Archive image from page 93 of Discovery reports (1932) Discovery reports discoveryreports05inst Year: 1932 84 DISCOVERY REPORTS Ampelisca statenensis, (Fig. 39). Occurrence: St. WS 88. Cape Horn. 1 ovig. ? 14 mm. Description. Body dorsally compressed, with a faint keel from head to pleon seg- ment 3. Head truncate, lower margin concave in front. Corneal lenses 4, the upper in upper angle of head, the lower on the lower margin. Postero-inferior angle of pleon segment 2 rounded, of 3 with a small point; segment 4 with a high, bluntly rounded dorsal keel. Antenna 1 extending to end of
Archive image from page 93 of Discovery reports (1932) Discovery reports discoveryreports05inst Year: 1932 84 DISCOVERY REPORTS Ampelisca statenensis, (Fig. 39). Occurrence: St. WS 88. Cape Horn. 1 ovig. ? 14 mm. Description. Body dorsally compressed, with a faint keel from head to pleon seg- ment 3. Head truncate, lower margin concave in front. Corneal lenses 4, the upper in upper angle of head, the lower on the lower margin. Postero-inferior angle of pleon segment 2 rounded, of 3 with a small point; segment 4 with a high, bluntly rounded dorsal keel. Antenna 1 extending to end of pe- duncle of antenna 2, and about equal to head plus peraeon segments 1 and 2. Antenna 2 very slender, 5th joint half length of 4th joint, flagellum extending to about 6th peraeon segment. Mandi- bular palp with linear 2nd joint. Peraeopods 1 and 2, dactyls longer than 5th and 6th joints together, 4th pig. 39. Ampelisca statenensis, a. Head. b. Pleon joint in peraeopod I not produced over segments 3-6, with uropod 3. c. Peraeopod 5 (setae on base of 5th joint. Peraeopod 5, 2nd joint 2nd Joint omitted)- expanded into a subtriangular lobe ex- tending downwards to end of 4th joint, obliquely truncate with hind angle rounded, greatest width opposite base of 3rd joint, 4th slightly longer than 3rd, 5th large, ex- panded on hinder apex, 6th as long as 5th, ovate, dactyl two-thirds 6th joint. Uropod 3, rami very broadly laminate, the outer ovate, outer margin spinulose, inner with long plumose setae, inner ramus rather more lanceolate, but with apex truncate, with plumose setae. Remarks. Somewhat resembling gibba, Sars, as regards the dorsal process on pleon segment 4, but more like latipes, Steph., as regards peraeopod 5. The 3rd uropods are very large. Specific name from the locality near Staten Island. Ampelisca brevicornis, Costa. Stebbing, 1906, p. 100. Barnard, 1916, p. 132. Schellenberg, 1925, p. 130 (formae dentifera, rectangula, intermedia and platypus). Occurrence: St
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