. Bulletin - United States National Museum. Science. ISOPODS OF NOKTH AMERICA. 169 Parasites of skate, cod. and halibut; on Gadus ogac,' on Myxo- cephahis scorpius' on Soiiinlosuti inlcrocepJidhix; on Gach(f< caUarias. Body ovate, a little more than one and a half times longer than broad, 10 mm : K! nnn. Head two and a half times broader than long, 2 mm : 5 nun. Ante- rior margin widely rounded, and produced in a small median point, which does not arch over the antennae to meet the frontal lamina on the other side. Eyes large, oval, composite, occupying a largt; part of the dorsal surface o
. Bulletin - United States National Museum. Science. ISOPODS OF NOKTH AMERICA. 169 Parasites of skate, cod. and halibut; on Gadus ogac,' on Myxo- cephahis scorpius' on Soiiinlosuti inlcrocepJidhix; on Gach(f< caUarias. Body ovate, a little more than one and a half times longer than broad, 10 mm : K! nnn. Head two and a half times broader than long, 2 mm : 5 nun. Ante- rior margin widely rounded, and produced in a small median point, which does not arch over the antennae to meet the frontal lamina on the other side. Eyes large, oval, composite, occupying a largt; part of the dorsal surface of the head, but not contiguous, although very close together. The first pair of antenna? have the lirst two articles very much enlarged; the lirst article is wider and longer than the second; the second is produced at the upper distal angle in a process which extends half the length of the third article; the third article is very narrow, half as wide as the second article. The Hagellum is composed of fourteen articles. The tirst antennge extend to the end of the peduncle of the second pair of an- tenna?. The first three articles of the second antennae are subequal; the fourth and fifth are a])Out equal in length, and each twice as long as the third. The flagellum is composed of fifteen articles. The second pair of antenna^ extend a little beyond the posterior margin of the first thoracic segment. The frontal lamina is large, with base somewhat quadrate in shape, with rounded angles, and ven- trally placed, not dii-ected anteriorly. The maxilliped has a palp of five articles. The first three segments of the thorax are longer than the three following. The seventh is very short, being only less than half as wide as the sixth. The epimera of all the segments are distinct with the exception of the first. They are narrow i)lates with the posterior angles produced in the last four, although in the epimeron of the fourth segment, the posterior angle is rounded. On all the epimera there
Size: 1532px × 1632px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
