. Zoology for high schools and colleges. Zoology. Fig. 228.—Pupa of Lepas, much en- larged.—After Darwin. Pig. 227 ^Nauplius of Balanue bal- arvoidtt, much enlarged. common barnacle {Balanus balanoides) attains its full size, after becoming fixed, in one season, i. e., between the first of April and November. Still lower than the genu- ine barnacles are the root-bar- nacles or RMzocephala, repre- sented by Peltogaster (Fig. 339) and Sacculina (Pig. 230), in which the joung is a more simple Nauplius form, like the young of the Entomostra- ca, while the adult is a sim- ple sac, containing no dig
. Zoology for high schools and colleges. Zoology. Fig. 228.—Pupa of Lepas, much en- larged.—After Darwin. Pig. 227 ^Nauplius of Balanue bal- arvoidtt, much enlarged. common barnacle {Balanus balanoides) attains its full size, after becoming fixed, in one season, i. e., between the first of April and November. Still lower than the genu- ine barnacles are the root-bar- nacles or RMzocephala, repre- sented by Peltogaster (Fig. 339) and Sacculina (Pig. 230), in which the joung is a more simple Nauplius form, like the young of the Entomostra- ca, while the adult is a sim- ple sac, containing no diges- tive organs or nerves. From the feet of the young grow out, after the animal becomes sessile, long root-like fila- ments, which ramify in the body of the crab, to which these animals are firmly an- chored. We can conceive of no lower, more degraded Crus- tacean than these root-barna- cIps, the only signs of life being the powerful contractions of the roots and an alternate expansion and contraction of. Fie. 229. — Peltogaster curvafus, en- l»ro;ed li times, beneatli the larva or Nau- pliiiB of Parthenopea, enlarged about 2Q0 times.—From Brenm'a Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Packard, A. S. (Alpheus Spring), 1839-1905. New York, H. Holt and Company
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectzoology
