58 



have found it as large as one's hand and an inch and a half thick. 

 It is generally green, but not always. Skeleton spiculae fusiformi- 

 acerate; slightly curved, moderately stout, spined. Spines small, 

 sparsely distributed; length o.oi to 0.012 in.; apices naked. These 

 are mixed with many fine, delicate spiculae, densely spined to the 

 end; length 0.009 in.; scattered in groups on slide of mounted speci- 

 mens. I cannot say what is their true place in the sponge. Ovarian 

 capsule or statoblast globose; dia. 0.02 in.; foramen tubed, tube 

 terminating with from three to ten tendril- or tentacle-like pro- 

 cesses; spiculae birotulate, long, very delicate; length of axle 0.015 in., 

 one or more spines on axle; rotulae slightly arcuate, equal in size. 

 Length of tube to foramen 0.0 1 in., varying a little; the length of the 

 tentacle-shaped processes is from .02 to .0125 in. The walls 

 of the statoblasts of this species are very thick, and consist of three 

 coats. The outer or encrusting wall is made up of the birotulates, 

 which are imbedded in a greyish substance the character of which 

 is unknown. The birotulates are placed radially, and give great 

 strength to the body. The second coat is much thinner and is 

 called the chitinous coat, from the character of the substance 

 of which it is composed. The inner or investing membrane is very 

 thin and delicate. Its office is to hold the germinal matter of the 

 statoblast, which it does, fitting up close into the tubular opening in 

 a nipple-like form, ready to allow the contents of the statosphere 

 to flow into the tube upon its rupture at the proper season. 



No. 3 is difficult to describe from specimens found in our 

 locality. The action of the water upon the rocks where it is found 

 is so great as to take away all the upper part of the sponge. We 

 have identified it, however, with a species found in Philadelphia 

 and named by Dr. Leidy S. fragilis. The ovarian capsules or 

 statoblasts lie close together in a mass, attached to rocks or any 

 object in its way. Above these, and enclosing them, is the sponge 

 proper, made up of spiculae sarcode and other elements that con- 

 stitute the spongillae. The statoblasts are nearly globose, some- 

 times rather flattened; foramenal tube short, sometimes erect and 

 sometimes bent over; outer wall of statoblast thin and leathery, 

 with cellular structure, overlaid with small, not pointed, densely- 

 spined spiculae; skeleton spiculae fusiformi-acerate, not spined. 

 Only small specimens of this species have been found. 



