190 University of California Publications in Zoology [Vou. 23 
Family CALAPPIDAE 
Carapace rounded, crab-like; afferent (incurrent) openings to gill chambers lie 
in front of the chelipeds. Third maxillipeds do not completely close the buccal 
eavern; palp of maxillipeds always exposed. Antennae small. Legs normal in 
size and position. Abdomen hidden under the thorax. Male genital openings 
coxal, female sternal. 
Genus Mursia Leach, Desmarest 
Carapace strongly convex, transversely oval, with a strong lateral spine on 
each side; front narrow. Chelipeds large; when folded fitting close to the body; 
hands large, compressed distally, widened, surmounted by a laminate and dentate 
crest, and furnished with a longitudinal, granulated ridge near the lower side of 
the outer surface. 
Mursia gaudichaudii (Milne Edwards) 
Platymera gaudichaudii Milne Edwards, Hist. Nat. Crust., 2, 108, 1837; 
Milne Edwards and Lueas, in D’Orbigny’s Voy. dans 1’Amér. Mér., 6, 
pt. 1, p. 28, 1843, pl. 13, 1847; Holmes, Occas. Papers Calif. Acad. Sci., 
7, 99, 1900; Rathbun, H. A. E., 10, 170, 1904. 
Mursia gaudichaudit Weymouth, Stanford Univ. Publ., Univ. Ser., no. 4, 19, 
1910. 
Fig. 118. Mursia gaudichaudii (after Milne Edwards and Lucas). 
Characters.—Carapace strongly convex; anterior margin of front truncated 
and strongly coneave when seen from in front; postorbital tooth very small; 
anterolateral margin regularly arcuated, armed with about fifteen small teeth 
separated by concave interspaces; lateral spine large, straight, subcylindrical. 
Hands of chelipeds furnished with several small tubercles on outer surface; ridge 
on lower portion of outer surface very large, bearing a small tooth near proximal 
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