File:Evolution and its relation to religious thought (1888) (14577185859).jpg

Identifier: evolutionitsrela00leco (find matches)
Title: Evolution and its relation to religious thought
Year: 1888 (1880s)
Authors: LeConte, Joseph, 1823-1901
Subjects: Evolution Religion and science
Publisher: New York, D. Appleton
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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ppendages (antennas). For example, in the abdomi-nal region, or so-called tail, we have seven segments,all being perfect movable rings, each with its pair ofjointed appendages, except the last, or telson. Theappendages of the first ring (Fig. 28, B) are speciallymodified in the male as organs of copulation (B). Thenext four pairs are modified for swimmerets (D) andfor use as holders of the eggs in the female. The ap-pendages of the sixth ring (G) are broad and paddle-shaped, and, together with the telson or seventh ring(H), form the powerful terminal swimmer. Going,now, to the cephalo-thorax : in this either a large num-ber of segments (thirteen or fourteen) are consolidatedabove to form the upper shell or carapace ; or else, asis more probable, two or three of the anterior seg-ments have enlarged and grown backward over, and atthe expense of the others, to form this shell. At anyrate, it is certain that the carapace is formed of thedorsal portions of a number of segments consolidated
Text Appearing After Image:
Fig. 28.—External anatomy of the lobster (after Kingsley). HOMOLOGIES OF THE ARTICULATE SKELETON. 119 together. Below,however, the seg-ments are all dis-tinct, and haveeach its own pairof appendages.For example, go-ing forward inthis region, thefive next -pnhs ofappendages aregreatly enlargedand very strong,and serve the pur-pose of locomo-tion. They areicalMng - append-ages. The nexttwo or three pairsare smaller andsomewhat modi-fied, but not somuch as to ob-scure their essen-tial similarity tolegs. Like legs,they are many-jointed, and likelegs, too, they

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