NEW SPECIES OF PEMCH^TA. 



215 



into the cavity of the " atrium " (text-fig. 4) ; but, so far as I 

 have been able to make out, the protrusion of the penis is 

 effected in a manner different from that in P. Arturi. I find no 

 narrov^r duct, capable of being unwound in eversion, and I conclude 

 that the sac itself must be everted, as in Sudrilus, so that the 

 penis is carried outwards with it. 



Fig. 4. 



P. malamaniensis. — A diagram of about a third of a transverse section through 

 the body, at the level of the male pore. a. Sperm-duct : on the right it is 

 cut through as it passes from the body-VFall to the penis, which it traverses 

 to the tip {cf. text-fig. 3). b. The spermiducal gland. c. Its duct. 

 d. Muscular penial duct, outside the muscular sac. d' . The continuation 

 of this as a narrow, tubular, protrusible penis, e. Atrium, or cavity of the 

 muscular part (middle region) of the glandulo-muscular sac {cf. PI. 16. 

 fig. 6 a). /'. Its muscular wall. g. Peculiar muscular pad projecting into 

 the atrium, h. Body-wall. 



Mr. Beddard, in a recent paper (P. Z. S. 1896), has described 

 an arrangement of the sperm-ducts iu relation to the penial 

 duct of P. Perkinsi, which he rightly points out (p. 200) has 

 not hitherto been observed. From the observations which I 

 have made, I would suggest that the arrangement here is not so 

 unusual as our lack of information on the microscopical structure 

 of the worms inclines him to consider it to be ; for in both 

 the worms which I have recently examined I find essentially 



