Mr. H. D.S. Goodsir on new species of Crustaceans. 325 
XXXVI.—On several new species of Crustaceans allied to Saphi- 
rma. By Harry D. 8. Goopstr, M.W.S., late Conservator 
of the Museum of the Roy. Coll. Surg. Edinburgh, Assist. 
Surgeon in H.M. Arctic Exploring Ship Erebus. 
One of the most striking features in the structure of this pecu- 
har form of Crustacean is the double eye in a single dark spot. 
The antenne are similar in form to those of the Jsopoda, being 
either filiform or almost truncate, the general form of these or- 
gans in the Jsopoda, and by no means like those of the Monoculi, 
which are setaceous and very often dilated in the middle. As in 
the Isopoda, they are short, being generally about as long as one- 
half of the breadth of the body. 
The animals here referred to have a projection from the me- 
sial line of the carapace, analogous to the rostrum, generally 
found in the Monoculi, and in the extremity of this rostrum the 
eye is generally situated. 
The first segment of the body is in all cases longer than the 
remaining segments combined, and in some instances the lateral 
edge is curved inwards and downwards, so as to give it the ap- 
pearance and form of a carapace. The remaining segments of 
the body are small, gradually decreasing from the second to the 
terminal. 
In several species the terminal abdominal segment is provided 
with a jomted pedicle on each side, which is armed at the extre- 
mity with spines, and in some species this structure is exactly 
similar to Monoculus. The anterior extremities are very short, 
so much so as not to be seen extending beyond the edge of the 
body ; generally however one or more joints of the last pair of 
legs are seen posteriorly. 
The most striking character in this order of animals is the 
double extremities, a character common to the Stomapoda and 
Monoculi as well as this form of Crustaceans. As in Stomapoda 
the two terminal filaments arise from one common pedicle, the 
external one being much longer than the internal ; the former 
also is chelate and three-jointed, the latter four-jomted. The 
number of joimts however in these legs varies. The legs arising 
from the carapace (first thoracic legs) are not double, or if so, one 
of the terminal filaments is obsolete. 
These animals are very active in their habits, and swim about 
in company with the other forms of the family Pontia. 
Body depressed as in the Isopoda; posterior thoracic legs 
double. 
Sterope ovalis. Plate XI. fig. 11. 
Rostrum not prominent; antennz unarmed, three- or four- 
