332 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



6. Lygdamis phlippinensis (Treadwell). 



7. " porrectus (Ehlers) (Johansson, 1927, p. 86) from west Su- 

 matra, in 1,280 meters. 



8. ?Lyffdamis tenerus (Augener) from the Barbados Island in 200 fms. 

 Johansson (1927, p. 86) has referred this to Lygdamis; however, 

 since it is said to lack nuchal hooks and even palpi (designated "die 

 beiden machtigen Mundcirren"), it is doubtful whether it belongs 

 here. The type and only known specimen was an anterior fragment 

 only 1 cm long; it is not known to exist where it was said to be 

 deposited. 



The 3 species discussed below are separable as follows, 



1. Paleae of inner row numerous and much coarser than those of 

 outer row L. nesiotes 



1. Paleae of inner row of few, only 3 to 5 pairs, those of outer series 

 conspicuous, larger, and numerous 2 



2. Paleae of outer series broad, spatulate (pi. 31, fig. 30) . . . 

 L. asteriformis 



2. Paleae of outer series long, tapering, though somewhat flattened 

 L. philippinensis 



Lygdamis nesiotes (Chamberlin) 

 Tetreres nesiotes Chamberlin, 1919, pp. 490-493, pi. 75, figs. 1-7. 

 ITetreres treadwelli Ploagland, 1920, p. 627, pi. 3, figs. 14-23. 

 Johansson, 1927, pp. 84-85. 

 Idanthyrsus pennatus Hartman, 1939, p. 19 (not Peters). 



Collection. — 28-33 ( 1 ) . 



Other material examined. — At the U.S. Nat. Mus,, type specimen 

 (no. 19742) from Fakarava, Paumotu Islands, from fringing reef; Cor- 

 regidor Light between Cebu and Leyte, off south Luzon, Philippines, 

 Albatross station no. 5109 (1); Makemo, Paumotu Islands, Albatross 

 station ( 1 ) ; Clipperton Island, shore ( 1 ) . 



The opercular paleae are arranged in 2 well-developed rows, the 

 outer paleae much finer than the inner ones. There are about 17 pairs 

 in the inner, and about 29 pairs in the outer row. The inner paleae are 

 thick, straight, slightly flattened, but taper to blunt, distal ends. The 

 outer, paler, finer spines are bent inward at their distal end, nearly at 

 right angles to the main shaft ; they taper to a point at the free end. The 2 

 nuchal spines are heavy, dark brown, strongly U-shaped distally. There 

 are 10 to 14 pairs of elongate cirri surrounding the opercular paleae, in 

 a single series ; this membrane appears serrulate. The oral tentacles form 

 about 12 transverse rows on each side of the mouth. 



