148 DISCOVERY REPORTS 



Prosipho madigani Hedley 



Prosipho madigani Hedley, 1916, p. 56, pi. 8, fig. 93. 



Type locality. 25-50 fathoms, Commonwealth Bay, Adelie Land. 

 St. 182. Schollaert Channel, Palmer Archipelago, 64° 21' S, 62 58' W, 14 Mar. 1927, 278-500 m. 



This sole example measures 10-5 x 4-9 mm. and has 5J whorls, compared with 13-5 x 4-3 mm. and 

 six whorls for Hedley 's type. Hedley's measurements are evidently incorrect, however, for the figure 

 shows proportions and sculptural detail in accord with the St. 182 specimen. 



The above new record extends the range of the species to the opposite side of the Antarctic 

 Continent. It is of interest also to note that Tomlin (1948, p. 229) has recently recorded the species 

 from Macquarie Island, which is considerably north of the type locality and just outside the Antarctic 

 convergence. 



Dentition. Fig. K, 54, p. 193. The laterals resemble those of astrolabiensis, but the basal plate 

 is more produced and there are three cusps instead of two. 



Genus Anomacme Strebel, 1905 

 Type (monotypy) : Anomacme smithi Strebel 

 The genotypes of both Antistreptus (Dall, 19026, p. 532) and Anomacme are superficially very similar, 

 apart from the fact that the former is sinistral. The apices are different, however, that of Anomacme 

 being decidedly Trophonoid in its asymmetric elongated and almost straight-sided whorls. The radula 

 of A. smithi, however (Thiele 1912, pi. 16, fig. 14), is similar to that of Prosipho, for the laterals have 

 the basal plate produced into long narrow process resembling a handle. Unfortunately, the dentition 

 of Antistreptus magellanicus is not known, so for the present it is not advisable to follow Thiele (1929, 

 p. 318) in closely associating Antistreptus and Anomacme. 



Anomacme smithi Strebel 



Anomacme smithi Strebel, 1905 b, p. 633, pi. 22, fig. 2%a-e. 

 Anomacme smithi Thiele, 1912, pi. 13, fig. 8 and pi. 16, fig. 14. 

 Antistreptus {Anomacme) smithi Thiele, 1929, p. 318. 



Type locality. Smyth Channel, Strait of Magellan. 



St. 388. Between Cape Horn and Staten I., 56 19V S, 67° 09!' W, 16 Apr. 1930, 121 m. (one empty shell). 



Dentition. Fig. K, 57, p. 193 (after Thiele, 1912). 



Strebel's Glypteuthria contraria (1908, pi. 1, fig. 4) is a synonym of Antistreptus magellanicus Dall 



(1902). 



Genus Meteuthria Thiele, 191 2 



Type (o.d.) : Euthria martensi Strebel 



Although martensi appears to be a heavily sculptured Pareuthria, comparable with Glypteuthria, the 

 dentition indicates closer relationship with Proneptunea. Both have triangular or fan-shaped laterals, 

 the top slope with from four to six cusps and the outer edge with a series of denticles. In Meteuthria 

 only the laterals are present, but Proneptunea has the addition of a tricuspid central tooth. 



Thiele (1929, p. 317) included the Antarctic Chlanidotella, Proneptunea and Meteuthria as subgenera 

 of Thalassoplanes, a tropical mid-Pacific genus from 2463 fathoms. 



The genotype of Meteuthria has a conical protoconch of z\ whorls, the tip smooth, small and pro- 

 jecting, followed by a whorl of closely spaced, thin, crisp axials and the remainder reticulated by axials 

 and somewhat stronger spirals. Other members of the genus are Watson's Fusus (Sipho) futile from 

 between Kerguelen and Heard Islands in 150 fathoms (Watson, 1886) and Euthria (Glypteuthria) agnesia 

 Strebel (1905) from Strait of Magellan. 



