Archive image from page 106 of Decapod crustaceans of the northwest. Decapod crustaceans of the northwest coast of North America .. decapodcrustacea00rath Year: 1904 DECAPODS 97 Owen, the rostrum is longer and narrower than in S. affiiiis, extending to the extremity of the superior antennae; the dental formula was the same, -/, in the 3 specimens preserved. According to Owen's figure, the antennular peduncle extends about to the middle of the rostrum, the second and third segments are subequal, the thickened portion of the outer ilagellum is shorter than the peduncle. The rostrum curves stro
Archive image from page 106 of Decapod crustaceans of the northwest. Decapod crustaceans of the northwest coast of North America .. decapodcrustacea00rath Year: 1904 DECAPODS 97 Owen, the rostrum is longer and narrower than in S. affiiiis, extending to the extremity of the superior antennae; the dental formula was the same, -/, in the 3 specimens preserved. According to Owen's figure, the antennular peduncle extends about to the middle of the rostrum, the second and third segments are subequal, the thickened portion of the outer ilagellum is shorter than the peduncle. The rostrum curves strongly upward in its anterior half. SPIRONTOCARIS BIUNGUIS Rathbun. Spirontocaris biiaiguis Rathbun, Proc. U. S. Nat. Mus., xxiv, 899, 1902. This species of the gaimardii group is an inhabitant of deeper water, and is distinguished by its larger eyes, longer rostrum, subchelate dactyli, and by having an exopod and an epipod on the outer maxilliped, while the pereiopods are destitute of epipods. Carapace carinated on its anterior half or two thirds. Rostrum from one and a fourth to one and two thirds times as long as remainder of cara- pace, its poste- rior half or third gradually as- cending, the re- mainder more abruptly so; up- per limb narrow, the widest point in front of the eye; lower limb a little wider than the upper; terminal third a slender sharp spine, not limbed; dorsal spines 5 to 7 (two on carapace), ventral spines 4 to 7. Antennal spine strong; pterygostomian spine or tooth very small. Eyes very large and oblique, pyriform, the cornea covering the greater part of the peduncle. Antennular peduncle extending a httle past the middle of the antennal scale; second joint three times as long as third; outer scale reaching to end of first segment; thickened portion of outer flagellum extending in the female one third, in the male two thirds of its length beyond antennal scale. This last is four fifths as long as carapace; antennal peduncle reaching end of second segment of
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