OVICELLS OiT CYCLOSTOHATOUS BRYOZOA. 277 
plete, so that frequently this important character cannot be made 
out ; and in my specimen I could not find any opening, but one 
of the lateral zooecial tubes is much larger than usual, and looked 
as though this change was connected with the functions of the 
ovicell. I therefore wrote to Mr. Kirkpatrick, of the British 
Museum, explaining what I had seen in my specimens, and asked 
him if he would look at those in the Museum. He kindly did so 
at once, and wrote that he examined ten ovicells, “and found 
in each instance that the last one or two zooecia of a series in 
proximity to an ovicell are not only enlarged, but considerably 
altered in direction. In eight instances the tube curved for- 
wards and upwards so as to open on the anterior surface.” In 
two the tubes opened laterally. “ In every case the wide tube 
is to some extent connate to a zooecial series ; but in some cases 
the former curves away from the latter in such a way as to make 
the wide tube appear to be part of the ovicell, and not a meta- 
morphosed zooecium ” *. 
I have already referred (Ann. Mag. Nat. Hist. ser. 5, vol. xx. 
p. 255) to the fact that the ovicells of the Cyclostomata have 
the surface nearly always perforated with much more numerous 
pores than the rest of the zoarium. In the present case the 
ridges are narrower and the pits somewhat finer than on the rest of 
the dorsal surface ; and at the base of these pits, which are some- 
times spoken of as pores, there are several fine pores, whereas in 
the pits on the dorsal surface, except when elongated, there is 
but one pore at the base. It will thus be seen that in this case 
the pores on the ovicell are much more numerous than on the 
rest of the zoarium. 
Figures (1 and 3) are given from calcined specimens of the 
front and back of the zoarium, and I consider that preparations 
should be thus made wherever there is available material ; for 
figuring with all the organic integument is like taking a photo- 
graph of a lady with a thick veil down. Calcined specimens can 
be directly compared with fossils. 
The anterior surface has large pores, or rather pits, following the 
lines of the zooecia, with one or two pores at the base of the pit. 
The way in which the ornamented appearance is formed is shown 
more clearly in this species than in any other I have seen. At 
* In the ‘ Challenger ’ specimens in Edinburgh ovicells occur in a large 
number of cases, with a large lateral tube curving forwards. 
22 * 
