222, FAUNISTIC NOTES AT PLYMOUTH DURING 1893-4. 
The form “allied to S. arenosa,” referred to in my previous Notes, 
is this species, as Canon Norman, who kindly examined some speci- 
mens, has assured me. 
Nika edulis has been trawled in the Sound occasionally, but is rare. 
Pirimela denticulata is not uncommon in the patches of clean 
coarse shelly gravel to the south of Drake’s Island. Its highly 
speckled appearance renders it very inconspicuous on this ground, 
into which, however, it promptly burrows so as to be completely 
hidden from view. 
Stenorhynchus egyptius (M. Edw.) is not uncommon on weedy 
ground, and is at once distinguishable from the other spider-crabs by 
its stripes of reddish-brown pigment. The habit of decking the body 
and limbs with bits of seaweed is as marked in this species as in 
any of the others, and as it generally lives among reddish weeds 
its own coloration contributes greatly to its disguise. 
EcurnopermMa.— During August, 1893, the tow-nets frequently con- 
tained one or two specimens of the interesting type of Bipinnaria 
larva described by me in the Quart. Journ. Micr. Sci., January, 
1894. 
Tunicata.—During August and September, 1898, a considerable 
number of specimens of a small Doliolum were found in the tow- 
nettings. They agree with Herdman’s Doliolum tritonis in all 
respects except that the stigmata begin dorsally close behind the 
second muscle band,—a point of no great importance. When alive 
these little creatures are perfectly transparent, and dart about with 
great activity in the water. 
Earlier in the year—from the middle of June to the end of the 
first week in July—the Sound was visited by large shoals of the Salp 
Thalia democratica-mucronata. Many of the specimens first taken 
were of the sterile or nurse generation, and were provided with young 
chains ; the later specimens, on the other hand, were chiefly sexual 
forms derived from the breaking up of the chains, and a large 
number of these contained embryos—one only to each adult—in 
different stages of development. 
II. Norrs on tHe Breepinc Seasons or Marine ANIMALS AT 
PLYMOUTH. 
These notes are founded almost entirely on my own observations, 
and are necessarily incomplete, though, I believe, not inaccurate. 
My original intention was to continue such observations for at least 
another year before publication, in order to be able to present a 
fairly complete record ; but my departure from Plymouth has inter- 
fered with this plan, and, at the request of several friends, I publish 
