Vol. IX, No. 1.] Oligochaeta from the Lake of Tiberias. 55 
[N.S] 
The chief points of interest in the foregoing description 
re 
i) The clitellum. Hoffmeister (quoted in Vejdovsky, 
System u. Morphologie der Oligochaeten, Prag, 1884) and ined 
(Q.J.M.8., ns., vol. xxvii) found no clitellum. Benha 
estimate of its length (Q./J.M.S., n.S., vol. xxvii) is on the ee 
hand considerably greater than 
(ii) The distribution of the venitat papillae differs from what 
is given by Orley, or by Michaelsen (Oligochaeta, in Tierreich). 
(iti) With ae and Benham, whose statements are 
therefore, it may not have developed, owing perhaps to their 
eing in an early stage of sexual maturity ; that this was so 
is perhaps indicated by the fact that in one specimen the testes 
and funnels were noted as being large and conspicuous ; Ben- 
ham, who found the testes deeply situated eg difficult of 
discovery, probably had later stages to deal w 
v) The shape of the spinosa is however not 
reconcilable with earlier observations, e.g. Hoffmeister (ap. 
part of the 6-8 mm. long tubular spermatophore described by 
the latter author has regularly been broken off, leaving only 
the basal portion. 
Helodrilus (Dendrobaena) lacustris, sp. nov. 
In wet mud under stones at edge of lake, near Mejdal 
(Magdala), Lake Tiberias, Palestine ; October 25, 1912. With 
Criodrilus lacuum. Three specimens. 
Length 1} ins.; breadth 1-1} mm. ; colour greyish, with 
blue am anteriorly. Segments 71-87 
Prostomium proepilobous (in one case only slightly so). 
Clitellum saddle-shaped, xxiv or xxv~xxx, = 6 or 7; with 
lateral ridges xxvi-—xxvili or xxix at its ventral limit on each 
side. 
Male pores xv (only made out in pepe’ Copulatory 
