PACIFIC COAST OLIGOCH UTA. 139 
Paraguay, viz.: B. octonephra, which appears to resemble my B. rugosa in several 
points, especially in having four rows of nephridia on either side of the ventral median 
line, or eight parallel rows in all. But it also differs in several others, sufficiently to 
be arranged under separate species. BL. octonephra has about 90 somites, 2. PUGOSA 
about 118. . rugosa possess penial setse, which, as far as I can judge from Rosa’s 
description are different from those of L. octonephra. 
Unfortunately, the characteristics of Benhamia species must be founded on 
most minute characters, which cannot always be expressed in words, as long as so com- 
paratively few species are known. oo few of these characters have been figured, 
and many have been entirely overlooked. The penial sete, which are of the utmost 
importance as species characters, should be in all instances figured. They vary much 
less than do the spermathec, the shape of which is only approximately constant. 
ACANTHODRILUS Perrier. 
Out of thirty-five species of this genus, which have been described to date and 
recognized by Beddard, none have been found as far north as Central America or 
Mexico. The two new additions to the genus which I am able to describe below will 
therefore prove of considerable interest on account of their habitat so far north, while 
one of the species shows a combination of characters rarely met with in this genus. 
DEFINITIONS OF SPECIES. 
Acanthodrilus tamajusi n. sp. 
Derimition. Length 15 cm., width 1 em. in thickest part in front of clitellum; 
number of somites about 218. Clitellum aiii to vx. First dorsal pore posterior to clitel- 
lum. Penial setw ornamented, one seta only in each sac. Common sete paired. Pros- 
tate pores each ona round papilla. Gizzard inv. Caleiferous diverticula 3 pairs in 
vii, nit and ix. Saculated intestine commences in xiv. Typhlosole present. Sperma- 
theca large sac-like, with a few small warty diverticula. Sperm-sacs not racemose, in ix, 
v, wi, vit. Prostates four, much folded, opening with penial sete. Nephridia large, 
meganephridia, not alternate. Color reddish, partly pigmented. Habitat, Guatemala, 
lowlands. 
Acanthodrilus Vasliti n. sp. 
Derimition. Length 6 em. by 2 mm. in the region of somite viii; number of 
somites 92. Prostomium distinct, divides somite 1 about 4. Clitellum unknown. First 
dorsal pore vii/viii; first large dorsal pore ix/x. Penial sete absent; common seta 
paired, 1 and 2 not present in xvii and xix. Prostate pores not on papilla; each pore a 
duplex one. Ovipores in front of sete 1 and 2. Spermathecal pores in front of 
sete 1 and 2, and between somites vii—-viii, viitiix. Spermiducal pores in xviii in line 
with sete land 2. Septa v to wii slightly thickened. Gizzard in v.  Sacculated intes- 
tine in xv. No caleiferous diverticula. Peritoneum covered with a single layer of very 
large glandular cells. Very large suprapharyngeal gland, and a very small subpharyn- 
geal gland. Spermatheca long tubular in viii and ix, no diverticula. Prostates 8 in 
Memorrs, Vou. II, 5. December 16, 1895. 
