Two neic Eaithwonnst. 40 1 



project forwards. In segmont xii are another pair oCun loubtcil 

 sperm-sacs, which are small, smooth, and rounded, and uttaclied 

 to the anterior wall of that segment. I t'ound developing 

 sperm in these, wliich settles their nature, otherwise, perha[)s, 

 on account of their small size, doubtful. 



'I'he anterior j)air of supposed sperm-sacs seem, however, 

 rather to be put down as seminal sacs projecting or bul"-in>'- 

 into segment ix, for a destruction of the wall of the sac 

 reveals the anterior pair of funnels lying inside. Corre- 

 sponding, however, to the small rounded sper.n-sacs of seg- 

 ment xii are a perfectly similar pair in segment xi ; so that 

 tliis species appears to be different to B. sylvestris, where 

 Michaelsen locates the sperm-sacs in segments x and xi. 

 He mentions, however, a i^iojection of tlie sperm-sac into 

 segment xii, an appearance which may possibly bj correlate 1 

 with greater maturity and a consequent fusion of sacs originally 

 distinct. 



The ovaries are fairly conspicuous and lie, of course, in 

 segment xiii. 



The spermiducal glands of this species are very large and 

 much coiled. They are so bulky as to extend into a segment 

 on each side of that which bears their external orifice. I do 

 not think it possible to say that the anterior pair show any 

 difference in size from the posterior pair. The muscular duct 

 is rather long and folded upon itself. It is of less diameter 

 to begin with, widens in the middle tract, and again narrows 

 before its opening on to the exterior. Between the gland and 

 the duct there is no sharp demarcation. The duct itself has 

 the usual nacreous appearance, due, of course, to the muscular 

 folds of its walls. But before tiiis nacreous appearance is 

 visible is a narrow tube of tlie same a])pearance as the 

 glandular part, but n-.arked off from it by its narrower calibre, 

 which is suddenly acquired. This region, as it appears to 

 me, is the equivalent of the duet of the spermiducal gland in 

 some other Acanthodriloid types where the duct is not dis- 

 tinguished by its nacreous glitter — for example, in Octojhcctus 

 Beatrix, just described. 



The penial seta3 of this BenJiamin are extraordinarily Ion"- 

 and are present to the number of four only, i. e. one to each 

 Sj)ermiducal gland, as I presume from the examination of one 

 penial seta-^ac. The sac is very conspicuous and presents 

 the appearance of a strap-shaped muscle lying in a straio-Iit 

 couise among the coils of the spermiducal gland. The seta 

 itself is curved, and measured in a straight line from one eml 

 of the curve to the other 5 millim. I calculate, therefore, that 

 the actual length of the seta, when straightened out, is abjut 



