Figure 40. — Pontonia marga/rita Smith. A, anterior part 

 of carapace in lateral view. X 11.5 ; B, anterior part of 

 body in dorsal view, X 11.5; C, first leg, X 5.9; D, 

 larger second leg, X 6; E, smaller second leg, X 6 ; F, 

 third leg, x 9-5 ; G, dactyl of third leg, X 35 ; H, telson 

 in dorsal view, X 11.5 (after Holthuis, 1951a). 



tooth and separated by a hole on inner side of edge, 

 posterior tootli with denticles at apex; carpus 

 shorter than merus, conical. Smaller second leg 

 resembling larger except for relatively longer 

 fingers. Dactyls of last three walking legs 

 bifurcate. 



Abdomen with pleura of first five segments 

 broadly rounded, of sixth ending in a strong spine 

 overlapping base of uropods. Sixth segment a 

 little more than half length of telson. Telson with 

 two pairs of large dorsal spines placed laterally, 

 and at one-third and two-thirds of length; pos- 

 terior border with three pairs of spines in a row, 

 inner two pairs equal, outer pair smaller. Uropods 

 broadly ovate, exopods ending in a minute mov- 

 able spine on outer margin. 



Measurements. — Length of body : male, 19 mm. ; 

 ovigerous females, 17 to 27 mm. 



Color. — Glassy, translucent ; internal organs 

 clearly visible; ovigerous females with two colors 

 of eggs, one with light, muddy green eggs and 

 ovarian ova of same color, another with pale 

 orange eggs (from specimens taken in Aequipec- 

 ten gibbiis off Drum Inlet, N.C., in 20-fathom 

 water, April 14, 1960). 



Habitat. — The species lives commensally in 

 lamellibranch mollusks in coastal waters. It has 

 been found in Aequipecten gibbus and Pteria 

 colymbus in North Carolina, and in the pearl 

 oyster Pinctada fitnbriata on the west American 

 coast; tidal flats to 33 fathoms. 



Type locality. — Bay of Panama. 



Known range. — Atlantic coast: Drum Inlet to 

 Beaufort Inlet, N.C.; east and west Florida. 

 Pacific coast : Gulf of California to Colombia ; 

 Galapagos Islands. 



Remarks. — Ovigerous females have been taken 

 in North Carolina in January and April. 



Genus Neopontonides Holthuis, 1951 



Holthuis. 1951a, p. 189. 



Neopontonides beaufortensis (Borradaile) 



Figure 41 



Periclimenes beaufortensis Borradaile, 1920, p. 132. 

 Neopontonides beaufortensis: Holthuis, 1951a, p. 190, pi. 59, 

 figs, g-k ; pi. 60, figs, a-k (rev.). 



Recognition characters. — Rostrum slender, 

 straight; a little shorter than antennular pe- 

 duncle; laterally compressed but broadened at 

 base, covering eyestalks, lateral margin of widened 

 base not merging with obital margin; upper 

 margin with none to five teeth, most proximal 

 teeth, when present, in front of posterior margin 

 of orbit on a crest, crest remaining visible in 

 absence of teeth; lower margin unarmed. Cara- 

 pace smooth or somewhat areolated; anterior 

 margin of carapace with lower angle of orbit 

 produced in a rounded lobe ; antennal spine strong, 

 located considerably below oi'bit; a rounded lobe 

 slightly below antennal spine followed by an 

 emargination ending in a produced anterolateral 

 angle; hepatic and supraorbital spines absent. 

 Eyes large, reaching almost to end of rostrum. 

 Basal article of antennular peduncle with sty- 



MARINE DECAPOD CRUSTACEANS OF THE CAROLINAS 



49 



