NOVA SCOTIAN ECHINODERMATA.—HONEYMAN. Qt 
plates—the “ocular plates.” Each of these is perforated, to 
accommodate the “ocellus” or eye. The mechanism and design 
of the whole is admirable—perfect. 
The next family is Clypeastride. 
Of this we have one representative—Hchinarachnius parma 
—(sand dollars.) Our specimens of these were collected from 
the sand flats of Cow Bay and Clam Bay. Their form is dis- 
coidal. The accommodation for the creature seems scanty. They 
are covered with minute spines. Their mouth is under, central, 
on the flat side. The anus is central, on the upper convex side. 
Like the Echinus they have five teeth. Unlike they do not pro- 
ject. You have to look into the mouth to see them. In the 
Kchinus the ambulacral apertures extend from pole to pole. In 
our Clypeaster they are only on the convex side, where they are 
arranged in stellar form—five rays—having the anus for a cen- 
tre. They burrow in the sand. Only tests can be seen on the 
surface. When the sea is ebbing, circular depressions in the wet 
sand, mark their existence. Our specimens vary in size from }$ 
inch to 24 inches. 
The fifth order is Holothuroidea. 
These are known as “Sea Cucumbers,” Trepangs and “ Beches- 
de-mer.” They are the most highly organized of the Echino- 
derms. These are well represented in our Harbor and Bedford 
Basin Collections. We have notable examples of the Family 
Dendrocherote. 
1. Psolus phantapus. 
Our specimen is an unusually large one. It measures from the 
oral to the anal opening along the middle of the disc 8 inches ; 
its girth is 6 inches. The length of the disc is 34 inches. There 
are two rows of feet along either side and another along the 
middle; along the back from the oval to the anal opening it 
measures 42 inches. The tail and neck and mouth rise above the 
back, giving it a saddle shape. Its color is brownish. A China- 
man who loves a trepang as much as a bird’s nest would gloat 
over it. We have had many specimens of the common size— 
none approaching to this one. 
