THE BRACHYURA AND MAORURA OF PORTO RICO. 
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margin cut into small truncate teeth separated by closed fissures and with denticulate margins. The 
lateral expansions do not quite cover the feet when extended. Surface smooth and shining. Front 
triangular and flattened. Merus of maxillipeds triangular, its internal angle truncate. Upper surface 
of arm and hand of cheliped dilated toward middle; margins with a few obscure teeth, also denticulate. 
Crests of legs denticulate. Sternum very concave in front; a deep hollow fits terminal segment of 
abdomen; on each side of this hollow is a strong dentate crest prolonged to basal article of cheliped. 
Dimensions of male: Length, 6.5 mm.; width, 7.7 mm. 
Off St. Thomas, 20 fathoms, station 6080, 1 female ( Fish Hawk ) . Gulf of Mexico, Florida Keys, 
and Bahama Banks, 19 to 34 fathoms. 
Genus HETEROCRYPTA Stimpson. 
Heterocrypta Stimpson, Ann. Lyc. Nat. Hist. N. Y., x, 102, 1871. 
Differs from Cryptopodia in having posterior border of carapace slightly overlapping abdomen 
but not distinctly produced; lateral clypeiform expansions less produced, so that the legs when even 
moderately extended can be seen beyond them; pterygostomian and subhepatic regions traversed b 
a granular ridge which runs parallel to antero-lateral border from angle of buccal cavity to base o. 
chelipeds. 
Key to the. Porto Rican species of the genus Heterocrypta. 
A. Length of carapace two-thirds or less of the width granulatci 
A'. Length of carapace nine-tenths of the width lapidea 
Heterocrypta granulata (Gibbes). 
Cryptopodia granulata Gibbes, Proc. Amer. Assoc. Adv. Sci., in, 173, 1850. 
Heterocrypta granulata Stimpson, Ann. Lyc. Nat. Hist. N.Y., x, 102, 1871. 
Carapace very wide, length two-thirds the width; the branchial ridge runs almost parallel to 
antero-lateral margin, except on gastric region, where it is transverse; from either end of this trans- 
verse portion a longitudinal crest runs forward to upper margin of orbit. A large dome-like elevation 
on cardiac region, granulated at summit. General surface smooth and punctate; margins crenulate. 
Portion of margin between antero-lateral margin and the branchial ridge straight. The posterior 
margin forms with the preceding an angle scarcely perceptible except in a rear view. Rostrum 
broad, blunt, and deflexed, margins rounded. Lower surface is granulous. Merus of outer maxillipeds 
notched at inner angle. Chelipeds unequal, rather short and heavy. LTpper surfaces of arm and hand 
dilated toward middle; margins irregularly denticulate. Fingers of larger cheliped gape, those of 
smaller do not. Merus of last pair of feet barely visible in a dorsal view. Third, fourth, and fifth 
segments of abdomen of male are fused; sixth seg- 
ment has a sharp posterior, appressed spine, the tip 
of which lies between two tubercles on fifth segment. 
Dimensions of female: Length, 14.5mm.; width, 
21 mm. 
Vineyard Sound to the west coast of Florida; 
West Indies. Mayaguez, 1 male. 
Heterocrypta lapidea, sp. nov. 
Carapace much narrower than in IP. granulata., 
the length being nine-tenths of the width; some 
of the granules of branchial ridges are thrown up in 
tubercles, one at gastric terminus of either ridge; a 
well-defined angle at other end of branchial ridge; 
margin concave between this angle and end of antero-lateral margin. A median furrow across front 
and anterior gastric region. Chelipeds longer and narrower than in //. granulata; margins of arm 
subparallel; dentation of margins stronger but similar to that of H. gramdata. 
Dimensions of female: Length, 5.9 mm.; width, 6.6 mm. ; length of outer margin of arm and 
hand, each 4 mm. 
One female taken at St. Thomas by the Albatross during a West Indian cruise (Cat. No, 20324, 
type). Mayaguez, 1 young specimen. 
Fig. 13. — Heterocrypta lapidea , female, x 4. 
