124 Rev. T. Hincks's Contrihutions towards a 



rising into a hood-like expansion (PI. V. fig. 6h) ; mandible 

 long, broad at the base, narrowing off to about the centre and 

 then of equal width to the extremity, which is rounded. 

 Ocecium rounded, suberect, with a large opening in front, 

 broader than high, surface minutely roughened, frequently an 

 umbo on the top (PI. V. iig.5a). Zoarium of a whitish 

 shining material. 



Loc. Singapore or Philippines {Miss Jelly). 



Provisionally, at least, it will be better to keep the genus 

 Monoporella apart from the Microporellidce. If (as seems 

 probable) the special pore of the latter is represented by the 

 oral sinus of the Myriozoidse, Microporella will have closer 

 affinity with such forms as Schizoporella than with the present. 

 As yet the species of 3Ionoporella described are but few, and 

 we have hardly material for a thorough study of the type. 



There is a curious similarity in many points between this 

 species and Schizoporella operta, described in a subsequent part 

 of this paper; and probably they may be not remotely connected 

 genetically. But they are separated, in fact, by well-mare d 

 differences in the structure of the orifice, and for the purposes 

 of classification are pro])erly placed apart. At the same time 

 we cannot be too often reminded that the hard-and-fast lines 

 of our systems have no place in nature. 



In the specimen of M. albicans which I have examined 

 the ooecia, which are numerous, are placed in almost all cases 

 (if not all) awry, so that the opening is turned sideways, 

 instead of looking straight forward as is usual. This is 

 probably a peculiarity of the special colony and not a general 

 character. 



Family Myriozoidae (part.), Smitt. 



SCHIZOPOKELLA, Hincks. 



Schizojyorella incrassata^ n. sp. (PI. V. figs. 1, 1 a.) 



Zooicia ovate, quincuncial, punctured round the border, the 

 marginal cells moderately convex, with a perfectly smQoth 

 surface, the older highly calcified, the walls very thick, 

 vitreous, shining; surface covered with irregular nodulous 

 masses ; orifice suborbicular, Avith a well-marked rather nar- 

 row sinus on the lower lip, peristome in the younger cells 

 thin and not elevated, in the adult zooecia the orifice deeply 

 immersed, the cell-wall much raised and thickened round it, 

 forming a kind of shaft above it ; at one side below the 

 mouth a large rounded swelling, bearing on its upper surface 

 a suberect pointed avicularium^ placed transversely along one 



