482 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 4£ 



sixth segment, shortest diameter in the first segment, sloping grad- 

 ually from the fifth segment to the first and rather abruptly from the 

 sixth segment to the acetabulum; greatest diameter of the head always 

 less than the greatest diameter of the body; greatest diameter of the 



Fig. 2.— Cambarincola macro- 

 DONTA. Dorsal dental 



PLATE, FRONT VIEW. FROM A 

 CLEARED PREPARATION. 



Fig. 1.— Cambarincola macrodonta. Outline side view of type-specimen. 



body 5 to 8 in the body length; head distinct, elongate in extended 

 specimens; length of the head greater than the greatest diameter of 

 the body in extended specimens (greatest diameter of the body 1.1 to 

 1.3 in the length of the head), equal to or less 

 than the greatest diameter of the body in con- 

 tracted individuals (length of the head 1 to 1.3 

 in the greatest diameter of the body) ; greatest 

 diameter of the head 1.2 to 1.4 in the greatest 

 diameter of the body. 



Head composed of four annulations; the first 

 or anterior cephalic annulation very prominent, 

 of less diameter than the second annulation, 

 tapering forward, from 2.3 to 3.3 in the total 

 length of the head, depending upon the degree of contraction, composed 

 largely of two fleshy lips — a dorsal and a ventral — of which the dorsal is 

 very slightly the longer; the other three annulations very indistinctly 

 marked, so that the remainder of the head appears 

 to be but a single piece ; first seven or eight body seg- 

 ments showing a rather distinct biannulation, the 

 anterior portion of each segment being of the greater 

 diameter; acetabulum terminal, of moderate size, 

 from 1 to 1.25 in the greatest diameter of the head; 

 genital papillae on segments 5 and 6, quite conspicu- 

 ous in large specimens. 



Mouth terminal, or very slightly ventral, its open- 

 ing rather diamond shaped, with the greatest di- 

 mension at right angles to the dorso-ventral line, guarded by two 

 large lips, each of which bears several tiny papillae on its inner 

 surface and a few minute hairs on its outer edge near the median 

 line; each lip entire with the exception of a single slight emargina- 



FiG. 3.— Cambarincola 

 macrodonta. Ventral 

 dental plate, front 

 VIEW. From a cleared 



PREPARATION. 



