PEE 



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PER 



avY]p y a man, Gr.) A plant having 

 live stamens. 



PENTA'NDEIAN. Having five stamens. 



PENTAPHYLLOI'DAL. (from vevre, five, 

 <frv\\ov, a leaf, and e?e>os, resem- 

 blance, Gr.) Appearing to have 

 five leaves ; resembling five leaves. 

 The Placentae are all ornamented 

 with a pentaphylloidal flower. 



PENTELA'SMIS. (from TreVre, five, and 

 eXafffia, a plate, or layer, GF.) A 

 species of Anatifa, or of the Lepas 

 of Linnaeus. 



PE'NTEEMITES. An extinct genus of 

 fossil encrinites, established by 

 Say, of the order Blastoidea. 



PEPEBI'NO. The name given by 

 Italian geologists to a particular 

 form of volcanic tuff, composed of 

 basaltic scoria. 



PEEA'MELES. A genus of marsupiala. 

 The following description is from 

 Col. Mitchell's Australia. " The 

 most remarkable incident of this 

 day's journey was the discovery of 

 an animal, of which I had seen 

 only the head amongst the fossil 

 specimens of Wellington valley. 

 This animal was of the size of a 

 wild young rabbit, and of nearly 

 the same colour, having a broad 

 head, terminating in a long and very 

 slender snout, like the narrow neck 

 of a wide bottle ; and no tail. The 

 feet, and especially the fore legs, 

 were singularly formed, the latter 

 resembling those of a hog, and the 

 marsupial opening was down- 

 wards, and not upwards, as in the 

 kangaroo and others of that class 

 of animals." 



PEEE'NNIAL. fperennis, Lat. perenne, 

 It.) In botany, applied to plants 

 that live many years, bearing 

 flowers and fruit frequently. 



PEEFO'LIATE. In botany, applied to 

 leaves when the stem appears to 

 pass through their substance. The 

 common hare's-ear is an example. 



PE'RIANTH. (from Trepl, about, and 

 tti/009, a flower, Gr.) The calyx is 

 BO called when it is united with 



the corolla, so as to form only one 

 floral envelope. 



PEEICA'EDITJM. (from Trepl, round, 

 and Kap&a, the heart, Gr.pericarde, 

 Pr. pericardia, It.) The membrane 

 which envelopes the heart. 



PE'EICAEP. (from Trepl, round, and 

 KapTros, fruit, Gr. pericarpe, Fr.) 

 The ovarium, when ripened into 

 fruit, is called the pericarp; this 

 consists of three parts, which in 

 some fruits, as the peach and plum, 

 are easily separable. The outer 

 skin is called epicarp ; the fleshy 

 part, the sarocarp; the stone, or 

 shell, the endocarp. There are ten 

 different kinds of pericarps, namely, 

 drupe, pome, berry, follicle, silique, 

 silicle, legume, capsule, nut, and 

 strobile. 



PE'EICHLIN. A feldspathic mineral, 

 an albite, in which part of the soda 

 has been replaced by potash. 



PEKICLI'NITJM. The name given by 

 foreign botanists to a kind of 

 involucre. 



PE'EIDOT. The name given by Haiiy 

 to prismatic chrysolite. 



PEEIGE'E. (from Trepl, round, and <y, 

 the earth, Gr. perigee, Fr.) A 

 term used to denote that point 

 where the sun is nearest to the 

 earth. The perigee of the lunar 

 orbit is the point where the moon is 

 nearest to the earth. 



PEBI'GYNOUS. (from Trepl, about, and 

 ryvvjj, a woman, Gr.) Inserted 

 around the pistil. When the 

 stamens grow out of the corolla, 

 calyx, or perianth, or are not in any 

 way joined to the seed-vessel, they 

 are said to be perigynous. 



PEEIHE'LION. The point of an orbit 

 nearest to the sun. 



PEEISSODA'CTYLA. Odd-toed ; having 

 one or three toes. This order of 

 mammalia is divided into two 

 families, namely, Solipedia, com- 

 prising the horse, and Pachyder- 

 mata. 



PEEIO'STEUM. (from Trepl, around, 

 and eoTsov, a bone, Gr. perioste, Fr.) 



