AGALMA ELEGANS. 281 



enclosed. The study of the development of these organs is much facilitated by 

 the fact that there is apparently no exception to the rule that they are formed 

 exclusively near the base of the tentacle, and that the most distal ones are the 

 oldest. The finer structure of the tentilla resembles that in other Agalmidae 

 and has been described by Haeckel. 



These facts show that the division of the "Siboga" specimens into two 

 groups was an unnecessary one. But it is not clear whether or not the tentilla 

 of the small type correspond to the kidney-shaped tentilla developed in some 

 other Agalmidae in conjunction with the primary siphon. The fact that these 

 tentilla may occur in connection with as many as four siphons argues against 

 such a homology (Lens and Van Riemsdijk, :08). But the question can be set- 

 tled only when better material of the young stages has been studied. Apparently 

 the small tentilla (which are after all essentially similar to the larger ones), 

 are developed in connection with a variable number of the earlier formed siphons. 

 Their absence from all of our large specimens means merely that the oldest 

 siphons have been broken off. The large number of detached but otherwise 

 normal cormidia in the "Siboga" and in the "Albatross" collections shows 

 that fragmentation does take place easily, perhaps even normally. And the 

 absence of loose cormidia with the young type of tentilla would easily be explained 

 on the supposition that they were detached while still very small. 



Color. In life the pigment spots of the pneumatophore are reddish purple, 

 the stem is opaque white or yellow, the tentilla brilliant brick-red. 



Distribution. Enough records of A. okeni have been made to show that it 

 is very generally distributed over the warmer regions of all three great oceans, 

 and that it occurs in the Red Sea (Schneider, '98, p. 120). 



Agalma elegans (Sars) Fewkbs. 

 Plate IS, fig. 9-13; Plate 19, fig. 1-4. 



Agalmopsis elegans Sars, '46, p. 32, tab. 5, 6 (partim). 



Agalmopsis sarsii Kolliker, '53, p. 10, taf. 3; Leuckart, '54, p. 331, taf. 12, fig. 21-27, taf. 13, fig. 1; 



Haeckel, '88b, p. 234; Bedot, '96, p. 409. 

 Agaima puuclata Leuckart, '53, p. 3, taf. 1, fig. 1, 19, 20, taf. 2, fig. 1, 2, 5-7, 23; (non Koli.iker, '53; 



non VoGT, '54). 

 Agaima davala Leuckart, '53, p. 3, tab. 2, fig. 3; '54, p. .337, tab. 13, fig. 2-12. 

 Agalmopsis clavalum L. Agassiz, '62, p. 369. 

 Agaima elegans Fewkes, '80a, p. 141; '80b, p. 618, fig. 1 ; '81, p. 163, pi. 9, 10; '82b, p. 301 ; Schneider, 



'98, p. 122; Romer, :02, p. 178. 

 C uneolaria elegans Haeckel, '88a, p. 40. 

 Agalmopsis catena Haeckel, '88b, p. 234. 

 Agalmopsis elegans Haeckel, 'S8b, p. 234; Chun, '97b, p. 104; Schneider, '98, p. 122; Romer, :02, 



p. 178; Vanhoffen, :06, p. 24, fig. 31-36. 

 "iCupulita sarsi Damas, :09, p. 107. 



