Porifera of Friday Harbor- — DE LAUBENFELS 
sponge from Peavine Pass, but Lambe (1894: 
121) described from the vicinity of Alaska a 
sponge which he named Myxilla behringensis. 
The dermal spicules and microscleres are very 
like those of his lacunosa , and significantly the 
endosomal spicules vary from entirely smooth 
as in his lacunosa to spiny as in the specimen 
he identified as rosacea. This behringensis did 
have the peculiar arrangement of the pores and 
oscules of the specimens herein described. It 
seems probable that only one species is involved 
in all of these descriptions, and it is therefore 
proposed that Myxilla behringensis Lambe be 
dropped in synonymy to his lacunosa , which 
was transferred to the genus Burtonanchora by 
de Laubenfels (1936^: 94). 
Ectyodoryx parasitica (Lambe, 1893) de Lau- 
benfels, 1936* 
This species is exceedingly abundant in the 
vicinity of Friday Harbor, occurring apparently 
always on the shells of bivalve mollusks belong- 
ing to the genus Pecten. In fact, practically every 
specimen of Pecten collected in this vicinity 
seems to have been utilized by the sponges. Usu- 
ally the sponges are of this species, but occa- 
sionally My cole adhaerens , to be described below, 
is also found on the shells. Two hundred and 
two such sponge-covered pectens were taken for 
study, and of them 183, or well over 90 per 
cent, proved to have Ectyodoryx . Nineteen had 
the Mycale. It was further noticed that in each 
case when both the valves of the pelecypod were 
abundantly covered with sponge, that the mol- 
lusk was always a male, though not all males 
were so distinguished. 
The crust has a relatively smooth surface, al- 
though showing many openings such as pores 
and oscules. Thickness may attain to 12 or 15 
mm., and lateral extent is of course limited by 
the size of the shell. The color in life is a dull 
grayish drab and the consistency is weakly 
spongy or fragile. The surface is abundantly 
covered with rather coarse pores and oscules 
about 1 mm. in diameter, irregularly scattered. 
The endosome is "crumb-of -bread” in appear- 
ance and consistency. The special dermal spic- 
ules are hastately pointed tornotes, verging 
slightly upon the tylote shape. They are from 4 
X 130 /x to 6 X 145/a. The endosomal or princi- 
197 
pal spicules are styles, usually acanthose, about 
11/x in diameter, but ranging in length from 
190 to 270/x. Occasionally the spines are almost 
or completely wanting, which is very interesting 
in comparison to the preceding species, as is 
also the fact that there are two categories of 
isochelas present. These are anchorate, the larger 
being 54/a in length, while the smaller are only 
14/a in length. There are also two sizes or cat- 
egories of sigmas, each respectively about the 
size of the corresponding isochelas. 
This species was originally described by 
Lambe (1893- 31) from Vancouver Island, as 
Myxilla parasitica . It was reviewed by de Lau- 
benfels ( 1936a: 84) and its correct location in 
the genus Ectyodoryx was shown by him. 
Tedania fragilis Lambe, 1894 
The specimen thus identified was dredged 
northeast of Blakeley at a depth of between 
50 and 66 m., on July 6, 1931. It is an encrusta- 
tion less than 1 cm. thick, and about 2 X 4 
cm. in area. In life it was flesh colored, and the 
consistency is very soft, fragile and compres- 
sible. The surface is comparatively smooth, al- 
most glabrous. Pores and oscules can not be 
made out. 
The endosome is rather dense to the unaided 
eye and microscopically is seen to be packed 
with plumose tracts, which is an axinellid char- 
acteristic usually not so pronounced in the genus 
Tedania . The special dermal tornotes are hast- 
ately pointed, 4 X 200/a. As may be expected 
the principal skeleton consists of styles, 3 X 
150/a to 7 X 400/a, but it is most astonishing 
to note that some of these are more or less cov- 
ered with small spines. The microscleres are 
onychaetes as is absolutely typical for the genus 
Tedania] these are long thin rhaphides 1 X 
150/a to 3 X 200/a which are covered by char- 
acteristic roughenings, rather than pronounced 
spines. 
A specimen which must surely have been 
conspecific with the one under discussion was 
described as Tedania fragilis by Lambe (1894: 
116). It was a more typical Tedania , not pos- 
sessing the unusual shape of the styles. Identi- 
fication of the Puget Sound sponge with Tedania 
is rather confidently made, however, because of 
the very characteristic microscleres. 
