320 



Memoirs of the Indian Museum. 



[Vol. VII, 



-n.r. 



wards the ventral surface, as described by Seurat (1919), for Echinuria, Soloviev, 

 1912, and there are no cnticular spines. The cervical papillae are prominent and 



slender and are situated a little behind the lateral bends 

 of the cordons. 



The head is small and provided with two simple lips, 

 and is not constricted off from the body. The oesophagus 

 consists of the usual three portions, a pharynx, a muscular 

 portion, and a glandular portion. These measure 0*31, 

 0*41, and 23 mm. respectively. The nerve-ring surrounds 

 the oesophagus at about 0*27 mm. from the anterior 

 extremity, while the excretory pore opens at about 054 

 mm. from the head. The vulva opens at about 0*17 mm. 

 from the tip of the tail. Its anterior lip is modified into a 

 prominent bulla. From the vulva there is a long, straight, 

 muscular-walled vagina which runs forward for about 1*4 

 mm. and then turns transversely to join the uterus. The 

 species may be considered to be monodelphic, the posterior 

 set of organs being represented merely by a blind sac-like 

 uterus which runs back to the vicinity of the vulva. The 

 anterior uterus runs forward to within 175 mm. of the an- 

 terior end of the body, the ovary commencing at this point 

 and running backwards. In a mature specimen practically 

 the whole of the body-cavity is occupied by the uterus, 

 which is packed with eggs containing fully-developed em- 

 bryos. The ova measure o - 028xo*oi8 mm. The anus is 

 situated at 0*05 mm. from the tip of the tail. 



The tail of the male forms several turns of a spiral. 

 Membranous alae are present, extending for about 0*7 mm. 

 from the tip of the tail. The cloaca opens at 0-115 mm - 

 from the tip of the tail. There are nine pairs of supporting papillae in the 

 alae; 4 preanal pairs, about equidistant from each other and close to the cloaca, and 

 5 postanal. The postanal papillae are arranged as follows : four pairs in a group, 

 occupying the posterior half of the tail, and one pair about midway between this 

 group and the anus. The papillae are all stalked and slender, the preanal ones being 

 much longer than the postanal. The spicules are unequal and dissimilar. The right 

 spicule is long and slender. It is gently curved, and if partly extruded the distal 

 portion may be generously incurved but it is not twisted. It measures 0'65-o - 675 mm. 

 The left spicule (fig. 56), is short and very much curved. It lies roughly at right 

 angles to the long axis of the right spicule, measures o - iC)-o - 2i mm. in length, and 

 is twisted and flanged. The root of the spicule is expanded. Its edges are faintly 

 serrated in the part towards the tip. The testicular coil runs forward to within 3*5 

 mm. from the head. 



A genus Echinuria (genotj'pe E. jugadornata) was erected by Soloviev in 1912, the month of publi- 



oes.3. 



Fig. 55. — Acuaria (Echinu- 

 ria) leptoptili. Anterior end 

 of female; lateral view. 



c, cordon ; e., excretory 

 pore ; n.r., nerve-ring oes.l., 

 oes.2., oes.3., three divisions of 

 oesophagus. 



