'14 RECORDS OF THE AUSTRALIAN MUSEUM 



spherical and between each pair there is a deep narrow groove. 

 Situated on the outer and anterior edge of each there is a small 

 auricle, a muscular appendage characteristic of the genus 

 TetrabotJirius. 



Immediately behind the scolex there is a narrower unsegmented 

 neck region, which is soon followed by the segmented portion of 

 the strobila. The specimens do not allow of any further detail 

 being given except that the segments gradually increase in size 

 until the last few proglottids are reached, these being rather 

 longer and narrower than those further forward. Krefft gave 

 the length of the worm as being two and a half inches ( = about 

 52 mm.). He also stated that the segments were not provided 

 with " lemnisci," this implying that he did not see the cirrus. 

 The characters of the scolex resemble the figures given by 

 Monticelli 34 so closely that there is no doubt as to the identity 

 of the two parasites. The breadth is very much greater than 

 that given by Fuhrmann (028 mm.). The length according to 

 the latter may be from 25 to 65 mm. 



The following summary account of the anatomy is based 

 mainly on that given by this author. The longitudinal muscu- 

 lature consists of an inner series of bundles of fibres, each 

 bundle with from twelve to twenty fibres and an outer series in 

 which there are fewer (three to six) fibres in the individual 

 bundles. The transverse and dorso-ventral muscles are well 

 developed. There are no commissural vessels in the scolex 

 connecting the excretory canals of the one side with those of the 

 other. 



The genital atrium is narrow and deep, the cirrus sac opening 

 into it dorsally and the vagina ventrally. The male duct does 

 not open directly into the cloaca but first into a male canal which 

 connects with the latter. According to Monticelli's figure the 

 pores (which are situated on the right side) seem to be placed at 

 about the middle of the margin of the segments. 



The male organs consist of about twenty-two testes (instead of 

 from five to seven as mentioned and figured by Monticelli) 

 arranged around the female organs. The vas deferens after 

 being thrown into coils, passes out laterally to terminate in a 

 long cirrus lying in the muscular rounded cirrus sac which lias 

 a diameter of 0072 mm. This in turn leads into a short 

 male canal terminating in the genital cloaca dorsally to the 

 vagina. 



3t Monticelli — Loc. cit., figs. 4, 5, 8. 



