. Alaska. Natural history -- Alaska; Scientific expeditions; Alaska. ISOPODS 217 filiform, the thoracic segments subquadrate, head quadrate. He refers to the hnear post-abdomen, which is truncated at the apex, three- jointed, and marked on either side with a suture. The antenna are described as being a httle shorter than half the body, with a ten- to twelve-jointed flagellum. No figure of the form has ever been given. A species of Idotca was sent to the U. S. National Museum by Dr. Ritter. The specimens, which are eight in number, were collected by him at Bolinas, California. They are more clo
. Alaska. Natural history -- Alaska; Scientific expeditions; Alaska. ISOPODS 217 filiform, the thoracic segments subquadrate, head quadrate. He refers to the hnear post-abdomen, which is truncated at the apex, three- jointed, and marked on either side with a suture. The antenna are described as being a httle shorter than half the body, with a ten- to twelve-jointed flagellum. No figure of the form has ever been given. A species of Idotca was sent to the U. S. National Museum by Dr. Ritter. The specimens, which are eight in number, were collected by him at Bolinas, California. They are more closely allied to /. gmcillima than to any other known species of Idotea from the Pacific coast of North America. Until evidence can be given of their distinctness, I shall con- sider them identical with /. gracillima (Dana). Body slender, about seven times longer than wide,^ with the sides nearly parallel. Surface entirely smooth. Color in alcohol uniformly pinkish. A note referring to the color of the specimens in life states that they are green, brown, and striped. Head quadrate, with rounded antero-lateral margins, and a slight median excavation in the anterior margin. Eyes situated at the extreme lateral edge and about the middle of the head; they are small but distinct. The first pair of antennae are four-jointed, and extend a little beyond the extremity of the second peduncular joint of the second pair of antennae. The second pair of an- tennae are equal to half the length of the body; the last two joints of the peduncle are subequal; in the smaller specimens the flagellum is composed of ten joints; in the larger ones there are eighteen joints. The first thoracic segment is short in the middle but is produced antero-later- ally on either side; it is not wider than the head. The second, third, and fourth segments are subequal in length and are ^'^•97- idotea gracinhna (V>zn^) {y^ i). longer than the first segment. The fifth, sixth, and seventh segments gradually decreas
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