NO. 1 hartman: goniadidae, glyceridae, nephtyidae 9 



The proboscidial organs are arranged in groups of 18 longitudinal 

 bands that are separated by shallow furrows. The bands correspond in 

 distribution to the terminal papillae and the 18 longitudinal muscular 

 bands of the proboscis; the furrows follow the directions of 18 large 

 longitudinal nerves (textfig. 3). The organs may be almost uniformly 

 distributed over the proboscidial length, or they may diminish toward 

 the basal or paragnathal ends, or they may be more or less restricted 

 to dorsal or ventral sides of the proboscis. When they consist of 

 heterogeneous pieces, as in Glycinde (plate 6) they are arranged in 

 trim series and present a striking pattern that grossly resembles the 

 radula of a gastropod. 



During the course of this investigation it has been found, for all 

 species of GLYCEREA investigated, that these organs (except for the 

 chevrons and one lateral, possibly homologous series in Glycinde) have 

 a larger terminal or subterminal pore (on the abgnathal side) that leads 

 through a canal to one or a few large cells within the organ. In some 

 species these processes resemble sucking disks (plate 4) ; in others they 

 may be likened to grapnels (plate 6). In all instances where examined, 

 the organs are specific and more or less uniform throughout the pro- 

 boscidial length. The pore and central canal of the individual organ 

 have been observed by some investigators, but the 3-dimensional relations 

 have remained obscure or unknown. 



Thus, Benham (1932, p. 555) described, for Goniada maorica 

 (below) "pharyngeal papillae . . a minute pore lies nearly halfway 

 down one side . . The pore leads into an axial canal of much greater 

 diameter," and again, for Goniada grahami Benham (1932, p. 561), 

 "papillae with pore and a groove;" also, Monro (1937, pp. 284-285) 

 described for Goniada eximia "papillae on the proboscis . . kidney- 

 shaped with a central canal;" for Goniada llongicirrata "papillae of the 

 proboscis are roughly triangular in outline, and have a passage running 

 up from the exterior (sic) to the central canal;" and for Goniada 

 multidentata indica Monro ( 1937, p. 284) the papilla from the pro- 

 boscis is "cordiform with a central canal." 



Casual microscopic examination of the proboscidial organs leads 

 almost invariably to erroneous interpretations, largely because of im- 

 perfect, damaged structures and distorted optical views. Since these 

 organs are minute, 3-dimensional objects, sometimes with striking 

 bisymmetry, arranged on a membrane that is cylindrical, they are 

 seldom seen in identical views on slide preparations. Unless they are 

 removed from the proboscidial tissue with care, they are distinguished 



