NO. 3574 COPEPOD CRUSTACEANS — LEWIS 189 



Maxilliped (fig. 70^) 2-segmented, situated in small concavity 

 slightly posterior and lateral to labium base. First segment with 

 shelflike indentation on distal half of inner siu"face, shelf with pair of 

 nodules forming depression receiving distal end of second segment 

 terminal process when segment flexed. Second segment small, sub- 

 conical, tipped by indistinctly separable, claw-shaped terminal process. 



Semicircular cuplike cuticular (?) formation present lateral to max- 

 illiped base, extending anteriorly to region of antennule base. Pos- 

 terior siuface of formation with pair of membranous, flangelike projec- 

 tions bearing fine indistinct grooves. 



Discussion. — The single specimen has several distinctive features. 

 The presence of the semicircular cuplike formation (adhesion pads?) 

 is found in TV. aulojn Yamaguti (1939c), although in this species they 

 are oriented in a longitudinal dhection whUe in the Hawaiian specimen 

 they are oriented laterally. The apparent lack of muscle bands in 

 the maxillae and the fusion of these 2 appendages to each other and 

 not the body surface may be diagnostic although it may instead suggest 

 an immatiu-e condition as Pearse (1952a, fig. 126) indicates for N. 

 spinosa Pearse. The possible immature condition of the specimen 

 may also explain the distinctive cuplike structiu"es. Yamaguti (1939c) 

 figures a distinct cuplike structm-e for a 3.2 mm specimen of N. aulopi 

 while Shiino (1958) states "striated pads just behind 2nd max- 

 illipeds [= maxiUipeds] rather low and inconspicuous" in a 5.07 mm 

 specimen of N. aulopi. Both of these authors figure the adult female 

 with eggs so that if this is a characteristic of immature specimens, 

 the pad is still present at the time ovulation commences. In adult 

 female specimens of N. variabilis Brian, deposited by R. Bere in the 

 U.S. National Museum (79146), there is no distinct process of this 

 type although there is a slight concavity in the same region and cm^ved, 

 heavily sclerotized rodlike structures are visible in the cuticle. 



The Hawaiian specimen appears to most closely resemble A^. varia- 

 bilis Brian. The similarity is not only in the general shape of the 

 body in the 3-segmented antennule although Pfllai (1962a) describes a 

 5-segmented appendage for this species. The antenna of the Hawaiian 

 specimen is here described as uniramous although with some question. 

 The maxfllides and maxiUipeds also are similar to those described 

 for A^. variabilis by Bere (1936) and Pillai (1962a). 



