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. U.S. Nat. Mus. No. 60, 

 p. 40. 



Nilsson-Cantell, 1921, Zool. Bidrag Uppsala, 

 vn, p. 184. 



St. WS776. 3.xi.3i. 46°i8'i5"S,65°02'i5"W. 

 110-9901., gn.m. 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 compactum Borradaile, 1916. 



Borradaile, 191 6, Brit. Mus. {Nat. Hist.), Brit. Antarct. (' Terra Nova') Exp. 19 10, Nat. Hist. 



Rep. Zool. Ill, No. 4. London. 



Nilsson-Cantell, 1921, Zool. Bidrag Uppsala, vn, p. 198. 



St. 1652. 23. i. 36. 75° 56' 00" S, 178° 35-5' 00" W. 567 m. Gear DRR. Some specimens on 

 Hydroids. 



Distribution. Graham Land region, Ross Sea, McMurdo Sound, 91-567 m. 



