HAWAIIAN ACANTHURID CALIGOIDS — LEWIS 233 



legs platelike, composed solely of protopodite ; fifth legs absent. 

 Caudal rami armed with setae. 



Remarks.- — -The diagnosis was taken from Olsson (1869) and 

 Wilson (1932) although recent description of new species of this 

 genus indicates the need for some revision. In addition to distinct 

 morphological characteristics, the proportional relationships of the 

 various body parts have been used as specific characteristics. The 

 validity of this method, especially in a degenerated form such as that 

 of the species in this genus, is dependent upon the degree of difference 

 between the species and the number of specimens available; the 

 amount of variation present, at least in the species described below, 

 is sufficient to warrant careful consideration of the body parts being 

 compared. 



Peniculus calamus? Nordmann, 1864 



Figures 24a-g 



P. calamus Nordmann, 1864, pp. 515-517, no figures. — Wilson, 1917, p. 45 

 [in key].— Shiino, 1956b, pp. 597, 599, 603. 



Present hosts (original host unknown). — Acanthurus dussumieri 

 Cuvier and Valenciennes, Acanthurus mata (Cuvier), Acanthurus 

 olivaceous Bloch and Schneider, Acanthurus triostegus sandvicensis 

 Streets, Ctenochaetus strigosus (Bennett), Naso hexacanthus (Bleeker), 

 Naso unicornis (Forskal). 



Type locality. — Hawaii. 



Material. — Two matm-e females taken by author from caudal 

 fin of specimen of Acanthurus dussumieri Cuvier and Valenciennes 

 taken by poison off Waikiki, Oahu, Hawaii, by Dr. William Gosline 

 and others. Four matm'e females taken by author from caudal fin 

 of specimen of A. dussumieri captm*ed in fish trap between Diamond 

 Head and Koko Head, Oahu, Hawaii, by Samuel Kaolulo. Six 

 matm-e females taken by author from anal and pectoral fins of 

 specimen of Acanthurus mata (Cuvier) captured in fish trap between 

 Diamond Head and Koko Head, Oahu, Hawaii, by Samuel Kaolulo. 

 (USNM 105110-105112.) 



Measurements. — Average length from anterior end of head to 

 posterior end of abdomen, excluding projecting second antennae and 

 egg strings, 2.85 mm.; range 2.30-3.31 mm. Average of greatest 

 length of head, excluding projecting second antennae, 0.32 mm.; 

 range 0.29-0.36 mm.; average of greatest width 0.22 mm.; range 

 0.21-0.25 mm. Average of greatest length of neck (first, second, and 

 third thoracic leg-bearing segments) 0.20 mm.; range 0.15-0.22 mm. 

 Average of greatest length of combined fourth thoracic leg-bearing 

 segment, genital segment, and abdomen 2.39 mm.; range 1.84-2.85 

 mm. Average length of egg strings (eight specimens) 2.94 mm.; 

 range 2.12-3.86 mm. 



679-677—64 7 



