. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 531 The pleopoda are five pairs of large, ))road, smooth, leaf-like, double-branched appendages not cf)ncealed on the dorsal side by the small opimeral plates of the al)d()minal segments, from which they project in full view. The uropoda are a pair of single-branched, simple appendages, similar in shape to the branches of the pleopoda. The marsupium is formed of five pairs of incuba- tory lamella?, which overlap so as to completely encompass the ventral surface of the body; the first pair have the terminal lobe of t
. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 531 The pleopoda are five pairs of large, ))road, smooth, leaf-like, double-branched appendages not cf)ncealed on the dorsal side by the small opimeral plates of the al)d()minal segments, from which they project in full view. The uropoda are a pair of single-branched, simple appendages, similar in shape to the branches of the pleopoda. The marsupium is formed of five pairs of incuba- tory lamella?, which overlap so as to completely encompass the ventral surface of the body; the first pair have the terminal lobe of the distal segment small, but well defined. There are seven pairs of small legs, all similar in size and structure; a high triangularly shaped ex- pansion or carina is present on the basis. Color uniforndy light 3'ellow. Mal(% two and one-third times longer than broad, with all seven segments of the thorax and all six segments of the abdomen distinct. Eyes present. Abdomen occupies one-fourth of the entire length of the bod}'. Only one specimen was found at Ke}" West by Henry Hemphill Pai'asitic oa PHrolixtJies scj' (Gibbes). Ti/pe.—Cat. No. 29(>9i, Fig. 577.—Pseudione cuRTATA. Male, x 23. 88. Genus STEGOPHRYXUS Thompson.« Branchia 1 parasites. Female with the sixth segment of the thorax greatly longer than an}' of the other segments. Alxlomen with all six segments distinct; lateral parts or pleural lamelhv not developed. There are five pairs of tri-ramous pleopods. Uropoda consist of a pair of small, rounded, oval bodies, between which is a small conical process. Male with all the segments of the thorax distinct. Abdomen ovoid, without appendages or traces of segmentation. a See Thompson for characters of genus, Bull. U. S. Fish Comm., XXI, 1902, p. 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 r
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