TYPES OF POLYCHAETE WORMS HARTMAN 115 



Genus EUPHIONE Mcintosh 



EUPHIONE CHITONIFORMIS (Moore) 



Lepidonotus chitomformis Mooee, 1903, p. 405 (U.S.N.M. no. 15646; Japan). 

 "iLepidonotus branchiferus Mooke, 1903, p. 409 (U.S.N.M. no. 15721; Japan). 

 (See Seidler, 1924, p. 108). 



Lepidonotus chitoniformis Moore has been transferred correctly to 

 the genus Euphione by Seidler (1922, 1924), Seidler, furthermore, 

 considered L. hranchiferus identical with L. chitoniformis. The type 

 specimens, however, differ from one another in the character of the 

 major spines on the elytra. In E. chitonlforinis these spines are 

 nodular, the 6 to 15 blunt nodes produced about the tip of a club- 

 shaped stalk in w^hich the stein is generally smooth. In E. hranchi- 

 ferus the major spines are closely covered with sharp-pointed stellate 

 spinelets, which are continued on the stalk and on the terminal knob. 

 Both types were collected from almost the same depth (49-63 and 

 34r-41 fathoms, respectively) from Sagami Bay. 



Genus ARCTONOE Chamberlin, char, emend. 



Arctonoe Chamberlin, 1920, p. 6B. 



Includes Halosijdnoides Seidler, 1924; EaJosydna Kineerg (pars); Polynoe 

 (pars) ; Lepidonotus (pars) ; Acholoe (pars). 



Body depressed, moderately long, consisting of a varying number 

 of segments, ranging from 39 [?] to 60 or more. Elytra 18 pairs or 

 more, continued to end of body but often leaving a broad dorsal area 

 exposed, inserted as in Halosycbia Kinberg on the first 26 segments, 

 insertion more or less irregular more posteriorly. Last few pairs of 

 scales usually small, delicate. Prostomium much as in Halosydna^ 

 except that the eyes may be reduced or absent and the lateral paired 

 antennae inserted somewhat ventrolaterally. 



Parapodia unequally biramous, the smaller notopodium provided 

 with an aciculum and few or no setae; notopodial setae straight, 

 slightly pectinated or quite smooth, distal end blunt, indiscretely bifid. 

 Neuropodia often robust, though short, truncate, each provided with 

 a heavy aciculum and few to many stout, falcate setae, lacking 

 pectinae or with faint transverse rows of teeth. Falcate setae are 

 sometimes accompanied by a few superior neurosetae resembling those 

 of the notopodium. Ventral cirri present on at least the first two 

 segments, those of the first resembling the dorsal cirri, with a sub- 

 terminal knob, those of the second cirriform. Ventral cirri of other 

 segments moderate to inconspicuous or absent. Dorsal cirri more or 

 less similar throughout. 



Elytra soft, translucent, with few or no spines or nodules, lateral 

 margins smooth to greatly frilled, lacking noticeable cilia or hairs. 



87105—38 2 



