THE MOUNT DESERT REGION 327 



ture is large, broad, and in some cases roughly granular. The 

 pointed avicularia (often wanting) are present in the usual 

 position, on one or both sides of the aperture at the level of 

 the sinus. The ovicell is roughly granular, 



ScHizoMAVELLA Canii and Bassler, 1917 

 ScHizoMAVELLA AUEicuLATA (Hassall), 1842. PL 9, tig. 5. 

 (Osburn, 1912, p. 237 {Schizoporella), for synonymy and ref- 

 erences ; 1912 a, p. 280, Cape Sable, Nova Scotia, and St. 

 Pierre Bank, Newfoundland; Whiteaves, 1901, p. 100, as 

 ScJiisoporella aiiriculata, and p. 106 as Smittia glohifera 

 (Packard), Canadian records.) Common on stones and stems 

 of other organisms, taken at seven shore stations and ten 

 dredging stations. It is cosmopolitan in distribution, ranging 

 from high Arctic to tropical seas. The somewhat flattened 

 frontal area of the ovicell, which is provided with pores, 

 together with the shallow sinus and median rounded avicu- 

 larium just proximal to the aperture, will separate the species 

 from other American forms. 



Stephanosella Canii and Bassler, 1917 

 Stephanosella biaperta (]\[ichelin), 1841-1842. PI. 15, 

 tigs. 5-6. (Osburn, 1912, p. 237 (Schisoporella), for synomniy 

 and references; Whiteaves, 1901, p. 100 (Schizoporella), for 

 Canadian records.) Rare, only one specimen observed, 

 dredged at station 60. The species has a very wide range, 

 Spitzbergen and Greenland to the tropics, and in the Pacific 

 as well as the Atlantic. It may be distinguished by the imper- 

 forate ovicell, which has a flattened frontal surface with a 

 raised border, by the small V-shaped sinus, and by the pres- 

 ence of a small oval avicularium on one or both sides of the 

 aperture at the level of the sinus. 



Hippoporinae Canu and Bassler, 1917 

 HiPPODiPLOSiA Canu, 1916 

 This genus was erected by Canu to include certain escharel- 

 lidan species with a broad 'poster,' the region of the aperture 



