PART 1 GARTH : PACIFIC OXYRHYNCHA 49 



Additional localities recorded, with collectors: Galapagos Islands: 

 off Daphne Minor, 70-80 fathoms, Barrington Island, 48 and 73 

 fathoms, north of Hood Island, 20-40 fathoms, Velero III (Garth, 

 1946). 



Atlantic analogue: Anomaloth.tr frontalis (A. Milne Edwards). 



Diagnosis: Postorbital spine longer than preorbital. Third leg slightly 

 shorter than fourth. A single spine on carpus of cheliped. Merus of third 

 leg entire. Carapace little produced posteriorly; no tubercle in front of 

 posterior margin. Tip of male pleopod bluntly pointed, aperture with a 

 spine-fringed lip. 



Description: Carapace pyriform, smooth and bare, regions faintly 

 indicated. Cardiac area slightly more elevated than gastric. Rostrum 

 curving gently downward, length little more than twice breadth, horns 

 cleft to base but contiguous the greater part of their length, diverging 

 slightly in distal third and bearing a row of short setae on outer margins. 

 Basal article of antenna visible in dorsal view. Preorbital spine minute, 

 postorbital spine prominent. Eyes large, eyestalks constricted at base of 

 cornea. A few scattered spinules on hepatic, pterygostomian, and 

 branchial areas. Posterior margin but little protruding; no spine or 

 tubercle at posterior median angle. 



Merus of cheliped armed with five stout spines beneath. Carpus with 

 a superodistal spine. Manus moderately inflated in female ; dactyl three- 

 fourths as long as propodus; fingers gaping in a broad oval. First 

 ambulatory leg much the longest, over twice length of carapace, in- 

 cluding rostrum ; second leg one and two-fifths times length of carapace ; 

 third and fourth legs shorter, subequal, the third being slightly shorter 

 than the fourth, its merus less robust. Dactyl of first leg more than 

 four-fifths length of propodus, that of second leg three-fourths propodal 

 length; dactyls of legs three and four little more than half as long as 

 those of leg two, dactyli of all legs save those of the first pair dentate. 



Antennae extending beyond rostrum, basal article narrow, antennal 

 spine minute. Merus of third maxilliped rounded at outer angle; ischium 

 and merus spinulous along inner border, segments of palpus shortened, 

 robust. (Garth, 1939, condensed) 



Male abdomen widest at base of third segment, narrowing to middle 

 of sixth segment, seventh segment narrowly triangular. (See text-fig. 2) 



