378 MR JAMES MURRAY ON A NEW FAMILY 
Callidina crucicorms, n. sp. (Plate V. figs. 8a to 8g.) 
Specific characters.—Large, slender, elongate. Rostrum very long, of two con- 
spicuous joints, with very large, spreading lamellz. Antenna very small. Brain large ; 
no eyes. Jaws relatively very small; dental formula, 2/2. Stomach voluminous; food — 
not moulded into pellets. Foot short, of three joints, very prominent dorsal boss on — 
first joint. Spurs long, tapering, with distinct shoulder on inner side at base, capable 
of being brought together at the points or crossed over one another. Last joint of 
foot long, with three very large toes. 
General descruption.—Greatest length 35 to gy inch. Every part elongate except 
the foot. Colour dull yellow or greyish. Longitudinal plicee few, fainter on back. 
Salivary glands well developed, one long narrow pair extending beyond the mastax to 
the upper part of the stomach. Walls of stomach thick, filled with larger and smaller 
dark yellow globules. Intestine oval, its long axis transverse, partly covered in dorsal 
view by stomach. Yolk-mass large, with eight small nuclei. Space between spurs 
straight or convex, according to position of spurs. Terminal toes long, slender, two- 
jointed. Dorsal toe as long as the others, but usually extended to only half the length. 
Foot-boss pointing backwards. 
Owing to its disinclination to feed, the description cannot be completed. In the 
retracted state the discs are large and elongate. The species has a_ superficial 
resemblance to Callidina longirostris in the long rostrum and spurs, and also to 
Philodina macrostyla and its allies. It is believed to have no close affinity with any 
of those species, all of which are viviparous, while this is oviparous. The rostrum — 
tapers gradually from the oral segment, and is not abruptly narrowed as in CL 
longirostris. 
Habits.—Although it has been known for more than two years, and has been under 
constant observation for nearly one year, and thousands of examples have been carefully 
studied by three or four observers, little is known of its habits, as it has never once 
been seen to feed. It creeps slowly and deliberately, examining everything it 
encounters with its rostrum, which appears to be a very delicate organ of touch. It is 
very mobile, and can be bent backwards and forwards and from side to side. The 
lamellee, which are only inferior in size to those of C. cornigera, are waved about in 
the way characteristic of that species, and which has led to the supposition that they 
are organs of smell. ; 
When washed out of the mosses among which it lives, and allowed time to settle 
down among the sediment, it is found that it takes up its position, not on the surface 
of the sediment, but a little way down in it. The stomach is often seen to be well 
filled with food. These facts, together with its disinclination to feed, lead me to 
suppose that it may have an aversion to light, and will not feed unless in darkness 
If this is so, it may be impossible to complete the description of the head. Against the 
