BRANCHIURA SOWERBYI BEDDARD. 301 
Hakenborsten. Méannliche poren am 11, Samentaschenporen am 10 segm. Supra- 
intestinalgefass und Subintestinalgefiiss vorhanden; ‘Transversalgefiisse des 8 und 7 
Segm. herzartig: integumentaler Blutgefissplexus meist vorhanden, aber spiirlich. 
Nephridien mit Endblase. Hoden im 10 Segm.; Samenleiter lang, in das proximale 
Ende der Atrien einmiindend; Atrien mit einer grossen Prostata; Penis mit Chitin- 
scheide. Samentaschen im 10 Segm. Spermatophoren in den Samentaschen.” 
The present, therefore, differs from other species of the genus in the absence of a 
subintestinal vessel; in the presence of only one pair of hearts; in the absence of a 
terminal dilatation of the nephridial canal; and apparently in the ventral position of 
the dorsal vessel. But having regard to the rest of the anatomy, especially the 
characters of the setze, of the genital organs, including the chitinous penis-sheath, and the 
eutaneous blood-plexus, there can be little doubt that it should be included in the 
genus. 
Of the species within the genus, it resembles most closely L. hoffmevsteri, Clap., 
with which it appears to be very similar in its general appearance, size, number of 
segments, number of setze per bundle, characters of brain and pharynx. None of these, 
however, are particularly distinctive ; more striking are the investment of the anterior 
nephridia with bladder-like (blasenférmigen) cells, and the number of cutaneous twigs 
per segment. ‘The general proportions of the penis-sheath are much the same; but 
the curve of the tube and the character of its mouth differ considerably (cf VEJDOVsKY, 
11, pl. xi. fig. 4). The mode of origin of the cutaneous capillaries, the fact that they 
do not end blindly in the present species, and that the dorsal and ventral vessels are, 
as usual, on opposite sides of the alimentary tube in L. hoffmeisteri (cf. VEIDOVSKY, op. 
cit., pl. viii. figs. 16, 17), on the same side in this species, as well as, presumably, the 
points given above wherein this species differs from all others of the genus, also serve 
to distinguish them. 
I propose the following diagnosis :—Colour pale reddish brown ; length 40-75 mm. ; 
segments about 110, double annulation in the first few; prostomium bluntly conical ; 
clitellum xi-} xii. Sete 6-8 per bundle anteriorly, 3-4 posteriorly. A single pair of 
hearts in viii; dorsal vessel is ventral in position, to left of ventral vessel, from posterior 
end as far as genital seements; no subintestinal vessel. Nephridia in vii and viii invested 
with large pyriform peritoneal cells; no nephridia in ix—xil; not present in every 
segment from xiii onwards. Cerebral ganglion deeply cleft in front, slightly so behind. 
Chitinous penis-sheath 10-11 times as long as its widest part is broad, curved forwards 
at its lower end, where its anterior lip is strongly reflexed upwards. 
TRANS. ROY. SOC. EDIN., VOL. XLVTII. PART II. (NO, 15). 46 
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