140 CALIFORNIA ACADEMY OF SCIENCES. 



number, 2 and 2 opening close together in the prostate pore. Typhhsole. Nephridia large, 

 meganephridia, not alternate, opening in front of set re 3 and 4. Color milky vjhite, no 

 pigment. Habitat, Tejnc, Mexico, 4000 feet altitude. 



Acanthodrilus tamajusi ii. 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 Polocliic in Guatemala. The largest in- 

 dividual measures about 150 mm., but even this one did not have the clitellum per- 

 fectly developed, but was otherwise seemingly mature. One of the smaller specimens 

 measuring only 70 mm. in length po.ssessed 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. 8kin 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 cm. by about 1 cm. in front of clitellum. The 

 specimen had not been extended and killed before being placed in alcohol and must 

 therefore have been considerablj- 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. Tn 

 the unpigmented between vii and xiii. 



Prostomium doubtful (injured), but appears to incompletely or not at all divide 

 somite i. 



Clitellum complete, xiii to ^xx. 



Penial seta'. 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 atone 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 setre strictly paired on ventral side of body. The distances between 

 the couples about the same. The ventral couple.* of setfe are present near to the 

 spermiducal or male pores. They are the ordinary form but slightly larger than the 

 common setie. 



Oviducal 2)ores in xiv situated .somewhat nearer the median line than to the 

 inner couples of setae, and the distance between the pores is a trifle more than the 

 distance between setie 1 and 2 in the same somite. 



Prostate pores situated each on a small papilla. 



