. Zoology : for students and general readers . Zoology. Fig. S33.—Pupa of Lepas, mucli en- larged.—After Darwin. Fig. 232.—Nauplias of Salanus bal- anoides, mach 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 Rhizocejjhala, repre- sented by Peltogaster (Fig. 234) and Sacculina (Fig. 235), in which the young is a more simple NaupKus form, like the young of the Entomostra- ca, while the adult is a sim- ple sac, containing
. Zoology : for students and general readers . Zoology. Fig. S33.—Pupa of Lepas, mucli en- larged.—After Darwin. Fig. 232.—Nauplias of Salanus bal- anoides, mach 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 Rhizocejjhala, repre- sented by Peltogaster (Fig. 234) and Sacculina (Fig. 235), in which the young is a more simple NaupKus 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- cles, the only signs of life being the powerful contractions of the roots and an alternate expansion and contraction of. 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 : Henry Holt
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
