390 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
44, 46 , 48, 50, 52; and on the left side on somites 2, 4, 5 .... 23, 
26, 28, 29, 31, 33, 35, 37, 39 , 41 , 43 , 44, 45 , 47 , 48, 50. The asym¬ 
metrical somites are printed in heavier type. 
4. Polynoe pulchra Johnson. 
Polynoe pulchra Johnson. Proc. Cal. acad. sciences, 3d ser., 
Zoology, vol. 1, 1897, p. 177. Figs. 34, 43, 43a, 50, 50a, 50b. 
The species of scaly annelid referred to by Harrington and Griffin 
(’97) as occurring on Ilolothuria californica is without much 
doubt P. pulchra , as I have found it a frequent commensal or parasite 
of that Ilolothurian. It is well represented in the Columbia collec¬ 
tion. None of the specimens exhibits dark brown or black mark¬ 
ings on the elytra, but all appear to have had the protective reddish 
or flesh tints characteristic of the individuals found on Holothuria 
californica, 
5. Polynoe fragilis (Baird). PI. 1, fig. 1. 
Lepidonotus frag ills Baird. Proc. zool. soc. London, Apr., 1863. 
Halosydna fragilis Baird. Journ. Linn. soc. London, vol. 8 
(Zoology), 1865, p. 190. 
Polynoe fragilis Johnson. Proc. Cal. acad. sciences, 3d ser., 
Zoology, vol. 1, 1897, p. 179. Figs. 36,45, 52, 52a, 52b. 
Numerous specimens from all three districts of the Puget Sound 
region. As stated in the “Preliminary Account” (Johnson, ’97, 
p. 180) this species is much more plentiful in the Puget Sound 
region than on the California coast, where I have collected it only 
in San Francisco Bay, and only three or four specimens in as many 
years. Its great abundance at Port Orchard is noted by Miss 
Robertson as follows : “ Twenty specimens were taken from twenty- 
seven or twenty-eight Star-fishes. Several times two and in one 
instance three, were found on a single Star-fish.” 
The frequent absence of ventral cirri is a striking peculiarity. 
Even when present, the ventral cirrus is very diminutive ; but, on 
the other hand, its absence on all the parapodia seems to be a rare 
occurrence. Of the twenty-nine examples at my command, only 
one (and an imperfect specimen at that) is entirely destitute of ven¬ 
tral cirri. In not a single individual, however, is every parapodium 
provided with a ventral cirrus. 
6. Harmothoe imbricata (L.) Malmgren. 
This ubiquitous species was collected by the Columbia Expedi¬ 
tion, also by Miss Robertson at Alki Point and at other places. 
Most of the specimens are of the usual greenish gray tint with 
