Discovery reports (1940) Discovery reports discoveryreports18inst Year: 1940 THORACIC CIRRIPEDES COLLECTED IN 1925-1936 229 Discussion. This species is here taken again in four locaUties. As I was previously able (Nilsson-Cantell, 1930) to study individuals younger and older than the type specimens, it was possible to state that the shapes of the valves of the capitulum are rather different in individuals of different age. The specimen here illustrated from St. 371 must be intermediate between a specimen figured by the author in 1930, text-fig. 9 d, and the type specimen (Nilsson-Cantell, 19
Discovery reports (1940) Discovery reports discoveryreports18inst Year: 1940 THORACIC CIRRIPEDES COLLECTED IN 1925-1936 229 Discussion. This species is here taken again in four locaUties. As I was previously able (Nilsson-Cantell, 1930) to study individuals younger and older than the type specimens, it was possible to state that the shapes of the valves of the capitulum are rather different in individuals of different age. The specimen here illustrated from St. 371 must be intermediate between a specimen figured by the author in 1930, text-fig. 9 d, and the type specimen (Nilsson-Cantell, 1921, text- fig. 29 //). The shape of the carinal latus especially is different in individuals of different age. There are certainly many doubtful species of Scalpellum described from young individuals. Thus, for instance, the specimen from St. 371 (Fig. i) shows a superficial resemblance to Scalpellum dubiiitn Hoek, 1883. The mouth parts and caudal appendages are here figured for this in- dividual to show the resemblance to the same parts of the type. Scalpellum rathbunae Pilsbry, 1907. Pilsbry, 1907, Bull. Nat. Mus. No. 60, p. 40. Nilsson-Cantell, 1921, Zool. Bidrag Uppsala, vn, p. 184. St. WS776. 46°i8'i5'S,65°02'i5'W. 110-9901., s. Gear OTG. Two specimens from Chaetopterus tubes. Fig. I. Scalpellum convexiim {Si. 271). «. Mandible. b. Maxilla I. c. Maxilla IL d. Cirrus VI and caudal appendage, e. Female{total length 9-4mm.), lateral view. /. Rostrum and rostral latera. Distribution. Off the east coast of Pata- gonia. The distribution of this collection is more westerly than Pilsbry's. Discussion. This well-defined species, earlier mentioned by Pilsbry (1907), and Nilsson-Cantell (1921), is here represented by one small and one full-grown specimen, the later one characterized by its long peduncle (comp. Nilsson-Cantell, 1921). The peduncle is about twice as long as the capitulum. To the description given earlier nothing need be added here. Scalpellum
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