94 BIOLOGICAL SURVEY OF 



This species was taken at Stations D 19, 67, 86, 149. Young 

 individuals were taken at Station 19. It occurs on hard bot- 

 toms, depth 50 to 330 feet. 



This species has a characteristic form and mode of growth. 

 In older individuals it is stalked and branching, whereas 

 young specimens are unbranched. Oscula are small but con- 

 spicuous and usually arranged in rows on one side of the 

 branch. 



Skeleton. This is chiefly unispicular, but polyspicular fibers 

 are found in the older portions of the specimen and toward 

 the middle of the branches, but they contain only a few spic- 

 ules. The amount of spongin varies in different individuals, 

 as well as in different parts of the same individual, usually 

 being more abundant in the older portions and the stalk. In 

 mature individuals the spicules may be surrounded by a thin 

 sheath of spongin. Globules of spongin firmly unite the ends 

 of the spicules. 



Spicules. These are slightly curved, evenly and gradually 

 tapering oxea which vary from .121 mm. to .146 mm. in 

 length. The variation in size is very slight A\dthin the 

 individual. 



Geographical distribution. This species is very common in 

 Vineyard Sound, Massachusetts Bay, Casco Bay ( Verrill, 

 Kingsley) ; Bay of Fundy, and Gulf of St. Lawrence (Lambe) ; 

 Mount Desert Region. 



Family Desmacidonidae 



EsPERiopsis Carter 

 EsPERiopsis QUATsiNOENSis Lambe 



Lambe (1893, p. 67, pi. 3, figs. 8, 9; pi. 5, figs. 8a-c). 



This species has been taken at stations 136 and 149, rock 

 bottoms, depth 22 to 100 feet. Only one well-preserved speci- 

 men was taken at D 149. It is stalked and spatulate and is 

 60 mm. high and 30 mm. broad at its greatest breadth. The 

 oscula are from 1 to 2 mm. in diameter and confined almost 

 entirely to the sides. In some cases their margins are slightly 

 elevated. 



