. Bulletin - United States National Museum. La science. 326 Bulletin 54, UNITED STATES NATIONAL MUSEUM.. ASTACILLA^EC CA Benoît. Astacilla Benebict cseca, Proc. Biol. Soc. Washington, XII, 1898, p. 51.-Richard- fils, American Naturalist, XXXIV, 1890, p. 230 ; Proc. U. S. Nat. Mas., XXni, 1901, p. 550. Localité.-j2ittx&e 38^ 22' nord, longitude 70^ 17' 30" ouest (au sud de San Telmo Vine3^ard). Dej)e.l,8'-25 brasses. Corps étroit, elong-ate, vivre fois plus long que large, 2 mm. : 9^ mm. Tête plus large que longue, 1 mm. Li : mm., avec la marge antérieure profondément creuser entre le produit anter

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. Bulletin - United States National Museum. Science. 326 BULLETIN 54, UNITED STATES NATIONAL MUSEUM.. ASTACILLA Ci^CA Benedict. Astacilla cseca Benebict, Proc. Biol. Soc. Washington, XII, 1898, p. 51.—Richard- son, American Naturalist, XXXIV, 1890, p. 230; Proc. U. S. Nat. Mas., XXni, 1901, p. 550. Locality.—j2ittx&e 38^ 22' north, longitude 70^ 17' 30" west (south of Marthas Vine3^ard). Dej)th.~l, 8'-25 fathoms. Body narrow, elong-ate, live times longer than wide, 2 mm.: 9^ mm. Head wider than long, 1 mm. : li mm., with the anterior margin deeply excavate between the produced antero-lateral angles, and a small median point w ithin the excavation. The lateral margin on either side is produced in two acute triangular processes, an anterior and a posterior lobe. The e3"es are wanting. There are two tubercles on the head situated in the median line, one on the anterior portion and the other on the postcephalic lobe. The first pair of antennae have the basal article long and dilated; the second and third articles are sub- ecpial in length, slender, and both together about equal in length to the basal article; the fourth article is one and a half times longer than the third. The first an- tenna extend a little beyond the end of the second arti- cle of the peduncle of the second pair of antennae. The basal article of the second antennae is short and incon- spicuous in a dorsal view, being covered by the basal article of the first antenna^; the second article extends as far as the middle of the fourth article of the first antennge; the third article is twice as long as the second; the fourth is twice as long as the third; the fifth is a little shorter than the fourth. The flagellum is composed of five articles. The second an- tennte are 6 mm. in length. The first three segments of the thorax are subequal in length; the fourth segment is six times longer than the third, being 3 mm. in length; the fifth, sixth, and sev- enth segments decrease gradually in

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