136 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



p. 34) appears to be an Iphitime Marenzeller (1902, p. 578). Eranno 

 Kinberg is a Lumbrineris (see p. 138). Labidognathus Caullery (1914, 

 p. 490) is an Arabellidae (p. 180). Unciniseta Bidenkap goes to Lum- 

 brineris (Arwidsson, 1908, p. 267). 



Genus LUMBRINERIS Blainville 



(Includes Lumbriconereis Grube, Lumbrinereis delle Chiaje, Unciniseta 



Bidenkap, Eranno Kinberg.) 



Type L. fragills (O. F. Miiller) 



Although clearly distinguishable from other related genera, Lumbri- 

 neris includes an enormous number of species which are sometimes identi- 

 fiable with difficulty or not at all from others through their known de- 

 scriptions, since there appear to be comparatively few external characters 

 which have real specific value. Representatives of this genus have usually 

 a plain, unadorned exterior, and are often to be distinguished only 

 through dissection and examination of microscopic parts. The shape of 

 the prostomium is variable to a degree, and such expressions as sharply 

 conical, rounded, globular, etc., have only approximate value. The 

 proboscidial formula has often been given in specific descriptions; but, 

 since the major maxillary plate II is reasonably constant within the 

 genus, or specifically variable to some extent, this is also of little value 

 in some species, unless substantiated by numerous other characters; the 

 usual number of teeth on this plate ranges from 4 to 6, but is often 4 or 

 5. However, the basal attachment of maxilla II to the base of the forceps 

 appears to be reasonably characteristic. Maxillary plates III and IV 

 are often unidentate, or III may have 2 teeth; rarely (L. inflata Moore) 

 both III and IV have more teeth. The maxillary carriers vary too widely 

 within a species to be of great value. The form of mandibles may be 

 more specific, especially the degree of fusion of the basal ends; its cres- 

 centic muscle scars are often conspicuous on the ventral side. 



Limbate setae are almost uniform in shape except in a few abyssal 

 forms where they are greatly prolonged and very slender. The simple 

 hooded hooks in median and posterior regions vary from superior to in- 

 ferior positions of the fascicle, but are also too constant to be of practical 

 specific value. The usual condition is for a minutely dentate distal end 

 with a larger basal tooth. 



Presence or absence of composite hooks (or also setae) in an anterior 

 region clearly divides the genus into several major groups (p. 141), but 

 the appendages of these hooks vary in shape in a single individual from 



