688 ME. A. W. WATEES ON" MEMBEANIPOEID^. 



described by Busk shows that it bas this peculiar operculum and 

 corresponds in other respects. Although Busk's name hag 

 priority, the fact that it has been impossible to recognize the 

 species with certainty from the figure and description must be a 

 sufBcient reason for retaining the name given by Hincks. I have 

 both unilaminate and bilaminate forms in my collection. 



This is closely allied and probably identical with the fossil 

 M. appendiculata, Eeuss, as found fossil in Bairnsdale (Australia) 

 and the Miocene of Europe ; and in the Bairnsdale specimen 

 there seems to be a slight shelf for the operculum. However, as 

 we cannot be quite certain as to some of the characters of the 

 fossil, it would seem better to retain both names for the present. 



Log. New Zealand. 



Membeanipoea peemunita, Hincks. 



In having the space above the avicularium unoccupied and 

 destitute of a membrane it corresponds w^ith M. curvirostris, 

 though in having the lamina turned downwards it corresponds 

 with M. Savartii, M. hidens, M. patellaria, <fec., while the growth 

 of the avicularian chamber would suggest placing it with Oiiy- 

 cliocella. A suggestion made in a previous paper that this species 

 is the M. Micliaudiana, d'Orb., cannot now be maintained. 



I have a specimen in which one avicularium has a very abnormal 

 growth, as there is a double beak to the mandible, each beak 

 being curved in an opposite direction. 



Membeakipoea imbeicata {Bush). (PL 48. fig. 13.) 



Ampliiblestrum imbricatum, Busk, ' Challenger ' Report, vol. x. p. 65, 

 pi. XV. fig. 3. 



I have in my collection a bilaminate or cylindrical specimen 

 from Port Elizabeth (S. Africa). The small pieces at first grow 

 round a piece of seaweed, and then the growth is free and cylin- 

 drical, but perhaps as the growth increases it becomes bilaminate. 

 The frontal lamina is turned directly downwards, much as in 

 M. permunita, and the membrane in which the operculum occurs 

 is deeply sunk at the end of the lamina. The opening of the 

 avicularium is narrow. The rosette-plates are close to the basal 

 wall, and there seem to be four lateral plates. M. imbricata 

 does not belong to the Ghaperia group, while ''^ AmpJiihlestrum^' 

 cristatum of Busk does. 



Loc. Simon's Bay, Cape of Good Hope {Bush) ; Port Elizabeth. 



