170 PROCEEDINGS OF THE NATIONAL MUSEUM vol.84 



colored, but otherwise there is a lack of pigmentation in the pre- 

 served specimens studied. Transversely elongate, median, ventral 

 papillae on 11/12, 12/13, and 14/15-16/17 are present in all the speci- 

 mens. Paired ventral papillae on 19/20 and 20/21 are present on 

 most of the specimens and are lacking on 20/21 in one of them. 



Dorsal pores are present posterior to the clitellum. Xephridio- 

 pores are very small and situated near the anterior margins of 

 somites, beginning with the second one. The number to the somite 

 is somewhat variable, commonly 7 or 8 on each side. There is one 

 pair of male pores on somite 18, laterad of the penial setae and very 

 close to them. Oviducal pores are paired on 14, slightly anterior 

 to the ventral setae, and mesad of seta line a. Spermathecal pores 

 are paired on 7/8 and 8/9 and in line with the setal pairs db of the 

 corresponding sides. 



Internal characters. — Septum 5/6 is not thickened; septa 6/7-10/11 

 are strongly thickened; 11/12 and 12/13 are less thickened and the 

 following ones not thickened. A well-defined buccal cavity and a 

 pharynx are present. The thickened dorsal wall of the pharynx is 

 connected with the body wall by numerous radiating muscular fibers. 

 A powerful gizzard is present in somite 5. The lumen of the esopha- 

 gus in 6-8, the anterior part of 9 is relatively small, and the lining 

 epithelium forms several longitudinal folds. In the posterior part 

 of 9 the lumen of the esophagus is much enlarged, and the epithelial 

 lining has numerous thin folds reaching nearly to the middle of the 

 lumen. In 10-15 similar and larger pouchlike evaginations with nu- 

 merous thin folds of the lining layer are formed. They are largest 

 laterally with the diameter of the esophagus about one-half as great 

 as that of the body. The appearance of transverse sections of these 

 enlargements is similar to that of the calciferous glands of Lumbri- 

 cidae and of some species of Diplocardia. There is a lack of longi- 

 tudinal chambers extending through consecutive somites and also 

 a lack of a secondary lumen produced by a fusion of the inner edges 

 of the folds. The diameter of the esophagus is much reduced wliere 

 it passes through the septa. In 16-18 the diameter is considerably 

 less than in 15, and there is but little development of folds. Pos- 

 terior to 18 the alimentary tract is much enlarged and becomes the 

 intestine and a definite typhlosole is present. The circulatory sys- 

 tem lacks subneutral and lateroneural vessels. A supra-esophageal 

 vessel is present in the region of the calciferous gland. Paired dor- 

 sal hearts are present in 7-9, and much larger dorso-esophageal 

 hearts are paired in 10-13. Micronephridia are present in 2 and 

 following somites, eight to ten on each side of somites 2— i and seven 

 or eisht on each side of other somites that were examined. 



