NO. 3556 PORTUNID CRABS—STEPHENSON AND REES 41 
indistinctly separate from mesogastrics, which themselves typically 
bear ridgelike anterior terminations. Metagastric area sometimes 
bears two granular areas separated in midline, and sometimes a single 
continuous area with central ridge or tubercle. Two conspicuous 
anterolateral patches, anterior being the larger. Three pairs of 
mesobranchials, the anterior often subdivided into larger anteroexter- 
nal and smaller posteromedian patch. Central mesobranchial either 
oval or rectangular; posterior either short line of granules or small 
tubercle formed of fused granules. Cardiacs conspicuously elevated, 
usually triangular, and with ridgelike or tubercle-like anterior termina- 
tion. Lateral postcardiacs large and oval, median postcardiac small 
and with ridgelike or tuberculate anterior termination. Postero- 
laterals forming an are. 
Anterolateral teeth: Fourth and sixth the smallest, occasionally 
one or the other rudimentary or absent. 
Posterodistal border of merus of fifthlegs: Finely serrated. 
VARYING FEATURES.—Features that vary within a form are de- 
scribed below under each form respectively. 
FORM I 
Frontal teeth: Median tooth usually shorter than laterals, but 
sometimes projecting forward slightly farther. Lateral teeth varying 
from acute to bluntly rounded. 
Length of last anterolateral tooth: Varying within a collection 
depending on size of specimen, e.g., Sta. 5157 specimens less than 20 
mm. carapace breadth with long tooth (equivalent in length to three 
or four preceding teeth), and specimens greater than 35 mm. breadth 
with short teeth (equivalent in length to one and a half preceding 
teeth). Also varying from collection to collection. Overall from 
lengths of one and a half to six preceding teeth. 
Posterior-posterolateral junction of carapace: Sometimes distinctly 
acute, sometimes slightly more acute than a right angle, typically 
obtusely angled, sometimes obtusely rounded. Acuteness varies 
within a collection (acuter teeth in smaller specimens) and also between 
collections. 
General granulated areas of carapace: Typically coarsely granular 
and conspicuously elevated. In some collections more finely granular 
and less conspicuous, in others more conspicuous and tending to form 
elevated tubercles. 
Male abdomen: Length of penultimate segment varying from 
slightly longer than broad to conspicuously so. Length of ultimate 
segment also varying. 
