PACIFIC COAST OLIGOCH^TA. 139 



Paraguay, viz.: B. odonephra, which appears to resemble my B. rucjosa 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 ari-anged under separate species. B. odonephra has about 90 somites, B. rugosa 

 about 118. B. rugosa possess penial setse, which, as far as I can judge from Rosa's 

 description are different from those of B. odonephra. 



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. Too few of these characters have been figured, 

 and many have been entirely overlooked. The penial setae, which are of the utmost 

 importance as species characters, should be in all instances figured. They vary much 

 le.ss than do the spermathecae, 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. 



Definition. Length 15 cm., width 1 -cm. in thicked part in front of ditellum; 

 numher of somites about ^IH. Clitellum xiii to xk. First dorsal pore posterior to ditel- 

 lum. Penial seta' ornamented, one seta only in each sac. Common setce paired. Pros- 

 tate pores each on a round papilla. Gizzard in v. Oalciferous diverticula 3 pairs in 

 vii, via and ix. Saculated intestine commences in xiv. TyjMosole present. 8perma- 

 theca large sac-like, ivith a few small warty diverticula. Sperm-sacs not racemose, in ix, 

 X, xi, xii. Prostates four, much folded, ope^iing with penial setce. Nephridia large, 

 meganephridia, not alternate. Color reddish, partly pigmented. Habitat, Guatemala, 

 lowlands. 



Acanthodrilus Vasliti n. sp. 



Definition. Length (J cm. by 2 mm. in the region of somite viii; number of 

 somites 92. Prostomium distinct, divides somite 1 about h. Clitellum unknoion. First 

 dorsal pore vii/viii; first large dorsal pore ix/x. Penial seUe absent; common setai 

 paired, 1 and 2 not present in xvii and xix. Prostate pores not on j^apilla; each pore a 

 duplex one. Ovipores in front of setce 1 and 2. Spermathecal pores in front of 

 setce 1 and 2, and between sojnites vii-viii, viii-ix. Spermiducal 2}ores in xviii in line 

 ivith setce 1 and 2. Septa v to xii slightly thickened. Gizzard in v. Sacculated intes- 

 tine in XV. No calciferous diverticula. Peritoneum covered ivith a single layer of very 

 large glandular cells. Very large suprapharyngeal gland, and a very small subjyharyn- 



geal gland. Spermatheca long tubular in viii and ix, no diverticula. Prostates 8 in 

 Memoirs, Vol. II, 5. December 16, 1895. 



