THE MORPHOLOGY OF THE CHEILOSTOMATA. 325 



above) in having the orifice coutaiiied iu a calcareous region 

 which is surrounded by eight short spines. The third is parti- 

 cuhirly interesting in liaving a Schizoporella-like orifice. 



Schizoporella cristata, according to the description 

 given by Hincks, is another form with an intermediate type 

 of ancestrula. The Schizoporelliform orifice is contained in a 

 calcareous oval area, on the proximal side of which are three 

 spines, while the orifice is provided with six oral spines. 



The ordinary zooecia of the form described by Jullien as 

 Temachia opuleuta are lageniform, and without spines, 

 somewhat resembling those of Mucronolla abyssicola. 

 The ancestrula is obviously Cribriliniform. I have myself 

 observed an analogous case. A Cribrilina (sp. ?) from 

 Funafuti, in the collection of the British Museum, has an 

 irregular arrangement of pores on its frontal surface, some- 

 thing like that found in C. monoceros. The primary 

 zooecium is Membraniporella-like, with a perfectly 

 regular double series of transverse bars, separated by 

 simple slits. 



Fig. 2 shows the ancestrula of a colony of Microporella 

 malusii, from Naples. The fi'ontal surface and the oper- 

 culum are Flustrine. The marginal spines, some of which 

 have been lost, were ten in number (as in one of Neviani's 

 cases). They originate, like the frontal spines of Cribrilina, 

 from foramina in the calcareous wall, a little outside the 

 frontal membrane. The spines resemble the three oral 

 spines with which most of tho other zorecia of the same 

 colony are provided. 



An ancestrula of M. ciliata, also fromNaples, is somewhat 

 similar; but it differs iu having a distinct "area," or calcifi- 

 cation of the proximal part of the frontal surface. The living 

 tissues have disappeared, and I am, unfortunately, unable to 

 state certainly whether the calcified area is a cryptocyst or 

 not. This is, however, indicated by the way in which it 

 slopes down steeply from its periphery, so that its inner edge 

 lies at a deeper level than its outer margin. There are ten 

 long marginal spines. 



