72 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.15 



Distribution. — G. tenuis is known from central California (Hart- 

 man, 1944c, p. 254), southern California and Coos Bay, Oregon; it 

 occurs in intertidal to shallow depths. 



Glycera convoluta Keferstein 

 Plate 10, figs. 5, 6 



G. longipinnis Treadwell, 1914, p. 198. Not Grube, 1878b. 

 Hartman, 1940, p. 247. 



Collections.— 617-37 (1); 1441-41 (1); 1450-42 (2); 1451-42 

 (1); 1457-42 (1); 1505-43 (3); Mission Bay, California (1); En- 

 senada, Lower California, collected by E. F. Ricketts (1); Todos 

 Santos, Lower California, collected by Thomas Burch (4) ; Monterey 

 Bay, California, in 73 meters, collected by A. E. Galigher ( 1 ) . 



The proboscidial organs are of 2 kinds. The more numerous ones 

 have a capelike sheath (figs. 5, 6) ; the others are larger and approxi- 

 mately oval in shape. The first are many more times as abundant as 

 the second, but both are irregularly strewn, so as to cover the surface of 

 the proboscis closely. 



The sheathed organs have a unique structure that has been obscurely 

 described and variously interpreted. Thus: "kurze kegelformige Fort- 

 satzte, welche mit der abgestutzten Kegelspitze auf der Riisselwand 

 sitzen, und deren schrag abgeschnittene Basis am Rande verdickte spitz 

 eiformig Chitinplatte tragt" (Ehlers, 1868, p. 665) ; ". . schrage End- 

 flache versehenen Riisselpapillen" (Arwidsson, 1899, p. 19) ; ". . 

 pediculated oval papillae bearing inclined, winged, cuticular terminal 

 plates" (Moore, 1911, p. 301); ". . Papillen . . schrag abgestiitzte 

 Endplatte . . . die bei Profillage in Kantenstellung erscheint" (Augener, 

 1918, p. 387) ; ". . cylindrical unguiculate papillae obliquely truncated 

 with a kind of transparent chitinous nail at the tip" (Fauvel, 1932a, p. 

 126) ; ". . papillae with terminal oblique, truncate plate" (Okuda, 

 1938, p. 94) ; ". . papillae with cylindrical stems with oblique mamillate 

 ends bounded by the flat wings" (Okuda, 1940, p. 16). 



Most of these descriptions, as also others that might be cited, sug- 

 gest a structure that is nailheaded or that has a terminal plate, such as 

 is suggested by a nail. None mentions the presence of a terminal pore. 

 Lack of uniformity in the various descriptions, based supposedly on 

 the same species, suggests that these proboscidial organs, when observed, 

 are either imperfect or not similarly oriented, both of which are very 

 likely. 



