52 
TRICHODRILUS PRAGENSIS Vejdovsky 
Length, 30-40 mm. Diameter, 0.6-0.7 mm. Somites, 60-80. Color, 
reddish white. Prostomium rounded, about twice as long as diameter 
at base. Clitellum indistinct. Spermiducal pores on 10, posterior to 
ventral setae. Oviducal pores in 11/12. Spermathecal pores: one pair 
on 11 between the oviducal pores and ventral setae; one pair on 12 in 
line with ventral setae. Setae simple-pointed, sigmoid, nodulated, two per 
bundle. Eight pairs of transverse vessels in anterior somites. Dorsal 
vessel with 4-6 asymmetrically arranged caecal diverticulae per somite, 
with forked tips. Nephridia in 8, 14, 22, etc., irregularly distributed, and 
extending into other somites. Spermiducal funnels paired in 9 and 10. 
Sperm ducts opening into a pair of atria in 10. Atria as in T. allobrogum. 
Spermathecae arranged as in 7. allobrogum, but the second pair dis- 
appears in sexually active worms. 
TRICHODRILUS SANGUINEUS (Bretscher) 
Length, 9-13 mm. Somites, 50-72. Differs from T. pragensis chiefly 
in having bifid setae. Spermathecae of 12 disappear in sexually active 
specimens as in J. pragensis. Lateral branches of dorsal vessel not 
described. 
LITERATURE CITED 
Bretscher, K. 
00. Stidschweizerische Oligocheeten. Rev. Suisse de Zool., 8 : 435— 
458, 1 pl. 
‘ Claparede, E. 
62. Recherches anatomiques sur Oligochetes. Mem. Soc. Phys. et 
Hist. Nat. Geneve, 16 : 217-291, 4 pl. 
Michaelsen, W. 
00. Oligochaeta. Das Tierreich, 10 Lief. XXIX + 575 pp., 13 
fig. Berlin. 
Piguet, E. 
13. Notes sur les Oligochetes. Rev. Suisse de Zool., 21 : 111-146, 
12 fig. 
Vejdovsky, F. 
76. Ueber Phreatothrix, eine neue Gattung der Limicolen. Zeit. 
wiss. Zool., 27 : 541-554, 1 pl. 
84. System und Morphologie der Oligochaeten. 166 pp., 16 pl. 
Prague. 
