Earthworms of the Vienna Museum. 129 
upon a given segment are separated from each other by wide 
intervals. 
The sete upon the general body-surface are not orna- 
mented, which is a further point of resemblance to Diacheta 
Thomasii ; but they were in a few cases unmistakably bifid, 
as in Pontoscolex corethrurus. It is seldom that the free 
extremity of the sete in either of these species shows the 
bifidity clearly; they are generally apparently too much 
worn, and a faintly marked notch, readily passed over, alone 
indicates the cleft. It 1s quite possible, therefore, that Ponto- 
scolex arenicola and Diacheta Thomasti may really possess 
the same notched sete which Perrier first described and 
figured for “Urocheta corethrura.” The sete upon the 
clitellar segments are larger than some of the others and are 
distinctly ornamented with a series of crescentic ridges limited 
to the distal part of the seta. ‘This particular form of seta is 
very characteristic of the Geoscolecide, particularly upon the 
clitellum, and the fact that similar sete: occur in Créodrilus 
is a strong argument for regarding that genus as being related 
to this family. Benham makes no remark about the cli- 
tellar setez of Diachwta Thomasii. I may mention that this 
peculiar ornamentation of the sete in the Geoscolecide often 
requires some looking for; it is not always very strongly 
marked. 
As in the last species, there is no prostomiun. 
The clitellum is extensive, occupying segments Xvi.-xxxi. 
Schmarda has mentioned that the clitellum sometimes consists 
of fifteen rings, commencing with the fifteenth. 
The nepbridia are furnished with those peculiar cup-like 
bodies at their termination which Perrier first described in 
Pontoscolex corethrurus and regarded as sphincters for the 
closure of the nephridial pore. 
The spermathece (figs. 4, 5) are exceedingly long thin sacs, 
hardly, if at all, dilated at the blind extremity, where the 
semen is stored. There are here again only two pairs; each 
measures about 5 millim. in length, which is half the cireum- 
ference of the worm in the region where they occur. 
The mucous gland, gizzard, and thick mesenteries appear 
to be as in the last species. 
“Fypogeon orthostichon,” Schmarda. 
‘This species clearly belongs to the family Cryptodvilide, 
which comprises the majority of the Australian earthworms : 
it is not a characteristic family in New Zealand—at present 
Ann. & Mag. N. Hist. Ser.6. Vol. ix. i) 
