. The Cambridge natural history. Zoology. PAGURIDEA LITHODES MAIA 177 reduced and carried tightly Hexed on to the ventral surface of the thorax. They live a free, unprotected existence, and are highly calcified. They are, however, certainly Pagurids, as is evidenced by a number of anatomical characters, but most clearly by the asymmetry of the abdomen, especially in the female, which is not only markedly asymmetrical in the arrange- ment of its dorsal plates (Fig. 121), but also in the presence of. Fig. '[I'i.—Lithodes maia, ?, in ventral view, x \. The abdomen is flexed ou the thorax, so that
. The Cambridge natural history. Zoology. PAGURIDEA LITHODES MAIA 177 reduced and carried tightly Hexed on to the ventral surface of the thorax. They live a free, unprotected existence, and are highly calcified. They are, however, certainly Pagurids, as is evidenced by a number of anatomical characters, but most clearly by the asymmetry of the abdomen, especially in the female, which is not only markedly asymmetrical in the arrange- ment of its dorsal plates (Fig. 121), but also in the presence of. Fig. '[I'i.—Lithodes maia, ?, in ventral view, x \. The abdomen is flexed ou the thorax, so that its dorsal surface is seen. , Lateral plates of third alidoniiiial segment ; , left lateral plate of fifth abdominal segment ; m, marginal plate ; 7", brush-like last pereiopod ; , telson and sixth abdominal segment. ihicc plcopods Upon the left side only, as in Birgus. The male is witliout these appendages, and the sixth pair of pleopods is absent in both sexes. The remarkable calcified plates upon the abdomen bear a superficial resemblance to those in Birgus, but their evolution is traced, not from a Ccnobite, but from an Eupaguriue stock.' In some of the Eupagurinae, Pylopagurus, feebly calcified ])lates are present u])on the segments of the abdomen (Fig. 122, A). In the most primitive of the Lithodidae we witness the 1 Brandt, Bidl. Phys. Mutli. Acad. St. mersbounj, i. p. 171, and viii. p. 54 : Boas, A". JJansk. Vidcnsk. Selskab. Skrift. Naturvid. vfj Math. Afd. 6, Bd. 2, 1880 ; Bouvicr, Ann. Set. Nat. {Zool.) (7) xviii. p. 157. VOL. IV N. 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 Harmer, S. F. (Sidney Frederic), Sir, 1862-; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. London : Macmillan and Co. ; New York : The Macmillan Company
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