142 
\ iCiiOi.Lri AND Jackson. — X( w Species of iSIccialoscnJej. 
Megascolex longicystis sp. iiov. 
Plate XVHT, Figs. 1, 2. 
A number of specimens of tliis worm were collected at Armadale 
by ]\Iiss Fordliam and one of us (G.E.X.). It is obTiously closely re- 
lated to Mceiascolcjc coJUdus, described by INUchaelsen from Broome 
Hill (UHld), resembling that species closely in the extreme develop- 
ment of the diverticulum of the spermatlieca, wdiich in both forms 
is from five to six times as long as the s^nuanatheca itself. Close 
examinatiou revealed, however, the folhAviug differences: th' sper- 
mathecal pores are closer together than in 3/. colUnus, the pair of 
pa]>illae on furrow 19, 20 is wanting, and a third pair of sperm sacs 
is present in segment 10. ^richaelsen had but one damaged speci- 
men to work on and conseciueiitly was oljliged to query one or two 
of his statements, but even after allowing for the possibility of in- 
completeness ill the <lescription from this cause, there seems to be 
here sufticient difference to re<piire the establishment of a new 
species. 
Sp<cific I)iae/)iosis. Length, 70-S0 mm.; thickness, 8 mm.; num- 
ber of segments about 100. 
(olonring: Pur])lish-bi-owii .hnsahy, fading to yellowish-white 
ventrally. There is a dark mid.-dorsal line running th' whole 
length of the Avorm, but the snout and ])osterior end are Avhite ti])ped. 
The clitellum is noticeable only as a slightly i)aler baud covering 
segments 14-18. After ])roloiiged ]ireservation in s[iirit all colour- 
ing is lost and the clitellum becomes indistinguishable exce]d for a 
veiy slight fattening of the A-entral surface of those segments. 
The setal line is unbroken. The setae themselves are slender 
and sigmoid, Avith a slight notlulus Avhich is only occasionally 
noticeable. 
Tli(‘ head is epilobate. The })res:(miiiim is rounded and has a 
somewhat V-shaped projection into the peristomial segment. The 
peristomial segment itself lias a d.istinct ventral grooA'e. 
There are two pairs of si)ermathecal pores (Ph X\1II, fig. 1) 
on the anterior margins of segments 8 and 9. These are iiiA'isible 
to the unaideil eye, Imt under the microscope they are seen to lie in 
the third line of setae on each side. 
The male ]mres are on a jiair of small round ])a]ullae Avhich take 
the position of the secoml seta on each side in segment 18. 
Dorsal pores are present, the first one occurring l)etAveen seg- 
ments 4 and o. 
