348 



NATURAL HISTORY OF 



perisarc, 28. 

 peristome, 273. 

 perigastric cavity, 207. 

 pharynx, 204. 

 phylogenetic, accompanying 



growth. 

 pliysa, ]77. 

 pinna, a short branch. 

 pinnate, bearing pinna3. 

 planula, a free-swimming larva. 

 plumose, feathery. 

 polypide, the alimentary zooids 



of the Hydroida. 

 poly2ntes, the alimentary zooids 



ot the Polyzoa. 

 polyp, the alimentary zooids of 



the Zoophytes in general. 

 polypary, 28. 

 poses, small openings. 

 prophyllactic, serving sanitary 



purposes. 

 proximal, the end farthest from 



the mouth. 

 pyloris, 205. 

 pyriform, pear-shaped. 

 puncture {?i&]. punctate), a small 



opening or depression. 



quincunx, arranged as at the 

 corners of a square, with one in 

 the centre. 



racJiis, 192. 



radiated, having radial lines. 



ramose, branched. 



reniform, kidney-shaped. 



reticulate, net-like. 



rhomhoidal, four-sided, with two 



acute and two obtuse angles. 

 rostrum, a projection in front of 



the orifice. 

 rugose, roughened. 



sarcotheca, 33. 



scapus, 177. 



septum, a dividing membrane. 



serrate, toothed. 



sessile,viit\io\xt footstalks or joints. 

 seta, a bristle. 

 setaceous, bristling. 

 sinuate, waved. 

 sinus, a notch. 

 somatic, 17. 



spathulate, spoon-shaped. 

 spherules, 165. 



sporosacs, sac-shaped gonophores. 

 statohlasts, 209. 

 stellate, star- shaped. 

 stolon, a creeping root. 

 striated, marked with fine lines. 

 sub' {in composition) = approach- 

 ing to. 



tactile, serving for purposes of 

 touch. 



tentacle, organs of touch or respi- 

 ration, or both. 



transverse, horizontal. 



trophosome, a hydroid colony. 



truncated, like a cone, with the 

 apex flattened. 



tuhercle, a knob or protuberance. 



tubular, hollow. 



umbo, a boss or knob. 

 umbrella, the swimming-bell of a 



medusa, 30. 

 7C)iilateral, one-sided. 

 uniserial, in a single row. 

 urceolate, pitcher-shaped. 



velum, 30. 



ventricose, swollen in the middle. 



verrticose, covered with tubercles. 



verticillate, whorled. 



vesicle, a little bladder. 



vibraculum, 209. 



zoarium, a colony of Polyzoa. 

 zooecium, 202. 



zooid, an alimentary or repro- 

 ductive Polyp. 



