150 THE SPONGES OF THE WEST-CENTRAL PACIFIC 



regard to species which have other microscleres. The type of this new genus is 

 hereby designated as the species Iotrochostyla iota. 



The generic name is based upon the resemblance to Iotrochota, and in- 

 cludes reference to the occurrence of styles. 



Iotrochostyla iota, new 



Text Figure No. 97 



This species is here represented by the following : 

 U.S.N.M. No. 22909, My No. M. 214, here designated as type, collected 

 August 13, 1949, by diver from the west part of Truk lagoon, specifically 

 at Lemotol Bay. The depth was 4 meters, and the substrate was dead 

 coral. This species was common locally. 



This species is a thin crust, measuring only 0.6 mm thick but spreading 

 laterally for at least 20 cm. 



The ectosome and endosome color in life was jet black, and the con- 

 sistency was mediocre. 



The surface is smooth and lipostomous. 



The ectosome and endosome are not sharply separated from one another. 



Text Figure No. 97. Spicules of Iotrochostyla iota, X 782. A: Style. B: Amphidisc. 



The spiculation of this thin incrustation consists exclusively of smooth 

 styles, 4 /a by 125 /x in dimensions, and amphidiscs or birotulate micro- 

 scleres, 13 ju, long. The latter do not have long, sharply separated clads, but 

 the discs have many short teeth. The number could not be counted with 

 accuracy. 



One other species needs to be referred to this new genus. This was 

 originally described as Iotrochota magna by Lambe, 1894, page 120, from 

 the vicinity of Alaska. It was pale in color, and its spicules were very 

 much larger than those of iota. 



GENUS DESMACELLA Schmidt 

 Desmacella lampra, new 



Text Figure No. 98 



This species is here represented by the following : 

 U.S.N.M. No. 23088, My No. M. 470, here designated as type, collected 

 August 13, 1949, by diver in the west part of the Truk lagoon, specifically 

 at Lemotol Bay. The depth was 4 meters, and the substrate was dead 



