610 Transactions of the Society. 



Callidina perforata sp. n., plate XIX. figs. 11« to lie. 



Specific characters. — Small, food moulded into pellets, inhabit- 

 ing case secreted from the skin ; case brown, shortly oval, with 

 short neck and slightly expanded mouth, drawn out at posterior 

 end into a short tube, which is bent towards the dorsal side, 

 perforated at the tip, which has two pointed lips, like the spout of 

 a tea-pot. Xeck long, lower lip a small spout, disks strongly 

 inclined back, rostrum short, antenna equal 3, 5 of neck, gullet 

 short : teeth 5 5 or -4 1. trunk dorsally plicate, egg elliptical. 



Haying some affinity with C. angustieollis, it yet differs in 

 almost every part of its organisation. The remarkable case is 

 quite unique. It fits so closely to the trunk that the plica? are 

 seen even in the empty case. It is very remarkable that the open 

 tube at the posterior end is turned to the dorsal side, as the foot 

 of all Bdelloids is turned to the ventral side. This is opposed to 

 the idea that the perforation is for the protrusion of the toes, and 

 gives colour to the suggestion of Mr. Bryce. that it serves solely to 

 get rid of the voided pellets. There is a trace of lamination at 

 the neck of the case. Empty cases usually lack the ventral wall 

 of the trunk. The gullet is unusually short for a pellet-maker, so 

 that, when feeding, the jaws are well out of the case, while in 

 C. angustieollis they always remain in the central trunk. 



Abundant in several collections from different elevations in the 

 Himalaya, Darjiling 6000 ft., Sukvar 4000 ft.. Singla 2000 ft. 



Callielina angustieollis Murray, var. attenuate' var. n., 

 plate XIX. fig. 9. 



Distinctive characters. — Animal of same size as type, but case 

 greatly elongate at the neck, so that when feeding the head only 

 is exserted. 



C. angustieollis. type (fig. 10), when feeding, has the head far 

 out of the case, the greater part of the neck also showing outside, 

 the case in fact ceasing at the base of the neck. In the variety 

 attcnuata, though the neck is no longer, the case extends two 



EXPLANATION OF PLATE XIX. 



Fig. 6a. — Callidina crenata var. nodosa. 

 „ 6b. „ ,, Jaw. 



,, 6c. ,, „ Lateral view of foot. 



,, la. — Rotifer longirostris Janson var. rimbriata. 

 „ 76. ,, „ ,, „ Section of neck. 



ii 7c „ „ „ „ Antenna. 



„ 8. „ „ ,, Spurs of variety. 



„ 9. — Callidina angustieollis var. attenuata. 

 „ 10. „ „ „ Type. 



,, 11a. „ perforata sp. n. Case in dorsal view. 



„ 116. „ ,, Lateral view of case. 



!> He. „ „ Jaw. 



