THE MOUNT DESERT REGION 93 



Geographical distribution. Davis Strait (Lundbeck) ; 

 Mount Desert Region. 



Reniera urceolus (Rathke and Vahl) 



Lundbeck (1902, p. 35, pi. 1, fig. 6; pi. 11, fig. 1). 



There are 2 beautiful specimens of this species, which 

 were taken at Station 21, hard bottom, 50 to 60 feet deep. 

 This species appears to have a definite mode of growth, one 

 specimen consisting of a single erect tube 125 mm. high with 

 a single osculum, 7 to 8 mm. in diameter, at the top of a 

 slightly raised prominent margin or collar. The specimen is 

 broadly attached at the base. The other specimen is 150 mm. 

 high and has a broad base which is considerably narrowed at 

 the point of attachment. From the base arise 3 broad tubes ; 

 the middle one terminates in a single small osculum; each of 

 the lateral tubes bifurcates near the top, and at the tips of 

 each of these branches there is a small osculum. All the 

 oscula in this specimen are quite small (2 to 3 mm. in diam- 

 eter). Both specimens are hollow. 



Skeleton. This consists of a regular mesh, mainly rectangu- 

 lar. The longitudinal fibers are distinct and complete, 

 whereas the transverse ones are indistinct and often not 

 continuous. Most of the fibers are unispicular and the 

 spicules are firmly united at their ends by a definite globule 

 of spongin. In addition to these fibers, there are present some 

 comparatively thick, polyspicular fibers which are stouter 

 and more numerous in the base and stalk of the sponge. 



Spicules. The spicules are thick, slightly curved oxea, vary- 

 ing from .219 mm. to .255 mm. in length. 



Geographic distribution. Iceland (Lundbeck) ; Mount Des- 

 ert Region. This is the first time this species has been re- 

 ported from the coast of continental North America. 



Chalina Grant 

 Chalina oculata (Pallas) 



Bowerbank (1864, p. 208, pi. 13, fig. 262; 1866, p. 361; 1874, 

 p. 169, pi. 66, figs. 1-3). Lambe (1896, p. 184, pi. 1, figs. 2, 2a). 

 Lundbeck (1902, p. 10, pi. 8, fig. 7). 



