NO. 2267. 



NEW BRANCinOBDIJLLlD WORMS— -ELLIIS. 



255- 



Fig. 12.— Upper jaw, anter- 

 ior FACE VIEW, OF TYPE- 

 SPECIMEN OF PTER0DRILU3 

 DURBINI ELUS, FROM ANDER- 

 SON, INDIANA. TYPE IX. 



ment VII (sometimes segment VI) the wide segment of the body; 

 at least 10 body segments visible in side view ; major and minor an- 

 nulations of segment I of about the same diameter, the major annula- 

 tion, however, being about twice the length of the minor annulation; 

 major anmilations of segments II, III, and IV conspicuously elevated 

 laterally and dorsall^^, forming rutflelike bands around the anterior 

 halves of each of these three segments ; minor annulation of segment 

 V almost obliterated, major annulation of segment V elevated dor- 

 sally and laterally into a midsegmental crest 

 Mdiich almo.st encircles the segment; major 

 annulation of segment VI low, the minor an- 

 nulation elevated into an encircling segmental 

 crest; major annulation in segment VII ele- 

 vated and expanded into a funnel-shaped 

 collar which encircles the segment and stands 

 free from it except at the junction of the seg- 

 ment proper and the collar, the bell of the 

 funnel being directed cephalad; minor annula- 

 tion of segment VII low; major annulation 

 of segment VIII elevated and expanded into a funnel-shaped collar 

 like that on segment VII, except that the funnel of segment VIII is 

 directed posteriorly, its bell opening caudad and standing free above 

 the low minor annulation of segment VIII ; dorsal margin of the 

 funnel-shaped collar of segment VIII excavated in the mid-dorsal 

 line, so that the margin of the funnel shows two distinct " horns " 

 when seen from front or rear; segments IX and X low, small, and 

 i-ogular; head not exceeding the first two body segments in length, 

 divided into three rather equal thirds by two in- 

 distinct grooves; lips two, the upper the longer, 

 both slightly emarginate in the median line; oral 

 bristles present; dental formula 5-4; upper jaw 

 type IX, lower jaw type X; major pharyngeal 

 diverticula two, one dorsal and one ventral; ali- 

 mentary canal straight, maxinium enlargement in 

 segment IV; testes in segments V and VI; vasa 

 deferentia from segments V and VI meeting in 

 segment VI ; no accessory sperm tube ; sper- 

 matheca simple and tubular; caudal sucker large, termino-ventral ; 

 its diameter equalling or exceeding the greatest diameter of the head ; 

 largest specimen examined 2.0 mm. in length. 



For Mv. D. H. Durbin, whose interest in this work made pos- 

 sible a large number of collections in the White River drainage. 



Genus CAMBARINCOLA Ellis, 1912. 



Cambarincola Ellis, Proc. U. S. Nat. Mus., vol. 42, p. 481, 1912. 



Five species have been referred to this genus. Two of these species, 



Fig. 13.— Lower jaw of 

 type-specimen of pter- 

 odrilus durbini ellis, 



from ANDERSON, INDI- 

 ANA. TYPE X. 



