THE BRACHYURA AND MACRURA OF PORTO RICO. 
33 
Glyptoplax pusilla (A. Milne Edwards). 
Micropanope pusilla A. Milne Edwards, Crust. R6g. Mex., 327, pi. liv, f. 4, 1880. 
Glyptoplax pusilla Rathbun, Jour. Inst. Jamaica, ii, 628, 1899. 
Surface very finely granulate. Front with a median emargination; lateral lobes sinuous. A 
distinct lobe on superior orbital margin between the two fissures. Second normal tooth of lateral 
margin obsolete; third and fourth dentiform, prominent; fifth tooth slight, situated on postero-lateral 
margin. Carpus of chelipeds with a tooth at inner angle and a groove parallel to anterior margin; 
manus with superior proximal angle prominent, margined; height of larger palm nearly as great as its 
length; pollex scarcely deflexed: fingers unevenly dentate, fitting closely together, the dactylus having 
a large basal tooth; color of pollex does not extend quite to palm. The smaller cheliped differs 
considerably in size and has the fingers bent down, dactylus without a large basal tooth. The third 
abdominal segment reaches coxae of fifth pair of feet. Length of male, 4 mm. ; width, 5.2 mm. 
Gulf of Mexico, 17 to 35 fathoms; Oyster Bay, Florida; Jamaica. Porto Rico: Mayaguez Harbor, 
4 to 6 fathoms, station 6065; off Humajao, to 12£ fathoms, stations 6098 and 6099; off Vieques, 6 to 16 
fathoms, stations 6085, 6091, 6092, and 6096; off Culebra, 14| to 15 fathoms, stations 6086 and 6093; 
off St. Thomas, 20 fathoms, station 6080. The female from this haul has a rhizocephalic parasite on the 
abdomen. 
Genus ACT.7EA de Haan. 
Actxa de Haan, Fauna Japon., pp. 4 and 18, 1833. 
Carapace convex fore and aft, slightly convex or flat from side to side, usually broad, regions 
well demarcated by deep grooves and again subdivided into lobules, which are usually convex and 
granular. Antero-lateral borders usually four-lobed, but lobes shallow and often indistinct. Postero- 
lateral borders usually concave, always short, not strongly convergent. Front between a third and a 
fourth the greatest width of carapace, deflexed, cleft in middle line into two lobes. Upper edge ol 
orbit tumid, usually with two fissures or sutures; a third below outer orbital angle; eye-stalks short and 
thick. Antennules folding obliquely or nearly transversely. Basal antennal joint usually stopping at 
angle of deflexed front, but often prolonged beyond this, toward or nearly into orbit; flagellum about 
as long as orbit and lodged in the orbital hiatus. Merus of external maxillipeds with anterior border 
little oblique. Chelipeds equal in both sexes; fingers either acute or blunt-pointed, sometimes 
hollowed out at tip. Abdomen of the male five-jointed, somites three, four, and five fused. 
Key to the Porto Rican species of the genus Actxa. 
A. Carapace, chelipeds, and legs granulous, not spinous. 
B. Lobules of carapace very markedly isolated and very convex rufopunctata nodosa 
B'. Lobules of carapace not remarkably isolated. 
C. Fingers deeply grooved and granulated setigera 
C'. Fingers smooth bifrons 
A'. Carapace, chelipeds, and legs spinous acantha 
Actaea rufopunctata nodosa (Stimpson). 
Actxa nodosa Stimpson, Ann. Lyc. Nat. Hist. N.Y., vii, 203, 1860. 
Actxa rufopunctata var. nodosa Miers, Challenger Rept., Zool., xvn, 122, 1886. 
Carapace broad, ovoid, its extreme length not quite three-fourths, but more than two-thircls its 
extreme breadth; its surface broken by deep and broad grooves into numerous (about twenty-seven, 
excluding those around the orbits and the front) very convex lobules, which are covered very closely 
with large vesiculous granules; grooves filled with a dense short felt, with longer hairs sometimes 
interspersed, against which the lobules stand out like islands. Exposed surface of carpal and propodal 
joints of chelipeds and legs lobulated in same style as carapace. Front strongly deflexed, but some- 
what prominent and rather sharply bilobed. The tumid supraorbital margin broken by two cross 
grooves and separated from lower margin of orbit by a fissure. Antero-lateral borders cut into four 
rounded lobules of nearly equal size by deepish fissures. Outer angle of basal antennal joint in contact 
with inner angle of lower edge of orbit. Edges of legs and of arm fringed with coarse hair. Lower outer 
surface of hand with granules arranged in lines. Fingers blunt-pointed, hollowed out at tip. 
Length of female, 12mm.; width, 17.5 mm.; fronto-orbital width, 9 mm.; frontal width, 5 mm. 
Florida Reefs; West Indies; Bahia, Brazil (Miers). Porto Rico: Off Vieques, 6 fathoms, station 
6096; Ensenada Honda, Culebra; Fajardo. 
This form is perhaps not subspecifically distinct from A. rufopunctata of the Oriental and East 
Atlantic regions, but I have not the material to determine this point. 
2d— F. C. B. 1900—3 
