P4 EISEN 



the dorsal interval. The setae are slightly sigmoid. An immature 

 specimen, found in the same vial and possibly belonging to the same 

 species, possessed an average of one more seta in each fascicle. 



Genus Bryodrilus Ude. 



Definition. — Setse sigmoid. Head-pore between prostomium and 

 somite I. No dorsal pores. Esophagus gradually emerging into the 

 intestine. Blood colorless. Dorsal vessel rises in the clitellum ; with 

 or without cardiac gland. Peptonephridia rudimental. Testes solid. 

 No sexual ventral glands. Spermathecse connected with the intestine. 

 Penial bulb without interior muscular strands. Intestine with four 

 diverticles in somite VIII. Nephridia with branched inner duct. 



Penial bulb. — The penial bulb in the present species of Bryodrilus 

 is built on the same principle as in Fridericia and Lumbricillus 

 though it is somewhat more complicated, as will be described more in 

 detail under the species. Here it is sufficient to point out that there 

 are two sets of glands, one opening into the sperm-duct, the other in 

 small depressions on the base of the bulb. 



Nephridia. — They are of the Enchytrceus type but the ducts are 

 more complicated, being much branched (at least in one species) . The 

 anteseptal consists of a mere nephrostome. 



SYNOPSIS OF SPECIES OF BRYODRILUS. 



Setae distinctly sigmoid, 3-5 in each fascicle. Brain posteriorly convex. 



I. B. ehlersilJde. 

 Setae indistinctly sigmoid, 2 in each fascicle. Brain posteriorly emarginate. 



2. B. udei sp. nov. 



BRYODRILUS UDEI sp. nov. 

 pi. XII, figs. 1-4; text-fig. 63. 

 Definition. — Length 25 mm., width 1.25 mm., somites 56, or 

 length 25 mm., width .75 mm., somites 75. Setas almost straight and 

 short ; in couples ; eight in each somite. Head-pore between somite I 

 and prostomium. Clitellum dorsally and ventrally XI, XII and XIII. 

 Copulatory papilla distinct, and rounded or truncate, with a longi- 

 tudinal slit at apex. Ovipores elevated. Septa not thickened. Septal 

 glands in IV to VI. Salivary glands ( .?) rudimentary. Brain slightly 

 longer than wide, emarginated both anteriorly and posteriorly. Dorsal 

 vessel originates in XII and is furnished with a cardiac gland. In- 

 testine with a thin layer of chloragogen cells. Four intestinal diverti- 

 cles in VIII connecting with the intestine at the posterior septum. 

 Spermathecas without diverticles, grown together at apex and opening 

 through a common duct into the intestine. Sperm-ducts very narrow, 



