, 
446 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
CUMACEA. 
Diastylis quadrispinosus G. O. Sars. 
Stations 871, 873, 878; 100 to 142 fathoms. 
STOMATOPODA. 
Lysiosquilla armata, sp. nov. 
This species appears to be closely allied to LZ. spinosa Miers, from the 
Indian Ocean and New Zealand, or at least more closely than to any of 
the other species contained in Mr. Miers’s recent review of the Squillide 
(Ann. Mag. Nat. Hist., V, v, pp. 1-49, pls. 1-3, 1880). 
The carapax is smooth and about once and two-thirds as long as the 
breadth at the anterior margin, which is about two-thirds of the greatest 
breadth. The rostral plate is about half as broad as the anterior part 
of the carapax, very slightly longer than broad, the lateral edges not 
angulated, but strongly convex in outline, and curved regularly round to 
the short but sharp and acuminate tip. The four exposed thoracic 
somites and the first abdominal somite increase rapidly in breadth pos- 
teriorly, but from the second to the fifth somite the abdomen is of a 
nearly uniform width, which is about equal to the length of the carapax. 
The free thoracic somites, like the anterior abdominal, are smooth and 
unarmed, except that the first somite projects downward either side in 
a lamellar, transverse, dentiform process below the posterior margin of 
the carapax. The five anterior abdominal somites are evenly rounded 
above and smooth, but the posterior edge of the fourth somite is armed 
either side for about a fourth of its length from the lateral margin with 
slender, spiniform teeth, directed backward, and the entire posterior 
margin of the fifth somite is armed in the same way. The sixth somite 
is about three times as broad as long, only a little narrower than the 
fifth ; the postero-lateral angle each side is armed with a stout, denti- 
form spine, back of and within which the dorsal surface is uneven and 
armed with five to seven spines or tubercles, of which the two or three 
most posterior are slender spines, but the others more or less tuberculi- 
form and inconspicuous; the middle portion of the dorsal surface is 
smooth, and the posterior margin, except a short space each side, is 
armed with slender, spiniform teeth, as in the fifth somite. 
The telson is nearly as wide as the sixth abdominal somite and about 
once and two-thirds as wide as long; the middle portion of the dorsal 
surface rises in a smooth, oval, longitudinal area, projecting behind above 
the posterior margin, limited each side by a line of short spinules, and 
its narrow posterior extremity truncated and three-lobed or obtusely 
tridentate; each side of this smooth area the surface is armed with many 
spinules or small tubercles, showing a tendency to arrangement in longi- 
tudinal lines; the lateral margins are expanded in front of the large 
lateral spines of the posterior margin and armed with a few spinules ; 
the posterior margin is armed each side with three spines, of which the 
