0)1 the Determination of Br yozoa. By A. W. Waters. 779 



be taken as typical Membraniporidan opercula. The opercula of 

 Selenaria are also of this form, and those of Cellaria approach to 

 this type, having a downward projection (figs. 12, 13, 20). The 

 opercula of a Lepralia from New Zealand, which I at present 

 think may be called a variety of L. adpressa, has a lateral 

 strengthening bar, and the same is the case in a Microporella 

 aUied to M. decorata Ess. 



The operculum of MonoporelJa crassatina Waters, from New 

 Zealand, has a somewhat similar projection, looking like that of 

 Flustra armata (fig. 7). 



Although the small oral avicularia of Schizoporella auriculata 

 (fig. 36) is very diflerent in size and shape from the larger spatulate 

 avicularia (fig. 35), yet the structure of the mandibles is almost 

 identical. 



The chitinous organ (fig. 8) of Scliizoporella linearis I call an 

 avicularian mandible. It closes a cell which Mr. Hincks (Brit. 

 Mar. Poly., p. 251) calls an ooecial cell, and if I\Ir. Hincks really 

 finds them containing ova, then there can be no doubt about their 

 function. My specimens are all dried ones, and do not enable me 

 to settle this point ; but I have never found such a chamber con- 

 nected with a true ovicell, although there is usually an inflation 

 above it which might easily be mistaken for one. This is shown 

 in my plate IX. fig. 2, " Bryozoa of Naples." * 



* Some of the species alluded to were not mentioned in my paper on the 

 Naples Bryozoa, but since that was written I have collected material from a 

 somewhat wider range, and have also found some fresh specits among the 

 material collected in Naples, and as soon as I have finished work on hand hope 

 to be able to write a supplementary paper about doubling the number previously 

 given. The following is, however, a provisional list of some additions to be made 

 to the Bay of Naples fauna : — 



Bicellaria ciliata L. ; Notnmia {G emelhria) avicularis Pieper ; Cellaria Johnsoni 

 Busk ; Mcm/)ranipora jlustroides Hincks, Capri ; M. Dunierilii Aud. ; M. Lucroixii 

 Aud. ; 31em'jrani]rjorella nitid t Johnst., Capri ; Mastigophora Dutertrei Aud., Capri ; 

 Micropore coriacea Esper., Capri; M. hippocrepis Goldf., Capri; Cribrilina fibular is 

 John.'it., Capri ; Microp'jrella distoma Busk., Capri ; Adconclla polystomella Kss. 

 (^Pallasii Hell) ; I'orina boreatis Busk, Capri ; Palmicellaria elegans Alder. ; Lepralia 

 temata Rss., Capri ; Smittia mai-imrea Hincks, Capri ; S. affinis var., Capri ; S. 

 L/iruyfjruvii Juhnst. ; .S'. cheilostonvi Manz. ; Mucronella Peachii Johnst. ; M. Peachii 

 var. octod<;ntata; lietepora Solanderi Risso ; Dinchoris hirtissima HiiW; Cupularia 

 itellata Busk, Capri ; Setosclla vulnerata Busk, Capri ; Diastopora patina Lamk., 

 Capri ; Akjpmidium mytili Dalyell ; Culindraceum girjanteum Hiacks ; Amathia 

 letuligera L. ; Serialaria semiconvoluta ; VaUieria tuberosa Hell ; Mlmosella gracilis L. ; 

 PedicelUna gracilis Sars. 



