NO. 3 HARTMAN : POLYCHAETOUS ANNELIDS 315 



tacle and a pair of large eyes. Branchiae are present from segments 2 to 

 27. These statements suggest a representative of the spionids, possibly of 

 the genus Laonice Malmgren, from which the large, paired palpi had 

 fallen away. The conspicuous, interramal pouches, characteristic of 

 Laonice, were not mentioned, but perhaps were overlooked. The presence 

 of branchiae from the second segment, the 2 large eyes and occipital 

 tentacle, the large foliaceous lobes of parapodia, and the distribution of 

 setae and hooks are typical of representatives of the Spionidae. 



Two other species have been described recently from the Asiatic north 

 Pacific: they are Aricidea rarnosa and A. antennata, both by Annenkova 

 (1934, pp. 657-658). A. ramosa is unique in having a prostomial antenna 

 that is 5-lobed. A. antennata has lobed parapodial structures in anterior 

 segments, recalling those of the Orbiniidae. Setal structures were not 

 defined. They are therefore not incorporated in the key below. 



Key to Species of Aricidea from the Western Hemisphere 



1. Notopodia and neuropodia provided with only simple, pointed 

 setae throughout 2 



1. Posterior neuropodia provided with heavy simple hooks. A. 

 sp., Berkeley 



2. With long, postsetal, neuropodial lobe in branchial region (pi. 27, 

 fig. 5) A. fragilis 



2. Without long, postsetal, neuropodial lobes 3 



3. Branchiae number about 60 pairs A. pacifica 



3. Branchiae number only 13 to 20 pairs A.nolani 



The collections of the Allan Hancock Foundation include individuals 

 of A. fragilis Webster and A. pacifica, new species. 



Aricidea fragilis Webster 

 Plate 27, Figs. 4, 5 



Webster, 1879, pp. 255-257, pi. 9, figs. 127-132. 



?A. quadrilobata Webster and Benedict, 1887, pp. 739-740, pi. 7, figs. 

 93-96. 



Collections. — Beaufort, North Carolina (many). 



Mature individuals measure 40 mm or longer, have 50 to 60 pairs of 

 branchiae, first present from the fourth setiger. Branchiae increase in 

 size, going back, are thick, tapering, cirriform in shape and bordered with 

 fine cilia, but the tip is smooth. Dorsal cirri have a low protuberance on 

 their ventral side near the base (pi. 27, fig. 5) but are long, cirriform 



