300 BIOLOGICAL SURVEY OF 



wards and may be attached to the peristome of a neighbor- 

 ing zooecium, but not always. The ovicell may terminate in 

 short branches occupying the hollows between the zooecia 

 distal to it, but the great part of the dilated portion is 

 unbranched. ' ' 



Hincks mistook the ooeciostome and evidently 'schematized' 

 his drawing of his figure 5 somewhat. Miss Hastings has sent 

 me a correct drawing of the same ovicell which Hincks drew, 

 which shows the ovicell somewhat irregular in form distally 

 and the ooeciopore at one side, instead of in the middle, as 

 Hincks drew it. He evidently took the small central zooecial 

 orifice for the ooeciopore. Miss Hastings' drawing is repro- 

 duced herewith (pi. 2, fig. 9) in correction of the error. 



OxcorsoEciA CANADENSIS u.sp. PI. 2, figs. 1-4. Zoarium 

 a flabellate or irregularly lobulate incrustation, much thinner 

 than diastoporides. The tubules are thin-walled and are defi- 

 nitely punctured. They are more slender (average width 

 about 0.18 mm.) than those of diastoporides, which they some- 

 what resemble, and never more than one row of incomplete 

 zooecia appear at the margin. The erect portions of the tubes 

 are short and thin-walled, and the apertures measure about 

 0.095 mm. in diameter. The ooecia are like small, thin-walled 

 blisters. The fertile zooecium arises in the same manner as 

 the infertile ones, but soon expands both frontally and lat- 

 erally, and the adjacent tubes appear as if separated by the 

 growth of the ooecium. In one case, the expansion is cordate 

 in outline and does not extend beyond the ooeciopore, but in 

 the other ovicelled specimen a lobe of the expansion extends 

 distally on either side of the ooeciopore for some distance. 

 The ooeciopore opens between, but not close to the apertures 

 of the adjacent tubules. The ooeciopore is rounded or slightly 

 elliptical transversely, only slightly raised above the general 

 level, and measures 0.06 mm. 



Seven specimens are in my possession. Three of these bear 

 the data 'Gulf of St. Lawrence, J. F. Whiteaves, 1873.' Two 

 others, given me by Verrill some 25 years ago, were labeled 

 ' Stomatopora diastoporides, Xorman, Canada.' Another is 



