THE MOUNT DESERT REGION 



109 



Geographical distribution. Hudson Bay (Lambe), Mount 

 Desert Region. 



SuBERiTES CONCINNUS Lambe 



?8. compact a Verrill (1873, p. 744) ; ^S'. concinnus Lambe 

 (1895, p. 128, pi. 2, figs. 12, 12a). 



This species was taken at Station D 110 and one specimen at 

 Station D 40, hard bottoms, depth 23 to 69 feet. 



There are six specimens of very hard sponge which have 

 been placed with some doubts in this species. These speci- 

 mens are irregularly circular, subhemispherical, smooth, and 

 very hard, almost stony. The oscula are few and very 

 inconspicuous. 



Skeleton. In the body of the sponge the spicules are scat- 

 tered and without definite arrangement. At the surface they 

 are perpendicular and seem frequently, although not invari- 

 ably, gathered into bundles forming a compact cortex. The 

 styli project but very slightly beyond the surface. 



Spicules. These are tylostyli varying in length from .203 

 mm. to .324 mm., with the mode at .284 mm. They are long 

 and slender with one end tapering gradually to a point. The 

 other end is slightly enlarged, but usually largest a slight 

 distance from the tip, so that this end has a somewhat ovate 

 form. 



Remarks. Verrill and Smith have described a species, 

 Suherites compacta, but have included in their description no 

 figures, measurements of spicules, nor any details of skeletal 

 arrangement. This species is recorded as being remarkable 

 for the compactness of its tissues; as having small and incon- 

 spicuous oscula, and as having a smooth surface. The spic- 

 ules from the specimens from this region are identical with 

 those described for Suherites compacta. From the Pacific 

 coast of North America Lambe has described Suherites con- 

 cinnus. Our specimens fit the description of this latter species 

 in every detail except that the spicules of S. concinnus are 

 described and figured as having evenly rounded basal ends 

 instead of somewhat ovoid ends. It seems very probable that 



