PELTIDIUM. L6t 
sete short and stout. Hyes large and of a bright 
ruby red, situated considerably behind the origin of 
the first pair of antenne. Integument dense and 
tough; colour yellowish olive, except the second and 
third segments, which are of a deep bluish purple, the 
fourth and fifth segments also more lightly stained 
with the same colour. Length yg9th of an inch 
(1:33 mm.). 
This beautiful species haunts chiefiy the fronds of 
Laminarie, and will probably be found wherever 
L. saccharma grows. Mr. Norman notes it as being 
abundant at. Hillswick, Shetland; Mr. Spence Bate 
has found it at Plymouth, and Dr. Baird in Berwick 
Bay. I have found it at Sunderland and Cullercoats, 
and in Clifden Bay, Ireland. It does not often occur 
amongst. dredged material, but I noticed it on one 
occasion amongst coarse sand from a depth of four 
fathoms at Sunderland. 
It is possible that Philippi’s figure may be intended 
to apply to this species, but if so it is unfortunate, 
and must have been taken from a specimen distorted 
by pressure. At any rate there can be no doubt that, 
though the figures are poor, Dr. Baird’s description 
of Alteutha depressa is applicable to this and to no 
other British species.* I have therefore adopted his 
specific name, regretting the necessity of discarding 
the more characteristic ones of Philippi and Norman. 
* Specimens wholly without colour are sometimes met with, and I 
do not doubt that it was from such a one that Dr. Baird drew his 
figures and descriptions. In any other case it would have been im- 
possible for him to omit noting the very striking coloration ofthe 
animal. 
VOL. II. L 
