158 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Lysiosquilla maiag-uesensis, sp. nov. (Figs. 10 to 13. ) 
Provisional diagnosis . — A Lysiosquilla having triangular eyes, the corneal axis oblique and shorter 
than the peduncular one; raptorial claws with a slender dactylus bearing 8 to 10, usually 9, marginal 
teeth; small antennary scales, less than half the length of the carapace; appendages to the walking- 
legs linear; the apex of the broadly ovate rostrum acute; a smooth carapace slightly narrowed in front, 
with rounded angles, the posterior lateral angles being produced backward as broad lobes; the hind- 
body depressed and smooth, except for very narrow lateral marginal carinae on the first five abdominal 
segments, and six spines on the posterior margin of the sixth abdominal segment, the intermediate 
pair being continuous with low carinae; the telson wider than long, convex, with 3 dorsal carinae 
ending posteriorly in spines, narrow lateral marginal carinse, 6 marginal spines, of which the submedian 
pair are long and mobile, the intermediate ones large, extended downward below the ventral surface 
d 
Figs. 10-12, Lysiosquilla maiaguesensis. Male, camera drawings, xll. Fig. 10, head and carapace. Fig. 11, left raptorial 
claw; c, carpus; d, dactylus; m, rnanus. Fig. 12, side view of the telson, xll; m, submedian spine; i , Intermediate 
spine; Z, lateral spine. 
of the telson, and with a large rounded lobe on the dorsal side, lateral pair smaller, similarly curved 
and lobed; no submedian denticles, 2 intermediate and 1 lateral one on each side arising from the mar- 
gin; about 12 fine sharp serrations on the inner margin of the broad basal prolongation of the uropod, 
of which the inner tooth is much the longer; and 6 mobile spines on the exopodite, the distal one 
extending to or beyond the tip of the paddle. 
Remarks. — Unfortunately, the material is too scanty to allow more than a provisional description 
of this species, 2 small males being all that, is afforded by the collection. It is closely related to 
the preceding, but differs from it in a number of striking peculiarities. The first pair of antennae are 
shorter, the eyes are larger, the rostrum is as long as it is broad, and acute. (Compare figs. 5 and 10. ) 
But the most remarkable differences are to be found in the telson and the uropods. (Compare figs. 12 
and 13 with figs. 7, 8, and 9. ) The telson differs not only in being longer and having three dorsal 
spines, but to a greater degree in the form of the marginal spines and the mode of origin of denticles. 
