2f> CAFIIdllM A ACAI'KMY Ol' SCI ICNCKS. 



wliilc the tliroe anterior pt'iito-iicpliridio-iioies arc in front of the fonrtli seta- (fig 2). 

 ( "lilclliini is i'ons|»ici()us, oocti|)yin<; somites xiv to xvii, cncroacliini: >lit:litly on xiii 

 (li<,^ -1 and 1-")). 



In viewing tlie caiiilMl end nt' I lie live worm a nnmlxr of irregular white spots 

 are seen in mature sjiccinuiis. These are row.s of mature ova wliieh agglomerate there 

 sometimes in large quiintitiis. Ifuwllicy finally find llicir way through the ovithn-t 

 is not readily exj)lained. 



Sdd' (figs. 2 and 4). As usual the seta' hegin in somite ii. All except 

 those in the penial sacs, are sigmoid an<l arranged in rouplcs of two, eight in each 

 somite. The ventral setse are about ^ closer than the l;il( nil ones. Thus if we con- 

 sider the distance between the inner and outer couples to l)e ;jO, that between the 

 seta' of the outer couple is 30, that between the setic of the inner couj)le 22, that be- 

 tween the inner couples 40. This being the distance in somite xxvii, where it may 

 be said lobe nonnul. In the icgion of the clitelluni, and posterior to it, the inner 

 setaj are uneijually distant in the respective somites. Thus we may consider the inner 

 setif 1 and 2, to have the normal distance from each other in somites xii to xxvii. 

 From these two somites the set.e in the inner couples converge toward somite 

 xviii in which the seta' iwa about ^ as far apart as in xii and xxviii. In xvii the sette 

 of the inner couples are wanting. 



The innermost or row No. 1, forms a continuous line from one end of the body 

 to ihi' other, while the row No. 2, forms an angle with somites xvii and xviii at the 

 apex. The setfe in rows 3 and 4 are parallel and normal. The seta 1 in xviii is pre- 

 sent (pi. xii, lig. 4). 



This arrangenu'iit of the setai appears very constant, and is characteristic of 

 the species, the details being somewhat dilferent in the other species of the genus, 

 while the general characteristics are the same. The normal set:e (lig. IG) of the 

 clitelluni are not smaller than those of other parts of the body. The ])enial seta* are, 

 however, very nnieh the largest. 



/'enial seUe (fig. 17). The two pairs of sacs containing the peiiial seta' are situated 

 in front of the spermiducal pore in somite xvii. They open immediately in front of 

 that pore, in n slit, at either end of which is situated a pore, each pore being the 

 outlet for the respective fork of the penial sac. The two sacs are connected at the 

 ii|i|M r nnirgin as nsiial by Micifoiiu muscles. Each satt contains not less than two, and 

 soinctiniis three oi- four scla', straight or slightly curved, but not sigmoid. The seta- 

 vary considerably as rcgai'ds shape, but resemble each other in not being senlptured, 

 and are only mnrked by rings. The penial sac I'eachcs to the upper pai't of the mus- 

 cular j)art of the piostate. 



iNTKKioi; ( iiai;a(Ti:i;s. 



The S,'i,f,i iicgin between somites iv and v. Tliosi' between vii and viii, and 

 following as far back as soniile x'w, are slightly ihicUencd, all. ho\ve\er, itcing of the 

 a nu' general thickness. 



The /'"(/'/"■"// contains the usual liiyers. The hypodermic is sligiitly thinner 



