. Alaska. Natural history -- Alaska; Scientific expeditions; Alaska. 23 RATHBUN HYMENODORA FRONTALIS Rathbun. Hymenodora frontalis Rathbun, Proc. U. S. Nat. Mus., xxiv, 904, 1902. Integument very thin, but firmer than in H. glacialis; covered with fine wrinkles or rugose lines. Carapace and rostrum more than half as long as abdomen; median carina extending almost or quite to the mid- dle of the carapace, and advanced in a rostrum which is unusually long for the genus, being from two fifths to one half as long as the remainder of the carapace, and reaching the end or a little beyond the end of
. Alaska. Natural history -- Alaska; Scientific expeditions; Alaska. 23 RATHBUN HYMENODORA FRONTALIS Rathbun. Hymenodora frontalis Rathbun, Proc. U. S. Nat. Mus., xxiv, 904, 1902. Integument very thin, but firmer than in H. glacialis; covered with fine wrinkles or rugose lines. Carapace and rostrum more than half as long as abdomen; median carina extending almost or quite to the mid- dle of the carapace, and advanced in a rostrum which is unusually long for the genus, being from two fifths to one half as long as the remainder of the carapace, and reaching the end or a little beyond the end of the antennular peduncle. The rostrum is a slender, sharp-pointed spine; distal half slightly curved upward and usually unarmed, basal half armed. Fig. 8. Hymenodora frontalis. ?(Xabout2). Station 3308. with from 3 to 6 small spines above, two or three of which are beyond the line of the orbit. Occasionally there is a single spine on the distal half. Orbit deep; a tiny spine tips the suborbital lobe. Antennal spine strong; from it a sharp carina runs back subparallel to the side margin quite to the posterior margin. Above this the branchial region bears a blunt ridge, chiefly longitudinal, but bent down at either end; a deep groove extends obliquely downward and backward from the orbital sinus nearly to the lower carina. The eyes reach to the middle of the basal segment of the antennulos; they are without pigment, and bear a slender, blunt spine close up to the cornea on the inner margin. The antennular peduncles are short, the segments diminishing successively in length; basal scale narrow-oval, as seen from above; upper flagellum very thick at base. Antennal scale lanceolate, outer margin nearly straight, tipped with a small spine; peduncle very stout, attaining the end of the first antennular 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 ma
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