. Quarterly journal of microscopical science. shorter than the base of the exopodite. Secondmaxillipedes with a rudimentary epipodite, but without anybranchiae. Third maxillipedes with reduced epipodite, dilatedand articulated at its base, with the mesopodite standing-forward and carrying the carpus on its internal face. Asingle pleurobranch : three pairs of swimmerets in the The antenna? cannot conceal themselves completelybeneath the rostrum (in Cymopolus they can). Species 1.—C. quadratus, A. Milne-Edwards. Bull. Zool., vol. viii, No. 1, p. 26 (1880). The characters
. Quarterly journal of microscopical science. shorter than the base of the exopodite. Secondmaxillipedes with a rudimentary epipodite, but without anybranchiae. Third maxillipedes with reduced epipodite, dilatedand articulated at its base, with the mesopodite standing-forward and carrying the carpus on its internal face. Asingle pleurobranch : three pairs of swimmerets in the The antenna? cannot conceal themselves completelybeneath the rostrum (in Cymopolus they can). Species 1.—C. quadratus, A. Milne-Edwards. Bull. Zool., vol. viii, No. 1, p. 26 (1880). The characters which distinguish this species from are stated by M. and Bouvier asfollows: 1. All the parts of the body are less granular and much 454 E. RAY LANK ESTER. less riclily furnislied with hairs; these hitter notably are notpresent on the dorsal face of the carapace. 2. The cervical groove is much more marked iu C. quad-ratus, but the branchial region is less so, and in fact presentsno distinct limit anteriorly. 4 \ , Fig. 10.—Outline diagrams of the anterior margin of the carapace,the rostrum, and ocular peduncles of two specimens of Cymo-nomus quadratus, The upper figure is taken fromM. Milne-Edwards figure in ihe Travailleur volume, and thelower is drawn from a specimen kindly communicated by Both figures show the peculiar form of the ocukrpeduncles, e, differing both from tiiose of C. granulatus and ; also the proportionate size of the rostrum, r. Thelower figure shows a greater size attained by the extra-orbitalspines, sp, and a rounding off of the lateral angles of the carapace,as compared with tiie type. 3. The rostral region^ is less pronounced, and advancesless distinctly in front of the carapace; the rostrum is muchnarrower, and has no denticles on its margins. 4. The ocular peduncles ai-e much more delicate, and arcgradually attenuated from the base to the summit; their See our text block, Fig. 10, r, and compare
Size: 1437px × 1738px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1850, bookpublisherlondo, bookyear1853
