NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 55 



The tube is coarse, tapers basally to an embedded, parchmentlike end, 

 and widens distally to a coarsely covered, lateral vent. For a short dis- 

 tance, where it projects above the substratum, and a little below, it is 

 externally covered with coarse algal particles, fine sticks, and shell frag- 

 ments, placed more or less transversely on the parchment base; hence the 

 tube looks ragged and untidy. 



Specimens from Caledonia Bay, Panama, are much smaller than those 

 from North Carolina, though egg-laden, presumably adults. In other 

 respects, however, they agree favorably. 



Distribution. — D. cuprea has been widely reported from Massachus- 

 etts south to Brazil; it is littoral and occurs most abundantly in muddy 

 sand flats, especially at low-tide level and slightly below. 



Diopatra ornata Moore 

 Plate 1, Figs. 15-20 



Moore, 1911, pp. 273-277, pi. 18, figs. 77-85; Berkeley, 1927, p. 408; 



1939, pp. 338-339; Monro, 1933, pp. 73-74. 

 fD. dentata Monro, 1933, pp. 73-76, fig. 31. 



Collections.— 2^Z-?,A (1); 491-36 (3); 893-38 (2); 897-38 (1); 

 910-39 (1); 1003-39 (1); 1024-39 (1); 1130-40 (1); 1165-40 (about 

 6); 1204-40 (1); 1205-40 (1). 



The occipital tentacles are short and reach back to about the fourth 

 setiger. Ceratophores have about 6 equally long rings, or the first and 

 last rings are a little longer than the others. Tentacular styles are cov- 

 ered over with close, irregular, longitudinal rows of papillae, all of about 

 the same size, which number 40 to 60 around the style, near the base. The 

 papillae are close, crowded, hence contrast with the corresponding condi- 

 tion in D. cuprea (see above), where they are in alternating rows. 



The first few parapodia are much like those in D. cuprea, but the 

 presetal part of the lobe is distally more truncate, and each of the three 

 prolongations has a dark spot near the base (pi. 1, fig. 17). 



Branchiae are first present from the fifth (or fourth) setiger, and 

 continued through a long region of about 80 segments. The second (to 

 third or fourth) pairs are the largest. Their filaments are spiraled 

 through 58 to 60 segments, then weakly pinnate for about 10 segments, 

 and the last 10 or more are simple filaments. The branchial stem is 

 weakly annulate in anterior segments. 



Ventral cirri of the first 4 or 5 setigers are cirriform, others are pad- 

 like. In the first 5 setigers the dorsal cirri are larger and longer than the 

 others, but thereafter they are equally long, though slenderer. The first 



