PACIFIC COAST 0LIC30CH^,TA. l25 



respective species either diffuse or micronepliridia arranged in three, four or more 

 rows on either side, some species showing several gradations. Spermatheca two pairs, 

 contracted at center witli one or more small diverticula, Penial setne nearly always 

 present. Generally small, tropical worms. 



DEFINITIONS OF AMERICAN SPECIES OF BENHAMIA. 



Benhamia nana n. sp. 



Definition. Size — Length :W to JO mm.; nnmher of somites 110; skin strongly 

 pigmented. Fird dorsal pore between iii/iv. Prostomium very svjollen and overlapping. 

 Clltellum complete in central somites. Penial sette, the largest with 12 or more bristles. 

 Common setce, distance between the dorsal couples about equal to that between the ventral 

 couples. Oviducts, two pores, open in front of 1 and 2. Prostate pores not on pap'Mm. 

 Pharynx situated very far forward. Gizzards in viii and ix. Calciferous diverticula, 

 two pairs in xv and xvi. Sperm-sacs in x and xi. Spermducts thicker at the base in 

 xviii, xvii and xvi. Nephridia in three rows on either side, the posterior ivith coelomic 

 mantle. Spermatheca, basal part with one diverticulum, apical part warty and irreg- 

 ular. Typhlosole large, begins in xviii. Color broiunish red. Habitat, San Bias, 

 Mexico, at sea level. 



Benhamia mexicana Rosa. 



Definition. Length .iO mm.; number of somites 120. Skin not pirpnented. 

 First dorsal pore between iii/iv. Prostomium divides the first somite completely. Cli- 

 tellum complete in xiii to xxi. Penial setce not ornamented (? ); common setce, 3 and A 

 further apait than 1 and 2. Oviducts, two separate pores in front of 1 and 2, on small 

 2)apill(e. Gizzards in viii and ix. Calciferous gland 3 pairs in xv, xvi and xvii. Ne- 

 phridia in 3 roros on either side. Spermatheca luith a single short diverticulum. Alco- 

 holic specimen colorless. Habitat, Durango, Mexico, at 2500 meters altitude. 



Benhamia Bolavi Michaelsen. 



Definition. Length 40 to 00 m^in.; number of somites 97. I\rst dorsal pore 

 between v/vi. Clitellum incomplete in all somites, xiii to xx. Penial setce, the largest 

 with five to eight notches, the smaller spoonlike and slightly forked; common setce couples 

 equidistant. Oviducts opien in one single pore on a median papilla in xiv. Gizzard two 

 in vii. Calciferous gland three piairs in xv, xvi and xvii. Sperm-sacs one pair in xi. 

 Nephridia in three rows on either side. Spermatheca, the basal part with a single small 

 diverticulum. Saculated intestine begins in xxi. Color dingy flesh. Habitat, Venezuela 

 [and Hamburg). 



Benhamia palmicola n. subsp. 



Definition. Length 50 to 60 mm.; number of somites 00. Skin not pigmented. 

 First dorsal pore between iv/v. Clitellum incomplete in all somites. Penial setce, largest 

 vnth four notches, the smaller one sjMonlike and forked; common setce about equal dis- 

 tance betrveen the dorsal and ventral as betujeen the ventral couples. Oviducts open in one 

 single pore on a median papilla. Gizzards both in viii. Calciferous gland 3 pairs in 



