140 CALIFORNIA ACADEMY OF SCIENCES. 



wniiber, 2 and 2 npeninri close fof/ether in the prostate pore. Typhlosole. Nephridin large, 

 maganephridia, not nlternnte, opening in front of set<n -i and A. Color mdkij irhlti', no 

 pigment. Habitat, Tepic, Mexico, 4000 feet nltitnde. 



Acanthodrilus tamajusi n. sp. 

 Figs. 87-9(1 



Habitat. Of this species I possess one adiiil and half a dozen young speci- 

 mens, principally from Tamaju on the rio Polochic in ( iiiatcniala. The largest in- 

 dividual measures about 150 mm., but even tliis 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 possessed a more perfect clitellum than the larger 

 specimen. These specimens were found by myself several yearn ago in June and 

 July on toj) of the ground after rain. It is probably a common species in tropical 

 Guatemala. On account of imperfect preservation of the specimens, some hi.stological 

 details are wanting. 



Color. Deep violet-brown and iridescent when alive. Skin pigmented strongly 

 on the tail, slightly on anterior i)art, 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 clilelkim. 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. fn 

 the unpigmented between vii and xiii. 



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

 somite i. 



Clitellum comi^lete, xiii to gxx. 



Penial setce. 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 couples of seta' are present near to the 

 s|)ermiducal or male pores. They are the ordinary form but slightly larger than the 

 common setse. 



Oviducal pores in xiv situated somewhat nearer the median line than to the 

 inner couples of seta?, anil the distance between the pores is a triilc more than the 

 distance between setjc 1 and 2 in the .same somite. 



Prostate pores situated each on a small papilla. 



