a General Mistory of the Marine Polyzoa. 11 
This group is formed for species with a Microporellidan 
orifice, but destitute of the median pore, which is so striking 
a character of the genus Microporella. It is difficult to 
believe that this structure has no special significance ; it is at 
least a much better clue to affinity than mode of growth. 
If this be so, the Microporellidan forms from which it is 
absent may well be set apart as a distinct group*. 
Haploporella nodulifera, nu. sp. 
(Pl. I. fig. 4.) 
Zoecia massive and thick-walled, ovate, irregularly dis- 
posed, of a brownish colour; a depressed area extending 
downwards from a little below the orifice, and occupying a 
large proportion of the front, the cell-wall elevated around it, 
surface minutely roughened and punctured; orifice arched 
above, inferior margin straight; peristome slightly raised, 
three spines on the upper edge, with a black base; at each 
side of the orifice, on a level with the lower margin, a promi- 
nent nodule, often of a rich brown colour and polished. 
Oacium (?). 
A single colony only has occurred on shell. 
Haploporella lepida, n. sp. 
(BI sire 3323) 
Zoecia hexagonal, very regular in shape, quincuncial, sepa- 
rated by somewhat shallow sutures and raised lines, slightly 
convex ; surface minutely granular, shining, of a delicate 
greyish colour; orifice arched above, much broader than high, 
lower margin straight, rather raised and everted ; peristome 
thin; a rather large circular perforation on each side a little 
below the orifice, and commonly a few others, usually smaller, 
round the edge of the cell. Occasionally an avicularium, 
placed on a distinct area, at the bottom of a cell, with an 
elongate mandible directed upwards. Occiuwm globose, pro- 
minent, granular. 
Loc. Off Curtis Island, on shells. 
A very pretty species, singularly regular and neat in ap- 
pearance. 
* Smitt’s genus LEscharipora (as far as I understand it) is founded 
for Microporellidan forms with more than a single pore. But the physio- 
logical significance is the same, whether there be one or many, and the 
pees seems to be unimportant ; so also are differences in the shape of 
the pore. 
