DEVELOPMENT AND ANATOMY OF SOME EARTHWORMS. 30 
PLATE 5. 
Figs. 34—41. Mahbenus imperatrix; Fig. 42. Pericheta pel- 
lucida; Fig. 48. Acanthodrilus sp.; Fig. 44. Pericheta mirabilis. 
Figs 34 and 35. Enlarged views of some of the nephridia from the prepa- 
paration, Fig. 338. Letters as before. 
Figs. 36—39. Series of nephridia from an older embryo of Mahbenus. 
Jun. Funnel. NK. Neck region. 7. Glandular loop. Za. d. Excre- 
tory duct. w. 1, 2. 2, 2. 3. Micronephridia beginning to develop. 
Fig. 40. From a still older embryo. 2. x. Portion of the neck region of 
anephridium such as Fig. 39. a, 0, ¢, d, e, f. Micronephridia develop- 
ing from it. g. Micronephridium developing from a. Zz. d. Excretory 
duct. Hz. p. Excretory pore. s. m. Setal matrices. 7. m. Inter- 
matricial band. 
Fig. 41. A micronephridium from an adult Mahbenus. 
Fig. 42. A nephridium from one of the Segments vir—x1 of a full-sized 
embryo of P. pellucida. 
Fig. 43. A nephridium from an embryo of Acanthodrilus sp. B. W. 
Body-wall. Sepé. Septum. fuz. Funnel. a. Duct from funnel. From 
6 to d the exact course of the duct is shown. d passes downwards to 
the excretory pore. 
Fig. 44. A micronephridium from an adult Pericheta mirabilis. 
fun. Funnel (not preseptal). Av. d. Excretory duct. 
VoL. 36, PART 1.—NEW SER. Cc 
