140 CALIFORNIA ACADEMY OF SCIENCES. 
aumber, 2 and 2 opening close together in the prostate pore. Typhlosole. Nephridia large, 
meganephridia, not alternate, opening in front of sete 3 and 4. Color milky white, no 
pigment. Habitat, Tepic, Mexico, 4000 feet altitude. 
Acanthodrilus tamajusi n. sp. 
Figs. 87-96. 
Habitat. Of this species I possess one adult and half a dozen young speci- 
mens, principally from Tamaju on the rio Polochic in Guatemala. The largest in- 
dividual measures about 150 mm., but even this one did not have the elitellum per- 
fectly developed, but was otherwise seemingly mature. One of the smaller specimens 
measuring only 70 mm. in length possessed a more perfect clitellum than the larger 
specimen. These specimens were found by myself several years ago in June and 
July on top of the ground after rain. It is probably a common species in tropical 
Guatemala. On account of imperfect preservation of the specimens, some histological 
details are wanting. 
Color. Deep violet-brown and iridescent when alive. Skin pigmented strongly 
on the tail, slightly on anterior part, but only on the upper side in the two mature 
specimens. A large immature specimen possessed no pigment, and was of a grayish 
color, but there may be some doubt as to its belonging to this species. 
Size. Largest specimen 15 em. by about 1 em. in front of clitellum. The 
specimen had not been extended and killed before being placed in alcohol and must 
therefore have been considerably longer. 
Number of somites 218 about, those in front of clitellum much larger than 
those posterior to it. 
First dorsal pore in the pigmented specimens only posterior to clitellum. In 
the unpigmented between vil and xiii. 
Prostomium doubtful (injured), but appears to incompletely or not at all divide 
somite i. 
Clitellum complete, xiii to $xx. 
Penial setw. A sac with one penial seta at each prostate. This seta has 
numerous short rows of teeth, decreasing in number towards the apex. The seta is 
quite short, blunt at one end and broad, tapering gradually toward the apex which is 
slightly recurved. The whole seta is irregularly sickle-shaped. The teeth are on 
the concave side. One seta possessed four notches with short teeth also on the con- 
vex side posterior to the other, or about where the thickest part begins (figs. 93 A, B,C). 
Common sete strictly paired on ventral side of body. The distances between 
the couples about the same. The ventral couples of sete are present near to the 
spermiducal or male pores. They are the ordinary form but slightly larger than the 
common sete. 
Oviducal pores in xiy situated somewhat nearer the median line than to the 
inner couples of setee, and the distance between the pores is a trifle more than the 
distance between setxe 1 and 2 in the same somite. 
Prostate pores situated each on a small papilla. 
