330 BIOLOGICAL SURVEY OF 



setts. It has been recorded at various places in more north- 

 ern waters, though, as it has been confused with the following 

 species, the records are somewhat uncertain. 



The zooecia are rather broad and but little inflated, the 

 whole frontal surface is perforated with very large tremo- 

 pores which increase in size outward to such an extent that 

 the frontal wall of old zooecia looks like a network. The 

 tremocyst, however, does not involve the oral border, but 

 leaves a roughly V-shaped area proximally to the aperture 

 and also leaves the thin-walled low peristome free. Oval 

 avicularia, turned in various directions, sidewise or back- 

 ward, are occasionally present on the area behind the aper- 

 ture. The ooecia are globular and distinctly perforated by 

 numerous pores. The aperture is regularly rounded distally, 

 back to the broad strong cardelles, behind which is the arc 

 of a smaller circle, giving the appearance of a very broad 

 sinus. The operculum has a nearly complete chitinous ring 

 well within the border, joining with the tips of the cardelles 

 and fading out as they approach the proximal edge. 



HippoDiPLOsiA SMiTTi (Kirchcnpauer ) , 1874. PI. 9, fig. 6. 

 (Hincks, 1892, p. 154, pi. 8, fig. 2 {Schizoporella cincta, var.), 

 Gulf of St. Lawrence.) Rather rare, on stones and shells, 

 taken at shore stations 12, 43, 46, 47, and dredging stations 

 13, 27, 36, 147. It has hitherto been known only from more 

 northern waters, but I have a specimen from off Cape Ann, 

 Massachusetts, 30 fathoms, encrusting hard clay, H. S. Col- 

 lins, collector. My specimen from the Foulke Fjord, western 

 Greenland, agrees closely with the Mt. Desert material. It is 

 probably circumpolar in distribution, and has not been found 

 on the European coast south of northern Norway. 



Waters (1900, p. 65, pi. 9, figs. 10-12) described the species 

 under the name of Schizoporella harmsivorfhi, including the 

 S. cincta, var. Hincks and Eschar a legenfili form prototypa 

 Smitt as synonyms, and recognized that Leprali smitti Kirch- 

 enpauer is the same species, but he objected to the use of 

 Kirchenpauer's name. Later Nordgaard (1905, p. 166) made 

 harmsworthi a synonym of reticulato-piinctata Hincks, but 



