m 



lAllliiUMA AIAUKMI' UK SCIKNCES. 



lliiiii likclv that :i iiiislakc- Wii.s iniuU-, as Ik-iiliaiii has already pointotl out. IJiit on the 

 othiT hand 1>( iiham's worm camo from (^uccii Charlotte's Islands in the Pacific, while 

 I'erricr's worm came from the Atlantic Coast, many thousand miles away, and it will 

 always he impossihle to with certainty decide upon the position of the ovaries in 

 Terrier's Plutellus until the orij^inal worm has again heen investigated. That it will 

 Itc found to entirely agree with the normal type I do not douht. 



From I'hitellus our Argilophilus differs in several important points besides the 

 location of the luphridio-pores. First, in regard to the luimher oi the ciliated rosettes — 

 in I'lulellns only one ])air, in Argilo{)liilus two pair. One pair of sperm-sacs in PI u- 

 lilhis, ihice pail- ill Argilophilus. One pair of testes in Plutellus, two pair in Argilo- 

 philus. l-'oiir pair of small speiniatheea in Phitellus, two very large ones in Ai'gilophilus. 

 Perfect clitellum in Plutellus in at least two somites, ventrully im])erfcct clitellum in 

 Argilophilus. In other respects the two genera resemble each other greatly, and 

 through the respective arrangement of the nephridio-pores, they form a distinct tribe 

 oi- sub-family foi' which T propose the name I'/titc/Zivi. 



The following table will show the principal characteristics of the two genera: 



Proslomium ilovctnilin;,' the peri- 

 stoniuiu 



Clildlum 



Nephridio-pores. 



Gizzard in , . 

 Spermalhtcu 



Sjtirm-finniri 



Tenien 



Sprrm-nacH 



Onary nnil oriiliirl in 



Ofi/iorr ill 



Afnii porr in 



Prostate 



Ari/ifojthihis. 



rartly. 



Ventrall.Y imperfect. 



lu front of setii' .3, 4, and outside of 4; gen- 

 erally the latter, the arrangement being 

 in-egular. 



Sfphriilid eoninjonce in. 



iVipltriilial lilfidilrr at tlip pntraneo 

 lo tJK' bcHlywall 



\'iiilnil impillii nil till- K'icly wall 



('itptilitti)nj Mi^tn 



TjiphloHolc . . 



Two very large pair in vii and viii. 



Two )iair in x and xi. 



Two pair in x and xi. 



Three ])aiv in x, xi, xii. 



xiii. 



xiv. 



xviii. 



Very large, coiled, extending through several 

 somites. 



AliHent, tile iliict lieiug Hinglp and straight. 



Present in pairs or in a single one. 



Present. 



A siiihII typhliiHolc present. 



I'luteUus. 



Completely. 



Veutr.illy perfeet in at least two 

 somites. 



In front of ."i and 4, alternating 

 rather regularlv. 



Four or live pair in vi, vii, viii 

 and ix. 



One pair in x. 



One pair in x. 



One pair in xi. 



xiii. 



xiv. 



xviii. 



Straight, tubular, not very large, 



eontiiietl to one somite. 



Large, but of varying size in the 

 I two series of nephridia. 



Absent. 



Ahs.Mit. 



No typhloside. 



