NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 137 



long, slender in anteriormost segments, to shorter, broader, transform- 

 ing more or less gradually to the simple, robust hooks present in posterior 

 segments. The same applies to the simple, hooded hooks in anterior seg- 

 ments, when present. 



The development of presetal and postsetal lobes of parapodia, par- 

 ticularly as one proceeds from anterior to posterior regions, provides a 

 more stable character, especially when correlated with other parts, but 

 this requires that specimens be nearly complete for certain identification 

 — a condition all too infrequent in many collections. In some species 

 where it has been possible to test the specificity of this character, it is 

 found that the proportionate lengths of the lobes may be one of 3 types : 

 (1) they may remain more or less constant throughout, (2) there may 

 be a gradual elongation of only the postsetal lobe, or (3) there may be a 

 gradual lengthening of both presetal and postsetal lobes in some segments. 



An attempt is herein made to provide a more accurate means for 

 ready identification of species from the eastern Pacific and Western 

 Hemisphere. For this purpose, 3 groups (A to C) are here recognized. 

 These are as follows : 



Group A includes those in which the anterior parapodia are provided 

 with only simple limbate setae, or also simple hooded hooks. 



Group B includes those in which anterior parapodia are provided 

 with simple limbate setae and composite hooded hooks. 



Group C includes those in which anterior parapodia are provided 

 with composite setae in addition to composite hooded hooks and simple 

 limbate setae. 



Another species, L. janeirensis Augener (1934, pp. 138-139, fig. 28), 

 is said to have only simple limbate setae; I have seen no representatives 

 of this. 



The genus Lmnbrineris Blainville is known through about 110 to 

 125 species; many of these are very poorly known and their affinities re- 

 main obscure or questionable. The records for the Western Hemisphere 

 are likewise numerous (55, below). These include the following (anno- 

 tations are given for some not discussed in the body of this report) : 



1. L. abyssormn Mcintosh (1885, p. 250) trawled off Valparaiso, 

 Chile, in 2,225 fms. (Setae and hooks were lost; hence this is in- 

 completely known.) 



2. L. acicularum Webster and Benedict (1887, p. 724) from New 

 England. (The description is incomplete; the type specimen in the 

 U. S. National Museum collections lacks prostomium and probos- 

 cidial parts.) 



