176 Records of the Indian Museum. [Vol. X, 



The single testis commences 'j mm. from the anterior ex- 

 tremity and measures •5 mm. in length. It is followed by the 

 seminal vesicle '185 mm. long which ends at the base of the left 

 spicule and by a ductus ejaculatorius measuring '481 mm. 



Systematic Position. — The two specimens agree with Spiroptera 

 denticulata, R., as described by Schneider (19) except (i) in size — 

 (being only ^th of the length of 5. denticulata), (2) in the number 

 of spines on each ring — 5. denticulata bears 56 per ring on the 

 head, (3) the bursal edges are shown as cushion-like in 5. denti- 

 culata by Schneider, whereas they appear sharp in the variety. 

 Schneider does not refer to the remarkable left spiculum. 



6. Atractis kachugae, n. sp. 

 (PI. xxi, figs. 44-47. PI. xxii, figs. 48-49.) 



A large number of small organisms found in the intestine of 

 Kachuga lineata, Gray : Lucknow. They were so abundant that the 

 water used for washing the intestine appeared to swarm like a 

 magnified bacterial culture. 



The specimens vary in degree of maturity, some possessing 

 merely the rudiments of sexual organs, such as specimen 41/1 i, 

 others, such as 41/1/3, possessing fully developed sexual organs,^ 

 others, such as 41/4/-, containing larvae in utero. 



For measurements see table VI, page 189). It will be observed 

 that they are fine and delicate organisms, the maximum breadth 

 not exceeding 2*4% of T.L. The head is truncated, the maximal 

 breadth lies at the end of the oesophagus at 20% of T.L. (except 

 when the body is distended by larvse). The tail is long and fine. 



The head bears a circle of six lips— two lateral with simple 

 peg-like pulpa and four submedian which possess a pulpa of a 

 curious cross-like figure springing from a thick pedestal. The 

 form of these lips is best appreciated by referring to fig. 44. 



Lateral membranes (fig. 45) measuring "0085 mm in depth 

 run from the level of the 2nd bulb to behind the anus. A fine 

 cuticular transverse ringing is visible on some specimens only and 

 is probably artificial. The vulva is a transverse slit with slightl}^ 

 prominent lips "102 mm. in front of the anus. 



The anus is not prominent. 



Genital papillae in the male. Two pairs of simple papillae 

 preanal and one postanal (fig. 47). The tail of the male is curved 

 to a right angle with the rest of the body at the anus (fig. 49). 



Internal organisation. — Alimentai*}' canal. The anterior end 

 of the oesophagus is square and lies at the level of the bases of 

 the lips. The anterior portion of the body of this organ, "005 mm. 

 in length, is marked off by a ring of vacuoles between the muscle 

 fibres. The remainder is again divided into two portions, each 

 portion terminated by a bulb. The anterior portion shows definite 

 muscular striation, the posterior is granular in appearance. The 

 anterior bulb is fusiform, the posterior pear-shaped, and the 



