Iredale). 



Monilea incerta Iredale, Pro. Mai. Soc, x, 226, 1912. 

 Recorded, Iredale, I.e. 

 Habitat.- — Living among rocks between tide-marks, Sunday Island. 



Gena oliveri Iredale. 



Gena oliveri Iredale, Pro. Mai. Soc, x, 226, 1912. 



Recorded, Iredale, I.e. 

 Habitat. — Living among rocks near low-water mark, Sunday Island. 

 Very closely allied to a species in Norfolk Island, which differs prin- 

 cipally in having fine close spiral striae. 



