286 STEPHANOMIA BIJUGA. 



truncate, or slightly pointed. (Claus, '78, taf. 2, figs. 2, 3). The peculiar 

 arrangement of the palpons which, as has long been known, alternate with the 

 siphons, has been described by Chun ('88, '97a) and I am able to confirm his 

 statement that of the 4-6 palpons between every two siphons the ones nearest 

 the proximal siphon are the youngest, and that they are progressively older 

 and older as we approach the distal siphon, in other words, new members are 

 formed next the proximal siphon. This condition can be followed on the photo- 

 graph (Plate 19, fig. 9), though of course less readily than on a more diagram- 

 matic drawing (for further details as to arrangement of palpons and bracts see 

 Chun, '88, p. 1168). The close agreement in this respect between Atlantic and 

 Pacific specimens is one of the strongest reasons for uniting them in one species, 

 since in the closely related S. rubra the palpons are irregularly arranged along 

 the internodes. Female and male gonodendra are attached in pairs to the 

 bases of the palpons (Plate 20, fig. 2). 



The siphons, which are of the usual type, are borne on rather long pedicles, 

 and from these pedicles bracts are developed (Plate 20, fig. 1). 



Tentilla. These have often been described, especially by Fewkes. One 

 of the present specimens still has the primary tentacle with its characteristic 

 primitive tentilla (Plate 20, fig. 3), resembling those described by Agassiz ('65), 

 by Claus ('78), and by Fewkes ('88a). The definitive tentilla which are borne 

 on all the later formed tentacles develop through a series of changes similar to 

 those described above (p. 280) for Agalma okeni. Since young stages have been 

 figured by Claus, only the adult condition is represented here. The stage figured 

 by Delle Chiaje ('42, pi. 181) almost exactly duplicates one studied by Claus, 

 ('78, pi. 2, fig. 6). 



Color. The "Albatross" specimens were colorless except for the brilliant 

 red tenillae and the brownish red pneumatophore, but in this species pigment 

 flecks often occur at the bases of the palpons and on the stem. 



The various records of the capture of Stephanomia bijuga listed in the 

 synonymy show that it is very widely distributed in warm waters, being known 

 both from the West Indies (Fewkes, '82a), from the Mediterranean, and from 

 various localities in the Tropical Pacific, and from Amboina (Bedot, '96). Should 

 it finally prove to be identical with S. cara it would afford an instance of eury- 

 thermal distribution, from the tropics to the polar sea. But for the present 

 we can not claim such a range for it. 



