•58 (B^iUetin of the JtJatural History Society. 
which varies from bright to dull brick-color. If placed in a glass vessel 
full of water, it will expand its tentacles and present a most beautiful 
sight. It lives among rocks at low and in shallow water, clinging to 
the under sides of ledges or in crevices between stones, In their de- 
velopment they pass through a free-swimming stage in which the bright 
red pear-shaped larva, having a circle of five tentacles at one end of the 
body and two at the other, moves by means of many cilia on different 
parts of the body. [See Plate, Fig. 166.] 
24. Tliyoiiidium prodiictiim, (Aykes), Stimpsoi^. Duas- 
7nodactyla iwoducta^ (C). 
Description. (C) p. 244. 
Figure. 
Distribution, (a) General; — Bay of Fundy. 
(1) In N. B. ivaters ; — Eastport, rare, Ayres, (C); under 
stones at low water, not common, Verrill, (L); rare, (N). 
Orand Manan. This species is found in deep water, but 
occurs most frequently under stones, or buried to a slight 
depth in gravel near low-water mark,” Stimpson, (D). 
This rather uncommon species may be readily distinguished when 
found, by the scattered tube-feet, the latter being distributed without 
order over the greater part of the surface of the body. It is from three 
to five inches in length and lives under rocks or buried to a slight depth 
in gravel about low- water mark. Ayres’ (C), description of it in part is 
as follows: “ The are numerous, without order. The neck, for 
about half an inch behind the base of the tentacles, is nearly naked. A 
few suckers, however, are found on it, larger than those on the other 
parts of the body. The integuments here, also, unlike those of the other 
parts of the body, contain an abundant calcareous deposit. The tenta- 
cula are of very unequal development; two large, ramose, then two very 
small (scarcely exceeding one-tenth of an inch), two again large, etc. , 
thus making ten pairs. In color this species is of a pale yellow, the 
neck and tentacles being purplish.’’ Nothing is known of its habits or 
development. 
25. Peiitacta frondosa, (Gunnerus), Jaeger. Gacumaria 
frondosa (GuNN.), FoRBES, (U). Cucumaria fucicola, 
Forbes and Goodsir, (A). [See Plate, Fig. 17.] 
Sea-Cucumber,” ‘^Sea-Pumpkin.” 
Description. (A) p. 209. (K) p. 99. (U) p. 2. (M) 
p. 347. 
