THE MOUNT DESERT REGION 97 



Microscleres. These are isochelae of one type and vary 

 from .024 mm. to .031 mm. in length. In lateral views these 

 isochelae somewhat resemble the Homoeodictya chelae except 

 that the inwardly projecting tooth is not so strongly 

 developed. 



Eemarks. This form differs from Esperiopsis quatsinoen- 

 sis in the length of the styli and in the degree of development 

 of the projecting tooth of the isochelae. 



Lundbeck described a specimen from Iceland of this species 

 in which the styli measure .38 mm. to .44 mm. in length. This 

 specimen contains the peculiar Homoeodictya chelae, although 

 he reported that this peculiarity was not found in all of them. 

 Vosmaer claims that E. alderi is a synonym of E. normani and 

 Topsent considers E. alderi to be a synonym of E. fucorum. 



Geographical distribution, Iceland (Lundbeck) ; Mount 

 Desert Region. 



Mycale Gray 

 Mycale lingua (Bowerbank) 



Lundbeck (1905, p. 29, pi. 9, fig. 6a-f). 



This species has been taken at Stations D 117 and 130, rock 

 and blue clay, depth 54 to 239 feet. The specimens are mas- 

 sive and lobate and rather soft in consistence. 



Skelton. This consists of branching and anastomosing 

 fibers which extend from the base throughout the sponge. 



Spicules. Megascleres are styli for the most part, although 

 quite a few subtylostyli are present. These specimens con- 

 tain in abundance the constricted spicules described by Bow- 

 erbank for Desmacidon constrictus, which Topsent considers 

 as identical with Mycale lingua. Some of these spicules have 

 more than one constriction. The styli vary in length from 

 .445 mm. to .567 mm., with a mode at .486 mm. Microscleres 

 consist of anisochelae and sigmata. The anisochelae are of 

 two sizes, with so few of an intermedite size as to eliminate 

 the possibility of the smaller ones being only developmental 

 forms of the large ones. The large anisochelae are frequently 

 found in rosettes, which does not seem to be the case for the 



