52 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



44. M. reticulata Goto, 1894 on Stromateus argenteus. 



45. M. salpae Par. and Per., 1890 on Box salpa. 



46. M. sargi Par. and Per., 1890 on Sargus rondeletii, S. annularis, 

 S. salviani, and S. vulgaris. 



47. M. sciaenae Goto, 1894 on Sciaena sina. 



48. M. sciaenicola Murray, 1932 on Sciaena antarctica. 



49. M. sebastis Goto, 1894 on Sepastes sp., S. maliger, S. caur- 

 inus, S. melanops, and Sebastodes schlegeli. 



50. M. sillaginae Woolcock, 1936 on Sillaginoides punctatus. 



51. M. sp. Linton, 1907 on Calamus calayyius. 



52. M. spari Yamaguti, 1937 on Spams longispinus. 



53. M. spinicirrus MacCal., 1918 on Aplodinotus grunniens. 



54. M. stenotomi Goto, 1899 on Stenotomus chrysops. 



55. M. trachini Par. and Per.. 1899 on Trachinus radiatus. 



56. M. truncata Goto, 1894 on Pristipoma japonicum. 



57. M. victoriae Woolcock, 1936 on Helicolenus percoides. 



58. M. virgatarum Tubangui, 1931 on Teuthis virgata. 



Microcotyle priacanthi, new species 

 (Plate 6, figs. 30-32) 



Host: Priacanthus sp. 



Location: Gills 



Locality: Hood Island, Galapagos Islands 



Number: 4 



Body long, slender, lanceolate, 2.980 to 4.333 mm. in length by 

 0.237 to 0.339 mm. in greatest width, tapering to a point at posterior 

 end, anterior end attenuated and bluntly pointed. Posterior haptor 

 long, approximately four fifths of total body length. Numerous 

 (approximately 200) small posterior suckers 0.044 to 0.048 mm. in 

 length by 0.060 to 0.064 mm. in width. Chitinous skeleton (fig. 32) 

 of seven pieces, a central inverted U-shaped piece, one arm of U 

 longer than the other and bifurcated at proximal end; two lateral 

 pairs, relatively slender; one pair at distal end of lateral pairs ex- 

 tending obliquely downward and toward center of sucker; one pair 

 across top of sucker, somewhat beaded in appearance and convex 

 on distal borders. Mouth subterminal, ventral. Pharynx almost 

 spherical, 0.032 to 0.036 mm. in length by 0.032 to 0.040 mm. in 

 width. Esophagus relatively short, bifurcating in front of genital 

 pore. Intestinal limbs with lateral branches ending blindly. Anterior 



