DESCRIPTIONS OF GENERA AND SPECIES 203 



septa Vl/IX thickened slightly ; sperm-duct perforates body-wall on Us way to spermiducal 

 gland. Ilab. Nilgiris, India. 



This species is, thanks to BENHAM'S researches, one of the best known. It comes 

 near to M. barwetti and M. bahamensis. Like that latter species, it has a protru- 

 sible muscular sac, connected both with the spermatheca and with the spermiducal 

 glands. The latter are bound down to the parietes by a few muscular strands 

 a state of affairs which recalls the similar glands in the Geoscolicidae and certain 

 Eudrilidae. 



The sperm-duct runs for a part of its course in the thickness of the body-wall ; 

 this occurs also in the species M. viridis, but has not been noticed elsewhere; there 

 are other worms in which the sperm-duct has this rather unusual course, which 

 belong to so many different groups that it cannot be of importance as indicative 

 of any affinity (see p. 100). The interior of the sperm-sacs are divided up by trabe- 

 culae ; though they appear to be suspended in the septum which divides segments x/xi, 

 they are seen in sections to lie really in segment x, the wall of which bulges back 

 at the place where the sperm-sac is attached to it. The muscular sac in which the 

 spermathecal duct ends is remarkable for lying in two segments ; it is in conse- 

 quence bilobed, but the spermathecal duct enters it exactly in the middle between 

 the two lobes. 



(7) Moniligaster viridis (NEW SPECIES). 



Definition. Length, 350 mm. ; breadth, iSmm.; number of segments, 186; gizzards in 

 XV-XV1II ; spermiducal glands long ; egg-sacs in XIV, not extending beyond this segment. 

 Hab. Borneo, Penrisen Hills, Sarawak. 



Of this new species I have been able through the kindness of Mr. EVERETT to 

 examine a couple of specimens. It appears to be a perfectly distinct new species, 

 coming nearest to M. houteni; it resembles that species in the fact that the ovaries 

 are two segments further back than they are in all others. There are, however, 

 several points in which M. viridis differs from M. hov.teni; the most obvious 

 difference is perhaps in the fact that the spermiducal glands are bent upon them- 

 selves so that the two ends are in actual contact ; the reason for this is that the 

 sperm-duct after leaving the sperm-sac passes straight down to the ventral body- 

 wall, and there perforates the muscular layers of the body-wall, only emerging to 

 enter (after a short course) the summit of the spermiducal gland; in M. hmiteni 

 HORST has figured (1, fig. i) the glands as lying straight, and he expressly compares 

 them to those of Acanthodrilus, which are not bent upon themselves in the way 



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