NO. 226'; 



NEW BRANCHIOBDELLID WORMS— ELLIS. 



'^59 



Fig. 16. — Upper jaw of 

 cambarincola inversa 

 elli.s, from eugene , 



OREGON. 



CAMBARINCOLA INVERSA, new species. 



Plato 11, fig. 3. 



Type.— Cat. No. 17680, U.S.N.M., body length 2 mm., Eugene, 

 Oregon (J. E. Giitberlet), on Astacus klamathemis Stimpson (det. 

 Faxon). 



Paratypes.—F'iYQ, Cat. No. 17680, U.S.N.M., and 15 others collected 

 with the type. 



Description. — Body rather elongate and more or less terete ; width 

 of the head approximately equal to that of segment I ; body segments 

 increasing in width regularly and gradually from 

 segment I to segment VI, which is the widest seg- 

 ment of the body; segments VII and VIII slightly 

 narrower than segment VI ; body posterior to seg- 

 ment VIII narrowing rapidly to the caudal 

 sucker; all 11 body segments visible in side view 

 and 9 or more visible in dorsal view; caudal 

 sucker termino-ventral, its diameter less than that 

 of the head; each segment, slightly constricted 

 anteriorly and posteriorly, so that the segmental junctions are dis- 

 tinct; head subcylindrical, its anterior third defined by a groove or 

 constriction; length of the head in moderately expanded specimens 

 slightly less than the length of the first two body segments; lip.^, 

 two, the upper slightly longer than the lower; the lower lip with a 

 distinct median emargination ; upper lip like the lower, but wdth two 

 small lobes in the base of the emargination; oral bristles present; 

 dental formula 3-4, varying 3-3 to 5-4 (see table) ; upper jaw' with 

 three large teeth, of Avhich the middle one is the longest, all three 

 directed forward — that is, away from the base of the 

 jaw; dental ridge of the upper jaw usually with a 

 small tubercle in the position of the teeth of the " c " 

 order — that is, if the jaw^ were five-toothed (teeth 

 were found on these tubercles in two specimens, the 

 tooth point in each case being very small); lower 

 jaw with tw^o large teeth and two small lateral teeth; 

 upper jaw" 20 micra wide, lower jaw 17 micra wide 

 in an expanded v\^orm measuring 3.G mm. ; major pharyngeal 

 diverticula two, one dorsal and one ventral; anterior nephridia 

 alternating in segments II and III, opening to the outside in 

 segment III through a common pore in the dorsal surface of the 

 major annulation of segment III; spermatheca simple, long, 

 and tubular, not bifid; testes present in segments V and VI, vasa 

 deferentia from segments V and VI meeting in the atrium in seg- 

 ment VI; alimentary canal straight, increasing in diameter in seg- 

 ment I, much expanded in segments II, III, and IV, in which 

 segments it forms an almost continuous pouch; intestine narrowing 



Fig. 17.— Lower jaw 

 of cambarincola 

 inversa ellis, 

 from eugene, ore- 

 GON. 



