NO. 2267. 



NEW BRANCHIOBDELLID WORMS— ELLIS. 



263 



various localities were found in the collections, killed with these 

 tentacles fully extended. Most of the preserved specimens ex- 

 amined showed these tentacles, the lobes of the lips being extended 

 beyond the level of the lips so that the tentacles, although small, 

 were distinct. It was also found that worms of this species could 

 flatten the entire lip, so that the lobes were scarcely visible. Pre- 

 served specimens which had been killed with the lips in this flat- 

 tened condition were separated often with 

 difficulty from individuals of the first 

 group of species of this genus, but close 

 examination in nearly every case showed 

 the regular emarginations marking the 

 location of lobes of lips. The lobes were 

 easily seen in a yovmg worm less than 

 three hours old which was examined in 

 water. This worm extended and con- 

 tracted the lobes in the same manner as an adult. 

 philadelphica was the most variable species studied. 



CAMBARINCOLA CHIROCEPHALA. new species. 



Fig. 18.— Upper jaw of type-spec- 

 imen OF CAMBARINCOLA COIRO- 

 CEPEALA ELLIS, FROM ROLLA, 

 MISSOURI. TYPE VII. 



Camharincola 



phica (Leidy) 



Type.—Q^t. No. 17713, U.S.N.M., body length 2 mm., Kolla, Mis- 

 souri (J. Barley), on Camharus vinl'is Hagen (det. Faxon). 



Paratijpes. — One, Cat. No. 17713, U.S.N.M., and three others, col- 

 lected with the type. 



Description. — General body form that of Camharincola philadel- 

 body segments evident, major annulations of seg- 

 ments especially in contracted specimens, distinctly 

 and visibly elevated above the minor annulations; 

 body segments increasing regularly and gradually in 

 diameter from segment I to segment VI or VII, and 

 decreasing slightly from segment VIII to the caudal 

 sucker; body terete; head large, equalling the first 

 two body segments in length and exceeding the first 

 segment in width ; lips two, upper composed of four 

 subequal lobes which may be extended into four 

 distinct digitiform tentacles, or may be so flattened as to give the 

 lip an almost entire outline ; lower lips of two larger, subequal lobes 

 which are usually somewhat extended; a very small intermediate 

 lobe at the junction of the upper and lower lip on each side of the 

 mouth; major pharyngeal diverticula two, a dorsal and a ventral, 

 the dorsal diverticulum being slightly cephalad of the ventral ; dental 

 formula 5-4; upper jaw very large, its width two or three times 

 that of the lower jaw, teeth of the " c " and " h " orders on each side 

 very small, less than one-sixth the height of tooth "J," the jaw 



Fig. 19.— L o w e r 

 jaw of type-speci- 

 men of cambarin- 

 cola chirocepha- 

 la ellis, from 

 rolla, missouri. 



TYPE VIU. 



