374 MR JAMES MURRAY ON A NEW FAMILY 
‘allidina angusticollis, n. sp. (Pl. III. figs. 2a to 2k.) 
Specific characters.—Small, colourless; form pitcher-shaped in lateral view, the 
lower lip large, elevated, spout-like. Discs small, close together, inclined obliquely 
towards the mouth. Oral segment elongate, encircled about midway by a series of four 
thickenings. Food moulded into pellets. Foot minute, not obviously segmented ; 
spurs short, acute, decurved, meeting at base. Dental formula 2/2. Secretes a brown 
flask-shaped protective case. 
General description.— Greatest length 5!5 to ~}» inch when feeding. Head laterally 
compressed, elongate from front to back. Discs sloping downward and outward from 
middle line as well as forward towards the mouth. Lower lip larger, relatively to the 
size of the animal, than in any other species known. ‘Thickenings on oral segment 
diagonally placed, as shown in section, fig. 2e. Rostrum of moderate length, with 
fairly large lamelle. Antenna of two joints, length equal to diameter of neck. 
Neck with large rounded thickenings at each side of antenna, and ventral thickening. 
Neck very long and slender. Gullet correspondingly elongated. Stomach voluminous, 
filled with round, clearly-outlined pellets of uniform size. These are coherent, and do 
not disintegrate in their passage through the alimentary canal. They are voided whole. 
No eyes. Reproduction oviparous. Case oval, slightly flattened on ventral side, 
pale yellow when young, dark brown when old. Neck of case long, with annular strie, 
g, 
mouth slightly expanded. 
The foot, being apparently useless inside the case, which the animal never seems to 
leave, is very small. It can only be seen when the animal is forced out of its case. 
No separation of the first and second joints can be distinguished. The rudiments of 
toes probably exist, as the spur-bearing joint is not closed at its lower end, but they 
were not seen. 
Habits.—Trusting apparently to the protection afforded by its shell, it is not at all 
shy, and usually resumes feeding very soon after being disturbed. When feeding, the 
neck is bent backward. Before beginning to feed, the head is often put out and the neck 
bent sharply over the edge of the case till the rostrum touches the outside of the case. 
The case is believed to be secreted from the skin, but the process has not been observed. 
‘The animal may occupy empty (or even inhabited) shells of Rhizopods, such as Difflugia 
or Nebela. Careful examination has always revealed a normal ease inside the shell thus 
occupied. On one occasion the Callidina was seen in a shell of Dufflugia which was 
shorter than its case. The projecting neck of the case was viscous, as shown by 
adherent matter, and nearly colourless. It had probably been just completed. Old 
animals show no viscosity, either of skin or case. The case is thin, smooth, and brown, 
and does not adhere to the animal. It is a cleanly animal. The pellets, which at first 
contain the food, are eventually passed out as clear spheres. After voiding them it 
clears them out by fully contracting its body and rolling about from side to side of the 
case till they are forced out through the neck. 
