156 U.S. NATIONAL MUSEUM BULLETIN 2 27 



43a) suboval, with short bulbous palps and slender pointed antennae, 

 slightly longer than the palps. With 4 rather large eyes. With a 

 pair of ciliated nuchal organs posterior to the eyes and which may 

 be pigmented. Tentacular segment slightly longer than the following, 

 with a more or less conspicuous middorsal anterior extension. Ten- 

 tacular cirri with long cirrophores, with long slender styles, the 

 longest extending to setigers 6-20. 



Parapodia with notosetae between two notopodial ligules, a neuro- 

 podial setigerous lobe with upper and lower groups of neurosetae, 

 a lower neuropodial ligule. Dorsal cutI longer than the ligules; 

 ventral cu-ri about as long as the neuropodial ligule. In the anterior 

 region, the parapodia (fig. 436) are formed of 4 short, rounded, 

 closely appressed lobes. The notosetae are homogomph spinigers. 

 The upper group of neurosetae are homogomph spinigers and hetero- 

 gomph falcigers with short appendages, the lower group of neurosetae 

 are heterogomph spinigers and falcigers. In the middle and posterior 

 regions, the parapodia (fig. 43c) are formed of 4 conical lobes, more 

 elongate and tapering than in the anterior segments, the lobes rather 

 widely separated, each with 2 large, more or less conspicuous dark- 

 colored glands at the bases of the dorsal cirri. Beginning on about 

 setiger 20, some of the lower notosetae are replaced by a few (1-4) 

 homogomph falcigers with a recurved tip (fig. 4od). The neurosetae 

 are similar to those of the anterior segments except that the hetero- 

 gomph falcigers have short blades with a recurved tip (fig. 43e). The 

 acicula are black. Anal cirri 2, about as long as the tentacular cu'ri. 

 Proboscis (fig. 43,/,^) with pale amber-colored jaws, each with 

 5-13 teeth, with paragnaths in the form of very small, fine, pectinate 

 denticles (may be very pale and difiicult to detect). Denticles absent 

 from areas i, ii, and v; group iii, small transverse mass of 3 groups, 

 each with 1, 2, or 3 rows; group iv, several parallel pectinate rows 

 (3-5 rows); group vi, 2-3 cmwed rows; groups vii-viii, 5-7 masses 

 of 1-2 rows each (in small specimens, may be difficult to see separate 

 rows; in heteronereids, may form a fused mass). 



Color in life: iridescent, bright olive green tinged with orange-red 

 "frecldes" or dots; yellow with greenish spots and whitish splotches 

 (specimens on gulfweed) ; young translucent, nearly white with seme 

 red specks on surface; color variable, greenish, yellowish, pink, reddish 

 with violet chromatophores, the pigment may be uniformly spotted 

 or somewhat banded (Fauvel). Color, preserved: may show dorsally 

 dark bands of dots and darker spots at the bases of the parapodia, 

 2 spots basal to the dorsal cu'ri, in the tips of the ligules, on the bases 

 of the ventral cirri and scattered spots veutraUy. 



Both male and female heteronereids show marked changes from the 

 atokous form in that the eyes become greatly enlarged; the antennae 



