PORTO RICAN ISOPODA. 
169 
CORAUANM. 
Corallana tricornis I Iansen. 
Body 2.75 to 3 times as long as broad. The head in the male is concave above, in the median 
line produced into a process projecting upward and forward, and with a smaller but prominent 
process at the upper inner margin of each eye. In the female the head is slightly concave above, 
rounded in front, and without either frontal or supraocular processes, about 2.5 times as broad as long. 
In the male the first thoracic segment is very convex and furnished with two tubercles near its 
anterior edge, which are absent in the female. The fifth thoracic segment is longest and broadest, the 
first, fourth, and sixth almost as long, the rest shorter. 
The abdomen is about as long as the width of the body, in some specimens the first segment 
being exposed, on others it is more or less completely covered by the last thoracic segment. The first 
four segments are subequal, the fifth a little longer and narrower, all with small tubercles on posterior 
margin; third, fourth, and fifth segments with a median dorsal depression. Telson triangular, abruptly 
narrower behind attachment of uropods, the middle of the lateral margin incised. Tip of telson 
with four spines; margin from front of lateral incision with long setfc, a row of short setae near front 
edge of incision, and a longitudinal column on each side of middle line. Telson somewhat concave in 
middle line and also depressed on each side between the lateral incision and the base; not ornamented 
with tubercles. 
First antennae about as long as pedifncle of second antennae, peduncle 2-jointed, flagellum 9 to 10 
jointed. Flagellum of second antennae about 1.5 times as long as peduncle, about 20 joints. Uropods 
extending beyond end of telson, outer branch narrow, bifid at tip, inner ramus broad, nearly two- 
thirds as broad as long, with 9 or 10 spines; margins of both branches with long setae. 
Twelve specimens from a ray taken at Hucares, 8.2 by 2.8 mm. 
A LC I RON I DTE. 
Key to Porto Rican genera and species. 
a. First maxillre greatly enlarged, very conspicuous, not concealed by other mouth parts, stout, 
with one strong, curved apical spine, and an internal knob-like process on the outer 
joint; the inner joint capped by an expanded papillose disc Nalicora, new genus. 
Only species N. rapax, new species. 
aa. First maxillfe not conspicuous, more or less concealed by other mouth parts, with two smaller 
curved spines on outer joint; inner joint not expanded at apex Alciroua. 
Only Porto Rican species A. hirsute, now species, 
NALICORA, new genus. 
Clypcus small, peduncle of second antennae long; mandible weak, with bidentate cutting edge 
and 3-jointed palp; first maxillae very large, robust, and conspicuous in situ, outer joint stout, hooked, 
and terminated by a strong, curved spine in the male, continuous in contour with the rest of the part 
and with a knob-like process at its base; inner joint with its tip covered by a quadrate, curve-faced 
cap covered with papillae; second maxillae 4-jointed, first two joints stout, short, third joint stout 
and subconical, terminal joint slender and conical, with a tuft of setae near tip; palp of maxillipeds 
5-jointed, slender. 
This genus somewhat resembles Lanocira, but the characters of the maxillae serve to differentiate it. 
Nalicora rapax, new species. 
Body convex, about 2.3 times as long as broad, first thoracic segment longest, next five about 
two-thirds as long and subequal, last shorter; posterior four thoracic segments with a row of setae 
across middle and another on posterior margin, hairiness increasing posteriorly, occasionally a few 
setae on second and third. Fifth segment broadest. 
Pleon and telson about two-fifths as long as rest of body. Pleon of four visible segments, first 
short and narrower than second and third and hidden at side by seventh thoracic; second somewhat 
produced at posterior lateral angle; third segment strongly produced, angle reaching to beyond base 
of uropods. 
