THE MOUNT DESERT REGION 101 



HoMOEODiCTYA Ehlers 



HOMOEODICTYA PALMATA (JohnstOn) 



Lundbeck (1905, p. 121, pi. 13, fig. 6a^). 



One small fragment of this species was found at Station 

 94, on rock in 71 feet of water, but due to the peculiar type of 

 isochelae in this species there is no doubt of its identification. 



Skelton. The skeleton is composed of a rather regular 

 reticulation of polyspicular fibers bending toward the surface. 

 Transverse, though discontinuous, fibers make with the pri- 

 mary fibers a rectangular meshwork. 



Spicules. Megascleres are straight or slightly curved oxea 

 whose length varies from .182 mm. to .219 mm., with the 

 mode at .204 mm. 



Microscleres are all isochelae of a peculiar type. These 

 isochelae are carefully described and well illustrated by Lund- 

 beck in the reference cited above. They vary only slightly 

 in size and measure .03 mm. in length. 



Remarks. This species is easily distinguished from Esperi- 

 opsis quatsinoensis and Esperiopsis {alderif), which also 

 have peculiar Homoeodictya — isochelae, by the presence of 

 oxea, in Homoeodictya in contrast to styli, which are found 

 in Esperiopsis. 



Geographical distribution. Nova Scotia, Sable Island, Bay 

 of Fundy (Lambe), Massachusetts Bay, Gulf of Maine (Ver- 

 rill), Mount Desert Eegion. 



Tedania Gray 

 Tedania suctoria 0. Schmidt 



Lundbeck (1910, p. 1, pi. 1, figs. 1-5; pi. 4, fig. 1). 



This species was taken at Stations D 37, 71, 112, 117. The 

 specimens from 37 and 71 were quite large. Found on hard 

 bottoms, depth 52 to 100 feet. 



This species seems to have a fairly definite mode of growth 

 and a characteristic appearance. Typically, it is massive and 

 attached to a substratum. All the specimens are character- 

 ized by numerous wartlike papillae, although in young indi- 

 viduals the papillae are few and indistinct. The papillae have 

 no openings at their summits. 



