Variations. — Dorsal spines and tubercles varia- 

 ble in length. 



Habitat.— Found on almost all types of bottom 

 in the ocean and the saltier sounds. Occasionally, 

 large individuals are found on Bird Shoal near 

 Beaufort, N.C., in pools left by falling tide; fre- 

 quently specimens are brought up in otter trawls. 

 Immature individuals are often completely over- 

 grown with sponges, hydroids, or ascidians, but 

 the larger ones are usually almost clean. Near 

 shore to 25 fathoms. 



Type locality. — Cotes des Etats-Unis. 



Known range. — Cape Cod, Mass., to southern 

 Texas ; Bahamas and Cuba. 



Remarks. — This species has a geologic record 

 extending from the upper Miocene of Virginia 

 (Rathbun, 1935) through the Pleistocene of New 



Figure 232. — Libinia dubia H. Milne Edwards. Male 

 in dorsal view, legs of left side not shown, 10 mm. 

 indicated. 



Figure 233. — Subfamilies Ophthalmiinae, Aeanthonychinae, and Pisinae, tips of right first pleopods of males ; 

 A, Pitho Iherminicri (Schramm), abdominal view; B, Tyche emarginata White, lateral view; C, Sphenocarcinus 

 corrosus Milne Edwards, sternal view ; D, Epialtus dilatatus Milne Edwards, sternal view ; E, Pelia mutica 

 (Gibbes), sternal view; F, Nibilia antilocapra (Stimpson), abdominal view; G, Libinia dubia H. Milne Edwards, 

 lateral view ; H, Libinia emarginata Leach, lateral view ; 0.33 mm. indicated. 



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