PACIFIC COAST OLIGOCH.I'ITA. 13'J 



Piiraguay, viz.: D. nrtonephra, whicli appears to resemble ray B. rngosa in several 

 points, especially in having four ro\v.-> of nepliridia on eitiier side of the ventral median 

 line, or eiglit parallel rows in all. But it also diiiers in several others, sullicicnlly to 

 be arranged under separate species. B. octonephra has about 90 somites, B. rugosa 

 about lis. B. riKjonn possess penial setfe, which, as far as I can judge from Rosa's 

 description ai'c diflferent from those of B. 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. Too few of these characters have been figured, 

 and many have been entirely overlooked. The penial sette, whicli are of the utmost 

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

 less than do the spermathecjT?, the shape of whicli is only ajiproxiniately 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., vrklth 1 cm. in thickest part in front of clitellum; 

 number of somites about 218. Clitellum xiii to xx. First dorsal pore posterior to clitel- 

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

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

 vii, viii and ix. Sacnlated intestine commences in xiv. l^yphlosole present. Sperma- 

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

 X, xi, xii. Prostates four, much folded, opening 7vith penial setce. Nephridia large, 

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

 lowlands. 



Acanthodrilus Vasliti n. sp. 



Definition. Length 6 cm. by 2 mm. in the region of somite viii; number of 

 somites 92. Prostomium distinct, divides somite 1 about ^. Clitellum unknown. First 

 dorsal pore vii/viii; first large dorsal pore ix/x. Penial setce absent; common setm 

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

 duplex one. Oripores in front of setce 1 and 2. Spermathecal jwres in front of 

 setre 1 and 2, and betiveen somites vii-viii, viii-ix. Spermiducal pores in xviii in line 

 with setce 1 and 2. Sept'i v to xii slightly thickened. Gizzard in v. Sacculated intes- 

 tine in XV. No calciferous diverticula. Peritoneum covered rvith 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 



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



