164 CLASS III.— ORDER I. 



SECTION IV. 



Masses concave, vase, crater, or funnel-shaped. 



ORDINARY. 



57. Spongia usitatissima. Tough, soft, downy, and 

 very porous ; oscules disposed in rayed ranges on 

 the sides of the cavity. 



Var. B. Larger and crater-formed ; the ranges of 

 oscules running into furrows. 



Var. C. Appendages in the form of lobes, both 

 inside and outside. 



American seas. 



N. B. Employed for domestic uses. 



TUBULIFEROUS. 



58. Spongia tuhulifera. Sessile, soft, and very 

 porous, extending at the sides in angular and pro- 

 jecting lobes, which are tubulous and disposed like 

 stars. 



Supposed to originate in the American seas. 



STARRY. 



59. Spongia stelUfera. Large, and formed like a 

 deep crater ; soft, rather thin, and very porous ; the 

 interior osculated ; oscules star-shaped. 



Var. B. Very large, in form resembling an ear. 

 Probably America. 



STRIATED. 



60. Spongia striata. Funnel-shaped, slightly 



