PACIFIC COAST OLIGOCH TA. 161 
dorsal. The direction of the spermathecz is in the diameter of head to tail. They 
lie closely pressed to the body-wall. As regards size, the most anterior pair is the 
smallest, and the most posterior the largest. 
Sparganophilus Benhami n. sp. 
Figs. 97-119. 
Habitat.—In the mud of springs, October, November, 1894. Tepic City, Ter- 
ritory of Tepic, Mexico, 4000 feet altitude. Of some fifty specimens collected only 
three were well iceeloned as regards clitellum and tubercula pubertatis. 
EXTERIOR CHARACTERS. 
Color, reddish-yiolet, yery strongly iridescent. The violet tint is very pro- 
nounced, much more so than in any other species that I have examined except Sp. 
guatemalensis, where the bluish-violet tint is very deep and intense. 
Body. ‘This isa long and slender species tapering towards the tail end. The 
cephalic lobe is superiorly not distinct from somite i, but there is a small pit on the 
boundary between the two. Somites i, ii, iii are less prominent. Somites iy to ix are 
strongly convex, but x to xv are much less so. The clitellar intersegmental grooves 
are only distinct between the ventral sete. 
Dorsal pores. The most anterior dorsal pore is seen between i/ii; the most 
posterior one between v/vi. There is a central pit in the dorsal side of somites i, ij, iii. 
Chitellum, as in other species; the extent of the clitellum is different on the 
dorsal and ventral sides. This I think can best be expressed thus: dorsally, }xiv— 
xxiv; ventrally, xvii—xxvi. The clitellum is continuous, but much less developed 
ventrally between the tubercula pubertatis than dorsally. This is also characteristic 
of the other species I have examined. Viewing the clitellum exteriorly, it appears 
as discontinued between the tubercula pubertatis ridges. 
Tubercula pubertatis begin in xviii and end in xxii. Each one consists of a 
straight ridge on the top of which runs a groove parallel to the ridge. Posterior ‘to 
the tubercula pubertatis proper the eel part of the clitellum is concaye deepening 
posteriorly and ending in a deeper pit in the posterior part of xxvi. Anteriorly the 
tubereula pubertatis Ree continue forwards almost straight and outside of the ventral 
sete 1 and 2 to the center of xii, where they end in the region of the ventral sete. ‘These 
two almost parallel ridges are very thin and sharp, several times narrower than the 
tubereula pubertatis proper. They only appear in fully adult specimens, and are very 
characteristic. I believe that the underside of the clitellum will furnish good species 
characteristics if carefully noted. But in order to bring out this region properly the 
specimens must be slowly killed and then as rapidly as Hens be passed through the 
alcohols into that of 96%. Formalin specimens do not show the region as well as 
alcoholic specimens. 
Male pore or spermiducal pore is situated on the anterior } of xx, just lateral 
to the tubercula pubertatis. The pore is not prominent, but may ii readily seen. 
Prostate pores are not prominent, but in adult specimens they may be seen in 
front of sete 1 and 2 in somites xxiii, xxiy, xxv, xvi. 
