1869.] and Membranipora Bengalensis. 55 



Phylum, Mollusc a. 



Sub-phylum, Himatega.* 

 These animals are also called Moluscoidea, — they are without a 

 complete nervous system, the heart is wanting and if present it is 

 without an auricle. 



Class, Bryozoa or Ciliipoda (Polyzoa, auctorum). 

 Heart and special organs of sensation wanting. 



Sub-claSS, GYMNOL^lMA.f 



With a simple row of tentacles. 



Order, Chilostomata.J — (Cellulinea d'Orb.) 

 Cells more or less ovate, aperture not produced, closed by an 

 operculum or a muscular lappet. 



Sub-order, Incrustata. 

 Cells more or less attached by the entire, or a portion of their base. 



Tribe, Membranacea. 

 Cells above wholly or partially membranaceous, the aperture being 

 situated in that membrane. 



Family, FLUSTRELLARIIDiE. 



Cells without special pores. 



Genus. Membranipora, JBlainville. 



Cells large, depressed, their single layers generally incrusting 

 different objects ; upper portion mostly membraneous ; aperture with 

 simple, entire margins, situated at the anterior end. 



Species. Membranipora Bengalensis, Stoliczlca, 1868. 



PI. XII. 



Memb. polyzoario semi-calcareo, simplici, incrustante seu varie 

 torto ; cellulis depressis, sexangularibus, longioribus quam latis, in 

 seriebus alternantibus positis, supra membranaceis, minutissime porosis, 

 infra ac lateraliter calcareis, in adultis ad marginem superiorem non- 

 nullis spinis solidulis paulum elevatis instructis ; apertura in adultis 

 speciminibus sub-rotundata, antice ad terminationem sita, maryinibus 

 integris ah quantum prominentibus circumdata ; margine posteriori paulo 

 producto atque scepius quatuor spinis postice prolonyatibus instructo : 



* Hasckel, Oenerelle Morphologie, Berlin, 1866, Vol. II. p. cv. 

 t The other sub-class form the Phylactol^ema. 



X The other orders are Cyclostomata, Ctenostomata, Paludicellea and Urna- 

 tellea. 



