73 



dia in each somite, a preliminary note may be of interest. The 

 worm, which was preserved in spirit, measured only 50 mm, in 

 length , and 6 mm , in breadth : it is thus very short in proportion to 

 its breadth : and from this fact I have named it, provisionally, BracJiy- 

 drilus. 



Its locality is unfortunately imknown. The prostomium is small, 

 but distinct: and the clitellum is not well marked — perhaps the 

 worms are immature — but the ventral surface of the somites XVI to 

 XXI, are thicker and more glandular-looking. 



The setae are exceedingly minute: they are arranged in four 

 couples, all on the ventral surface. In front of the clitellum the inner 

 couples diverge from one another, till in somite VII, each inner couple 

 is close to the outer couple of its side : so that here all four setae, of 

 eade side, are close together. On the ventral surface of somite XVIII, 

 is a deep transverse fossa: into which the spermducts open to the 

 exterior : the anterior wall of the fossa is raised into two papillae in 

 the line of ventral setae close to one another , which in the contracted 

 state of the worm are directed backwards into the fossa. 



Of the internal organs I need but say a few words here : the ali- 

 mentary canal is provided with a gizzard in somite VI or VII : and 

 in the next following somite is a pair of patchlike diverticula : each 

 connected with the main canal by a narrow neck and having a struc- 

 ture very similar to that of the oesophageal glands of Lumbricus and 

 other worms. 



The seminal reservoirs are paired irregular masses lying in 

 somites X and XI, attached to the anterior septa: these enclose the 

 four ciliated rosettes, whence the sperm-ducts pass to the body wall : 

 here they become imbedded in the very thick layer of connective 

 tissue which in this worm lies within the longitudinal muscles. Where 

 the two ducts of one side join, I have as yet not determined. There 

 is no »prostate« or glandular diverticulum of the distal end of the 

 spermduct : but on each side is a very large muscular (? glandular also) 

 »atrium«, as in CriodrUus and Titanus: this occupies about six somites 

 (XV to XX) and is doubtless due, in part at least, to the contracted 

 condition of the worm, causing the dorsal wall of the above mentioned 

 fossa to project in wards. 



The ovaries lie in somite XII: an unusual position. 



The spermathecae differ in structure and in position from 

 those of any other worm except Microchaeta^ . In the hinder part of 



1 B e d d a r d , Trans. Zool. Soc. XII. 1886. pi. XV, and B e n h a m , Quart. Journ. 

 Microsc. Sc. XXVI. 1886. pi. XV, and XXVII, pi. VIII. 



