(590 MR. A. "W. WATERS ON MEMBEANIPORID^. 



The ' Challenger ' Jf. crassimarginata var. erecta is clearly 

 this species, and the distal walls have the characteristic distal 

 3 osette-plates as found in the Ku^ivdiXiSiPa. perfragilis, and have 

 two lateral rosette-plates. The mounted British Museum speci- 

 mens from both Stat. 162 and 151 have the avicularia as figured 

 by Hincks in his description, but in none of the specimens 

 iu my collection do I find any, and it was first described by 

 MacGillivray without avicularia. A poor specimen in the British 

 Museum collected by the ' Challenger ' from Nightingale Island, 

 135 c, would appear to be M. crassimarginata, while those from 

 Stat. 135 a, Inaccessible Island, also named M. crassimarginata 

 vur. iiicrustans, are quite difi"erent (see M. incrustans, p. 686). 



Ortmann describes an incrusting variety from Japan. 



Loc. Bass's Straits (MacG. ^ CJiall.) : Port Phillip Heads 

 (MacG.) ; Heard Island (Indian Ocean) (C72«/Z.); Japan (Ortm.). 

 Fossil : Muddy Creek (Victoria). 



Membeanipoba btjesaeia, MacG., var. pniLLiPEifsis, nov. 

 (PI. 49. fig. 11.) 



This differs from the hursaria of MacGrillivray in having no 

 " mammilliform process." The distal end of the calcareous lamina 

 is arched, formiag a depression at each side covered with a mem- 

 brane, and it reminds us of Micropora. In older cells the lamina 

 near the opercular end is more depressed and is marked off" by a 

 circular rim. The lower part of the lamina is perforated, but 

 not the upper part. Avicularium duckbill-shaped. 



Loc. Port Phillip (Victoria). 



Membeanipoea capeie]S"sis, sp.nov. (PI. 47. fig. 6.) 

 A small fragment from Capri has exceptionally large zooecia, 

 about 0'6-0"7 mm., and the walls are thinner and less calcified 

 tlian in any species with which I am acquainted. There are no 

 avicularia, and only on one zooecium is there an oviceil, which is 

 cap-like. This somewhat resembles the M. irregularis of 

 d'Orbigny, but the walls are less calcified. 



Membeakipoea ELizABETHiEiiTsis, sp. nov. (PI. 47. figs. 18, 19.) 

 Zoarium bilaminate. Border of the zooecia much raised, bearing 

 one or two avicularia below the zooecia and others on the side. 

 The avicularia on the border are short and are closed by an 

 obtuse triangular mandible, and there is no complete bar across 

 tbe avicularium, but a tooth at each side. Frequently theavicu- 



