. 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. 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
