54. PROCEEDINGS OF THE NATIONAL MUSEUM yOL. 92 
terior border. Antennules and antennae bearing rami and geniculate 
spines. Antennal acicle cordate, nearly twice as long as wide. Tel- 
son with median and submedian carinae only. 
Description.—Anterior width of carapace slightly more than half 
the length, exclusive of rostrum. Anterolateral angles not spined. 
Rostrum wider than high, without carina. Carapace smooth and 
shining, with only a suggestion of a median carina. The cervical 
groove does not cross the median area, although it does interrupt the 
gastric groove. 
The cornea are subtransversely placed on their stalks; the inner 
margin of the stalk is shorter than the outer; on the median line the 
stalks and cornea are equal in length to the width of the rostrum, 
as is also that portion of the stalk proximal to the cornea. The distal 
margin of cornea is emarginate, with a median U-shaped groove, from 
which on either side it rises to a rounded crest, thence into a saddle 
or depression, and finally to a blunt rounded peak. The effect on 
looking at this scalloped edge from above is that the margin is 
beaded, owing to the protruding facets of the cornea; it does not 
form a distinct line when viewed from the front. 
The antennules are armed with geniculate spines and rami. The 
antennae possess rami at their distal ends. The antennal acicle is 
cordate, with a heavy median longitudinal vein; in the proximal half 
it is wider than half its length. 
There is no mandibular palp. 
The outer inferior angle of the merus of the raptorial leg is 
rounded; the carpus has a groove and keel above, the latter entire 
and terminating distally in a rounded-off right angle; the propodus 
is armed with the usual three spines and series of pectinations; the 
dactylus is armed with four teeth including the terminal one; the 
outer margin of the dactylus is angled posteriorly and notched just 
before the angulation. In all respects the raptorial leg is subsimilar 
to that of S. swetti Schmitt. 
The free thoracic somites are smooth and have carinae on the last 
three somites in line with the intermediates of the abdomen other 
than the marginals; the fifth somite has a pair of curved carinae, 
one on its proximal, the other on its distal anterolateral margins, al- 
most meeting on the median line, that of the distal margin terminat- 
ing in a forward-pointing spine, that of the proximal ending in a 
small ventral spine beneath the other; lateral margins of the sixth 
and seventh somites rather truncate, with rounded angles. Epipo- 
dites on the first three thoracic limbs only, accessory branches of the 
last three pairs of legs 1-jointed. 
* Allan Hancock Pacific Expeds., vol. 5, No. 4, p. 146, fig. 3, 1940. 
