-is CAMI'OliNIA At'ADKMY OK SCIES(;ES. 



Iul)iiliir iiftwork, wliicli only ynnliiiilly fuses itself into one duct with nnincmus 

 l)riin('IiinL^ diictnlis, while in Lunilnieus the sintfle duct e"ntinu(!s tliiou^^h the difTer- 

 cnl loltcs iind in recurring winds around itself. The tuhidcs in Argilophilus eni- 

 liriici' ihc two tiihcs liut cease after leaving the lir-t fold, 'i'lic muscular duct which 

 is so |ironiinent in Ijumhricns is not represented in Argilopliihi-, Itiit is replaced hy an 

 elongalion of the single wide IiiIm' ((Mrcspondiug lo ihc " wide lulu- of the od lolte " in 

 Liiinhricus. 



Compared agiiin with the ncpliridimn of Dcllaiii.i, we iind that the principal 

 difference consists in tin- ah.sence of tlie urinary Madder and the collar at the ne- 

 |diridio-pore as well as in the absence of a Cfxical Madder. The irregular or alternate 

 locations of the nephridio-pores distinguish Argilophilns and Plntellns from all other 

 earthworms, as far as known. 



Alimcntnnj rnnnl (fig. 87 to 02). The Imcnil, cnvlti/ is, jis has been stated, 

 greatly ever.-il)le, and generally remains everted after the worm is dead. The 

 phnryn.r is only developed siiperinily tlinngli I here is a slight thickening of the lower 

 wall ol llie liiieeai cavity at llie junction willi llie le-opliagns, at which place numer- 

 ous muscles are seen to connect with the lower part of the body-wall. The pharynx 

 is as usual furnished with numerous salivary glands (fig. 8(), aL (/I.), extending from 

 the vicinity of the brain to the posterior part of somite iv, the mo.st posterior glandular 

 mass being the largest (fig. .SCi). The various glandular lobes offer some characteristics, 

 wliicb if carefully noted and compared may be I'ouud to be constant enough to serve 

 us species characteristics. 



The n^'ji^opluuivii begins in iii and occupies somites iii. iv and v, (fig. cSr>, .1. n .) 

 forming first a narrow tul)e, which widens out, and rising upwards connects with a 

 very hii'ge gizzard (72.). This r/izzard occupies in reality oidy somite vi, but its great 

 length causes it to j)ush fai- bacdcward to such an extent that it actually occupies the 

 space covered by viii and sometimes by ix. The gizzard is compres.sed from above, 

 but widened laterally wliicdi makes it ajipear very much larircr when viewed from 

 above than when seen in vertical section. It connects posteriorly, in vii, with a very 

 long narrow li/lin/iir infcxfinc, which extends to somite xii, luil wliieli in sduiites xiii 

 to XV is strongly nipjied by the septa and e(aisideral)l\' enlarged (tig. 8(», s,) withoiU, 

 howevei', being st rietly saccudated. 



'i'lie ii(ii-ciil(il('d intestine ])roper, however, begins first in xvi, an<l is mu(di wider 

 than the other part of the alinu-ntary canal. The structure of the pharynx oilers 

 nothing of iiiuisual interest. The wall of the gizzard contains the usual layers, biU they 

 are poor in blood vessels. The longitudinal muscular layer is ihiidcesi, and on the 

 widest pari of the gizzard it is live or six limes as thick as tlu' epithelinm, gradually 

 diminishing in size anterioi'ly and posteriorly (ligs. 8(5, 87, 88, 8U). 



/'iiti-s/nipcd ity ( '/u//ii!i ( '/iinii/icrs. Beginning ininndialely lieliiinl the gizzard, 

 and extending throughout tin Inludar intestine, wi' liinl imliediled between the 

 cpilheli;d folds nnmerons pe:ir-~liapei| organs of duniilful lunctioti. In pronouui'iug 



