CESTODE AND NEMATODE PARASITES. 65 



The most conspicuous feature of these large proglottides is the cirrus bulb and the 

 cirrus. The former is conspicuous and median, the latter is in all cases we have 

 examined protruded in the last two proglottides, but most fully in the last. The 

 cirrus is a pleurecbolic introvert, and for one portion, and one portion only, it is 

 covered by a broad band of bristles or minute chitinous teeth or rods. Traces 

 of vitellaria and testes can also be made out. The genital openings are lateral and 

 alternating. 



Unfortunately we had only two or three specimens at our disposal, and it was not 

 advisable to cut any of them into sections, so that our knowledge of the minute 

 anatomy is still to seek. 



The peculiarities of this Cestode are so marked that it deserves to be recognised 

 as at least a new genus, if not as a representative of a new family. Until we know 

 more of its anatomy it is probably wiser to confine ourselves to the establishment of 

 a new genus, and we suggest the name Eniochobothrium, in view of the Cestode's 

 many-caped-coachman-like appearance. 



Habitat : From the intestine of a Rhinoptera iavanica, MULLER and HENLE, 

 taken off Dutch Bay, Ceylon, on January 10, 1905. 



Tetrarhynchus unionifactor, SHIPLEY and HORNELL. Plate IV., figs. 63 and 64. 



These specimens were taken from the intestine of Rhinoptera javanica, MULL, and 

 HENLE, captured in Dutch Bay. They are described as existing in swarms in the 

 stomach, especially at the pyloric end. Very few were found in the spiral intestine. 

 They occurred in all the specimens of Rhinoptera javanica captured. The longest was 

 3 centims., the other two were about half that length ; but Mr. HORNELL states that 

 when alive they can extend themselves to 4 or 5 inches. The head and body are 

 stout, averaging a little under a millimetre in diameter ; the proboscides are very small 

 and fine, and are invisible to the naked eye. They arise apically, close together at the 

 anterior surface of the head, and are supported by two shallow cephalic suckers or 

 bothridia on each side which meet anteriorly. The neck extends for 1*5 millims. to 

 2 millims., and contains the four clearly-marked proboscis sheaths and four tubules 

 proceeding from them enclosing the retractor muscles of the proboscides ; these are 

 very convoluted. The proglottides are at first broad and shallow, but they soon 

 lengthen, and in the middle of the body they are cylindrical, three times as long as 

 broad and circular in transverse section ; their posterior border just overlaps the 

 succeeding segments, but only just. Posteriorly the proglottides lose their shape, 

 become baggy, and develop a purplish-brown colour, and here they are 2 millims. in 

 length and rather over 1 millim. in breadth. 



The genital openings are irregularly alternate, there being perhaps two pores on the 

 right side, succeeded by two on the left, then one on the right, and so on. 



The anterior proglottides are very shallow, and lie one upon another like a series of 



K 



