THE BRACHYURA AND MAORURA OF PORTO RICO. 
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Portunus ventralis (A. Milne Edwards). 
Neptunus ventralis A. Milne Edwards, Crust. Reg. Mex., 215, pi. XL, f. 3, 1879. 
Carapace of moderate width, very uneven, covered with a short pubescence, out of which arise 
the granulations of the elevated portions of carapace. Front slightly advanced. The two middle teeth 
are smaller than the lateral; the projection from epistome is visible between them; inner orbital angles 
blunt. Antero-lateral teeth small, widely separated, very granulous at base, their points directed 
more forward than usual. Lateral spine as long as the space occupied by the three last teeth and 
directed obliquely backward. Pterygostomian regions covered with hairs, which conceal the 
granulations. Merus of outer maxillipeds little advanced and bordered on front and sides with a 
prominent margin. Merus of chelipeds with four anterior spines and a posterior distal spine; carpus 
with an inner and an outer spine; three spines on manus, one next the carpus, the others on upper 
margin at distal and near distal end. Ambulatory legs short.- Merus of swimming feet without a spine. 
Dimensions of male: Entire length, 15 mm.; entire width, 30 mm.; width at sinus in front of 
lateral spines, 23.7 mm. 
Guadeloupe (type locality) . Porto Rico: Mayaguez; off Puerto Real, 8J fathoms, station 6074; 
Boqueron Bay; Ponce reefs; Ensenada Honda, Culebra. 
Portunus sulcatus (A. Milne Edwards). 
Neptunus sulcatus A. Milne Edwards, Crust. R6g. Mex., 216, pi. xxxix, f. 3, 1879. 
Very similar to P. ventralis. Carapace more even. Second, fourth, and sixth teeth noticeably 
smaller than the others; the lateral spine curves forward. 
Dimensions of female (one of type lot): Entire length, 10.5 mm.; entire width, 21.2 mm.; width 
at sinuses in front of lateral spine, 15.7 mm. 
Coast of Brazil, lat. 11° 49' S., long. 37° 21' W., 12 to 17 fathoms, Hassler (type locality); Cape 
Frio, Brazil (Copenhagen Mus. ); off Georgia and northern Florida (Copenhagen Mus.) ; Gulf of 
Mexico and Caribbean Sea, at the surface. Mayaguez, Porto Rico, 1 young male. 
Subgenus ACHELOUS de Haan. 
Achelous de Haan, Fauna Japon., pp. 3 and 8, 1833. 
Carapace narrow, the antero-lateral margin being the arc of a circle with short radius, whose 
center is near center of cardiac region. Last spine of antero-lateral margin usually not much if any 
larger than the others. 
Portunus (Achelous) spinimanus Latreille. 
Portunus spinimanus Latreille, Nouv. Diet. Hist. Nat., xxvm, 47, 1819. 
Portunus ( Achelous ) spinimanus de Haan, Fauna Japon., 8, 1833. 
Achelous spinimanus A. Milne Edwards, Crust. R<5g. Mex., 230, pi. xxxrx, f. 2, 1879. 
Carapace pubescent, sculptured, the raised parts covered with granulations. The nine teeth of 
antero-lateral borders are about equal except the last, which in the old surpasses the others a little, 
and in the young is considerably longer. Inner orbital angles bifid; the median teeth of the front are 
more advanced than the others. All the frontal teeth are acute. Merus of outer maxillipeds very 
long and slightly excavate for articulation of palpus. Chelipeds strongly developed in adult male; 
arm with four spines in front and one behind; wrist and hand armed with two spines each. Hand 
elongate, with five tubereulated ridges on outer and upper surface. Merus of swimming feet short, 
wide, and unarmed. » 
Dimensions of male: Length to sinus, 52.5 mm.; extreme length, 54.2 mm.; extreme width, 
90 mm. This is the largest of the West Indian species of this genus. 
From Virginia to Rio de Janeiro, Brazil; Gulf of Mexico; Bermudas (Rankin). Porto Rico: 
Mayaguez; Mayaguez Harbor, 7 fathoms, station 6059; Boqueron Bay; Puerto Real. 
Portunus (Achelous) depressifrons Stimpson. 
Achelous depressifrons Stimpson, Ann. Lye. Nat. Hist. N. Y., vn, 223, 1860; A. Milne Edwards, Crust. Reg. Mex., 230, pi. XL, 
f. 4, 1879. 
Carapace convex behind and in the median region, but flattened toward the anterior and lateral 
borders. Width about 1.5 times the length. Surface rugose and pubescent. Antero-lateral border 
ciliated; teeth equal, the last scarcely longer than the next. Front very little produced; median pait 
divided into four almost equal teeth. Inner orbital tooth simple. Superior border of orbit cut by two 
