Xeinalocie Genus T;iiii|:i;i, /\. Bl in 'liar<l. 22'l 



ty[)e-spccies, in which the oesophagus is about twice iis Ion;;, 

 bi'iiiu^ soinetiuies as much as \ (or even more, acconling to 

 voii Liiistow), and never less tiian }, of the total length. 



Tlie tail of the male (fig. -l) is 0"G mm. long, or about ^^ of 

 the total length. Tiiere is a considerable lateral ex|)ansion 

 of the cuticle, forming a bursal ala on either side, so tiiat the 

 outline of the tail is somewhat like an arrow-head with 

 rounded barbs. The two 3|jiculcs measui-e I'i mm. in length 

 (or I'l mm. in a straight line from base to ti|)). Tiiey are 

 covered with minute spinelets, as in t!ie preceding species. 

 The papilhe are arranged i)recisely as in T. tiara., and are 

 present to the same number (eight pcdrs). The only im- 

 portant dilFerence observed is that the second [)ostanal pair 

 (/. e., the second from the extremity of the tail) lack the large 

 swelling, or exhibit it in a much less cons[)icuous degree. 



In the female the tail measures 0"G5 mm. in length, or 

 about 2^ of the total length. It tapers rapidly from the 

 anus, and ends in a sharp point. The vulva is situated con- 

 siderably further forward than in the type-species, and is 

 within the middle third of the body ; in a mature example it 

 opens at 11'5 mm. from the posterior end, thus dividing the 

 body in the proportion of 33 : 23. The vagina is short. 

 One branch of the uterus, with its ovary, lies anteriorly to it, 

 the other posteriorly. The eggs are similar to those of 

 T. tiaru in shape, measuring 60 /x in length and •J:2'5 fi in 

 breadth. 



3. Tanqua anom.ila (v. Linst.). 

 HeteraJcis anomala, \on Linstow, 1904, p. 97 ; PI. i. figs. 10, 11. 



Under this name, in the same paper with T. [Cteno. 

 cephalufi] tiara, von Linstow has described a form from the 

 stomach of Tropidonotus piscator in Ceylon, which appears 

 almost certainly to belong to the genus under consideration, 

 and not to lleterakis. There are certain a[)parent dis- 

 crepancies, which might, perhaps, be removed or explained 

 by a re-examination of the material. Tlius the li[)s are 

 described as being three, instead of two, in number, and there 

 is said to be a peculiar preanal sucker-like organ in the male, 

 " beset with eigiit roundish projections, of wiiich the cuticle 

 shows pore canals." But in all other respects the species 

 seems to agree very well with the two forms already con- 

 sidered in this paper. The tigiires given by von Linstow at 

 once suggest Tanqua, on account of (1) the general shape of 

 the head, and the ()resonce of striated cuticular swellings at 

 its base; (2) the characteristic shape of some of the caudal 

 papilhe uf the male; and (3) the equal length and ^i>iny or 



Ann. tO Mag. N. Hist. Ser. 8. Vol. xvii. Iti 



