-08 KKCORDS OF THK AUSTHALIAX MUSKUM. 



are tilled with loose masses of developing spermatozoa. The 

 sperm funnel is Hat, leads into a sliort and delicate duct which 

 passes directly downwards after piercing the septum to enter the 

 eleventh segment ; here it passes below the ovary, and I have 

 been unable to trace it accurately amongst the ova — it winds 

 somewhat and appears again neai- the apex of the atrium. Its 

 course, indeed, is similar to that in Tauj/odi-ihis simplex, but it 

 does not coil round the atrium as in that species. 



The Atrium is a cylindrical organ, rounded at its upper end. 

 It presents three more or less distinctly marked regions — the sac, 

 the neck, and tlie atrial duct — each having a structure similar to 

 that described by Beddard (1) in JL suwpybiji. That is, the sac 

 itself is lined b}' tall glandular cells similar to those described and 

 figured by me for Taapodrilus simjdex ; the short neck, which is 

 not abruptly marked off, is lined by cubical cells (I was unable to 

 detect cilia in my sections, though no doubt they exist as in other 

 species), but the duct, which is sharply differentiated, is lined by 

 columnar cells, which support a distinct cuticle, continuous with 

 that of the outer epidermis (PL xlvi., fig. 8). The wall of the atrium 

 is muscular, and outside this coat is a layer of "prostate cells" of a 

 form essentially similar to those described and figured by Beddard 

 ( 1 )'' and (Stole (14). In fact, except for minor details, the apparatus 

 is characteristically Branchiuran. There is no penis other than 

 the l)unch of copulatory clneta^ on their papilla. 



The spermatheca, situated on each side of segment x., is 

 relatively small, pyi-iform in shape, with a short distinct duct, 

 bent at right angles to the ampulla (PL xlvi., fig. 9), to open 

 laterally as above described. Though the ampulla is tilled with 

 spermatozoa, they are not moulded into a spermatophore. 



The Vascular SyHtem. — Two pairs of enlarged "hearts" are 

 visible in the entire specimens, lying in segments ^•iii. and ix., 

 while in trans\erse sections, a third is seen in segment x. 



The usual narrow, undulating commissurals are present in the 

 remaining segments. I was unable to detect a " supra intestinal 

 vessel," except possibly in segments x., xL, xii. — for in. these 

 segments, in transverse sections, two vessels lie above the gut, a 

 larger, the "dorsal," and a smaller one below it, which may be 

 the " supra intestinal." Further back, and further forwards, 

 only a single vessel is visible above the gut; and throughout only 

 a single one, the " ventral " vessel below. In the greater part of 

 the body the commissural vessels instead of going directly from 

 the dorsal to the ventral vessel, break up into a more or less 

 elaborate plexus on the body wall (PL xlvi., fig. 12), and in the 



'' For i-eforonces minibered in brackets see Bibliograjiliv at end of paper. 



