known from North Carolina in June and July. 

 Pohl (1946) counted 8,170 attached eggs on one 

 female. Pinnixa cristata has been found as a 

 commensal in the burrows. 



Callianassa (Callichirus) atlantica Rathbun 

 Figure 79 



Callianassa stimpsoni Smith, 1873c, p. 549, pi. 2, fig. 8. — Hay 

 and Shore, 1918, p. 406, pi. 29, fig. 5. 



Callianassa atlantica Rathbun, 1926, p. 107. — de Man, 1928, 

 p. 37 (rev.). — Rathbun, 1935, p. 104. — Schmitt, 1935b, p. 4. 



Recognition characters. — Integument smooth, 

 shining, thin, almost membranous. Carapace 

 about one-third length of abdomen, thin but with 

 oval thickened plate on gastric region. Rostrum 

 small, acute, flanked by a small triangular promi- 

 nence at each side on frontal margin. Eyestalks 

 small, flat, contiguous medially; pointed tips 

 slender, curved outward and upward; cornea 

 small, situated on outer border. Antemiular 

 peduncles about one-half length of carapace; 

 flagella about as long as distal article of peduncle, 

 densely hairy below. Antenna slender, longer than 

 carapace; peduncle much shorter than that of 

 antennules, bent between second and third articles. 

 Third maxilliped operculiform; dactyl slender. 



Chelipeds unequal, showing sexual dimorphism. 

 Larger cheliped of male with fingers about equal 

 in length, hairy, tips incurved; cutting edge of 

 dactyl with a long, low, truncate tooth at base, 

 smaller teeth distally; immovable finger with 

 small teeth; palm hairy below, upper border 

 ridged along proximal two-thirds ; carpus as wide 

 as but shorter than palm, upper and lower border 

 ridged; merus articulating with carpus by ex- 

 treme upper angle, a prominent, denticulate tooth 

 on lower border proximally; ischium with six or 

 seven subacute teeth on lower border. Smaller 

 cheliped of male with fingers a little longer than 

 palm ; carpus four times as long as broad distally, 

 a little longer than palm, half again as long as 

 merus; merus twice as broad as long. Larger 

 cheliped of female, less toothed than in male; 

 smaller cheliped as in male. 



Abdomen with third to fifth segments of about 

 equal width, each with a small patch of fine hairs 

 on posterolateral angle; sixth segment broader 

 than long. Male with no pleopods on first and 

 second segments. Female with uniramous pleo 

 pods <>ii first segment : slender, biramous pleopods 

 on second segment ; remainder well developed in 



Figure 79. — Callianassa {Callichirus) atlantica Rath- 

 bun. A, frontal region in dorsal view ; B, frontal 

 region, eyestalks and antennules in dorsal view ; C, 

 sixth abdominal segment, right uropod and telson in 

 dorsal view (after de Man. 1928). 



both sexes. Telson nearly as long as broad; sub- 

 truncate distally, corners rounded. Exopods of 

 uropods broader than endopods, both rami 

 densely fringed with hairs distally. 



Measurements. — Length of l>ody: male, 59 

 mm. ; female, 68 mm. 



Habitat. — Muddy shores and bottoms in shal- 

 low water (Sumner, Osburn, and Cole, 1913a, b) : 

 shoreline to approximately 21 fathoms. 



Type locality. — "Qui- species ranges from the 

 (•(last of the Southern [United] States north to 

 Long Island Sound" (Smith, 1S7:'.c). 



102 



FISH AND WILDLIFE SERVICE 



