78 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 15 



fibers within ; they extend the full length and are appressed closely near 

 the tip, but spread outward toward the base, so as to encompass the 

 large, clear basal cell (fig. 11). When an organ is broken crosswise the 

 fibers break off at uneven lengths, exposing their structural details. The 

 same effect is to be seen on most preserved materials, since broken organs 

 are frequent. The distal aperture is thus also often broken. The organ 

 may be torn downward in front (or shorter side) leaving a longer 

 strip in back; the longer part may then extend forward like a hood 

 and be pulled laterally to resemble a flat plate (see Benham, 1916, pi. 

 47, fig. 24). It is possible that such an imperfect organ led Benham to 

 say: "These papillae have a subterminal oval disc at one side of the 

 apex, which appears sucker-like in that it slightly hollowed out." Further- 

 more, the same author stated that "the apex of the papilla carries a few 

 stiff sensory hairs." The socalled "hairs" may have been optical aber- 

 rations, representing prolonged shadows made by the crenulations that 

 mark the inner side of the aperture (fig. 11). Such shadows can be 

 prolonged or curved at will, depending on the power and source of 

 illumination. 



A specimen reported as G. nana Treadwell (1914, p. 197) off San 

 Clemente Island, California, 136 to 500 fms on green mud, has been 

 reexamined and is here referred to G. tesselata Grube; it is now de- 

 posited in the Allan Hancock Foundation. G. abranchiata Treadwell 

 (1901, p. 200) from Puerto Rico, has been referred to this species 

 (Augener, 1922b, p. 205). 



The type specimen of Glycera spadix Treadwell (1943, p. 3) from 

 the Gulf of Davao, Philippine Islands, catalogue no. 3241 in the 

 American Museum of Natural History, has been examined and is here 

 referred to G. tesselata Grube. The jaws consist of 4 dark sets with 

 characteristic ailerons; each consists of 2 long, widely divergent fangs. 

 The proboscidial organs are tall and slender, filiform, and completely 

 cover the proboscidial surface. Parapodia are biramous, with simple 

 notosetae and composite spinigerous neurosetae. The prostomium has 

 more than 10 rings (there may be 12 to 14, as is the case in G. tesselata 

 Grube) but the precise number is difficult to make out because the speci- 

 men has the anterior end somewhat withdrawn into the first few body 

 segments. 



Distribution. — G. tesselata Grube was originally described from the 

 Mediterranean Sea; it is widely known from the West Indies, Carib- 

 bean Sea, tropical Pacific, and warmer waters of western America, 

 north to British Columbia, Canada. It is recorded from sublittoral 

 depths to 310 fms. 



