TSR k I IT FOR LILLJEBORG 



The shape <•( the spermathecae is different from that of those organs in Pontoscolex 

 thrums .1- figured by Perrier, or as observed by mein Pontoscokx corethrurus 

 mexicanus. It does not possess any long duct, and the apical sac rests immediately 

 on the body wall, to which it is attached by two strong muscular bands. The narrow 

 duct is entirely confined to the body wall. 



Habitat. This species is entirely aquatic. I found it in a milldam at Portal 

 near Antigua, Guatemala. It is a small, entirely transparent worms, of a glassy appear- 

 ance, more pellucid than any other oligochaeta which has been observed by me alive. 

 My specimens not being in good preservation, no sectioning was attempted. 



Pontoscolex corethrurus (F. Müller) 



var. mexicanus mihi. 



Definition. Length ijj mm. to in mm. Width in front of clitellum at 

 narrowest part j mm. Somites from i.fj to 212. Setce slightly bifid and faintly or- 

 mi men ted. Penial setce four on each side, ornamented. Prostomium prominent but fre- 

 quently retracted. Caudal- ~one: from end of zone to end of tail 2S to 7 '6 somites; from 

 to zone roy to 118 somites. Clitellum xv to \ xxiii. Tubercula pubertatis an 

 elevated ridge in j xix— \ xxiii. Nephropores in line rvith setce c, spermathecal pores in 

 line with seta e. No increase of blood vessels in the caudal-zone. Gizzard in vi. Sac- 

 culated intestine m xvii. Caleiferoits diverticula in vii, viii, ix. Spermatheca' open in 

 the posterior part of somites vi, vii and viii, but their duct, as well as body, is re- 

 spectively in somites vii, viii and ix. The duct is very long and narrow, the body is 

 pears/taped or oval. Hearts in xi and xii. Testes, one pair, in xi. Ciliated rosettes, 

 one pair, in xi. Spermsacs, one pair, extend from xi to posterior part of clitellum. 



Habitat: Pacific coast of Mexico, Tepic 4,000. 



This species and variety has probably a very extensive distribution along 

 the Mexican coast and in Central America. 



The sense cells in Pontoscolex corethrurus, 



var. MEXICANUS. 



lh. specimens of this worm on which my investigations were based, were 



In -in the highlands around Tepic, Mexico. The species-characters as noted in the 



mpanying table of the spi 1 i< oi Pontoscolex were derived from a study of them. 



