THE MOUNT DESERT REGION 



325 



accepted Packard's name for the species and redescribed it 

 in more detail under the genus ^Smittia.' Whiteaves records 

 it from the Gulf of St. Lawrence ' at many localities. ' Nord- 

 gaard found it in material from the second 'Fram' expedition, 

 dredg-ed in Jones Sound and Winter Haven, on the west side 

 of Baffin Bay, and placed it in the genus Scliizoporella. Kluge 

 later recorded it from the west side of Greenland. The pres- 

 ent record from Mt. Desert Island appears to be the most 

 southerly. 



As indicated above, the species has been shifted about con- 

 siderably. After the examination of my material, including 

 two specimens from the Gulf of St. Lawrence (one of them 

 from Verrill's collection and identified by Dawson), I am 

 again changing the generic status. The more recently de- 

 scribed genus Stomachetosella of Canu and Bassler, 1917, 

 appears to fit it better than any other, and it has certain 

 relationships with Lepralia sinuosa Busk, which has already 

 been transferred to this genus. The form of the primary 

 aperture, in the absence of lyrula or sinus, is neither that of 

 Smittina nor Schizoporella, while the heavy secondary calci- 

 fication, which appears almost at once and which covers the 

 whole of the zooecia and ooecia, forms a secondary aperture 

 with a deeply notched secondary sinus or spiramen. 



The zoarium forms a thick, rough, reddish-brown crust on 

 pebbles and shells. The zooecia are large, perforated around 

 the border with about a dozen large pores, and a few similar 

 pores appear irregularly disposed on the front. The primary 

 aperture is rounded, somewhat more straight on the proximal 

 border, with no indication of a sinus ; the hinge denticles are 

 small and rounded; the ooecium is globose and imperforate. 

 Soon, almost at once, the primary characters are covered by 

 a very thick tremocyst, through which the frontal pores are 

 continued without much change in size, and this layer is con- 

 tinued evenly over the whole surface, forming a deep peris- 

 tome, which is deeply and irregularly notched at the proximal 

 border. The ooecia also are covered and become completely 

 imbedded. There are no avicularia or spines. 



