THE STOMATOPODA OF POETO EICO. 
157 
Remarks . — It is not possible to give more than a provisional description of this species at present, 
because the only material available is one very small male specimen. It is very probable that full-grown 
individuals will be found to differ from this specimen in important details. This is especially probable 
in regard to the female, for sexual dimorphism is not uncommon in other species of the genus. Never- 
theless, the form here described differs so clearly from any previously described species of Lysiosquilla 
that it seems worth while to place it upon record. The most nearly related species are Lysiosquilla 
spinosa Wood-Mason and L. maiaguesensis n. sp. It differs from the former in the absence of spines 
on the submedian dorsal carinse of the telson, in having the mobile spines of the telson longer than the 
others, and in having no submedian and only one intermediate denticle. (Fig. 7.) The differences 
from the latter will be discussed when we come to that species. 
L. plumata is not identical with L. tricarinata (Gray), White (’47), for according to Miers (’80) 
that species has about a dozen minute intermediate denticles. 
Figs. 5-9, Lysiosquilla plumata. Male, camera drawings, xlFj Fig. 5, head and carapace. Fig. 6, right raptorial claw. 
Fig. 7, last three abdominal segments. Fig. 8, side view of telson. Fig. 9, right uropod viewed from ventral side; 
bp, basal prolongation. 
Color . — The color pattern is indicated in the alcoholic specimen by the presence of dark branching 
pigment cells. There is an eye-spot at each posterior lateral angle of the fifth thoracic segment, a dark 
spot on the two sides of the central carina of the telson, and accumulations of pigment on the sides of 
the telson, the terminal segments of the uropod, the posterior lobes of the carapace, and at the base of 
the rostrum. More scattered pigment cells indicate a symmetrically mottled pattern covering the 
whole dorsal surface. ( Figs. 5 and 7. ) 
Size . — The specimen in hand has the following dimensions: Total length, 15.0 mm.; length of 
carapace on mid-line, 2.8 mm. ; width of carapace, 2.6 mm. ; width of fifth abdominal segment, 3.0 mm. ; 
length of telson, 1.4 mm.; length of antennary scale, 1.2 mm. 
Locality . — One male specimen was taken by the Fish Hawk at station 6062 in Mayaguez Harbor, 
Porto Eico, using the dredge on a bottom of sand, mud, and shells, at a depth of 25 to 30 fathoms. 
