28 MR. TEMPLETON ON SOME INVERTEBRATED ANIMALS 
substance of the coral, as becomes at once apparent when the attempt is made to re- 
move the animal, the least touch breaking sharp off the exterior tube. When anything 
disturbs it, it immediately retires within the cell, the long tentacula being in many in- 
stances placed also within, along the side of the animal, but most usually permitted to 
float about in the water. When it comes out from the tube, it does not project further 
than about the fourth or fifth foot: it then swings itself from side to side, tossing the 
tentacula about ; and whenever anything is discovered suitable for its food, the tentacula 
seize on it, as the Sapajous grasp an object with their prehensile tails, and it is then 
carried to the mouth, and is swallowed or rejected as the case may be. The tentacula 
have a vast number of annuli, and in their interior is discovered a tube in which oval 
globules are distinctly seen moving to and fro, as the motions of the tentacula affect a 
few adjoining joints. 
Genus PiraATESA. 
Os tentaculis seu branchiis numerosis, longé ciliatis, subulatis, simplici serie dispositis 
cinctum. 
Testa cylindrica, calcarea, erecta, e saxo parum prominente. 
Oss. Genus propter tentaculorum branchiferorum dispositionem a Sabella, Cuv., sejun- 
gendum. 
Mouth simple, at the summit of a gentle elevation: oral disc with numerous ciliated 
tentacula. Beneath slightly contracted, so as to form a neck capable of being received 
within the first ring of the body. Body sharply annulated, the rings bearing each a flat 
spined pedicle or foot, that proceeding from the second ring being the largest : the last 
ring, forming the tail, very small and with three pedicles or feet, two lateral and one 
dorsal. 
Forming a calcareous tube projecting a little way from the surface of the coral rock. 
PiRATESA NIGRO-ANNULATA. 
Tab. V. Figg. 15—18. 
Pir. brunnea, tentaculis pallidioribus nigro confertim interrupté annulatis. 
Near Black River, Mauritius, in the coral rock within the reefs. 
Not being able to find any genus exactly suited for the reception of this little animal, 
I have, with a considerable feeling of doubt, created one for it. The orifice of the mouth 
is simply a round opening in the centre of the oral disc, with the edge a little elevated and 
lined with a flocculent membrane which is thrown into folds, and continues of the same 
