SYSTEMATIC 149 



In Glypteiithria the protoconch consists of a relatively large, mammillate, smooth, brownish apex 

 of 1 1 whorls followed by a brephic reticulated stage. 



Meteuthria martensi (Strebel) 



Euthria (Glypteiithria) martensi Strebel, 19056, p. 630, pi. 21, fig. 13a, b. 

 Meteuthria martensi Thiele, 1912, p. 243, pi. 13, fig. 7 and pi. 16, fig. 18. 



Type locality. Smyth Channel, 10 fathoms, Strait of Magellan. 



St. 388. Between Cape Horn and Staten I., 56° 19J-' S, 67° 09I' W, 16 Apr. 1930, 121 m. (empty shells only). 



Dentition. Fig. K, 62, p. 193 (after Thiele, 1912). 



Genus Proneptunea Thiele, 191 2 

 Type (o.d.): Fusiis (Troschelia}) sp. Martens & Thiele, 1903 = Proneptunea amobilis Thiele, 1912 



The shells of this genus are small, fusiform, with a thick brownish epidermis and are sculptured 

 with prominent spiral keels. The protoconch is relatively large, paucispiral with straight sides, slightly 

 concave on top and with an inrolled nucleus. The operculum is horny, irregularly ovate-quadrate, with 

 a terminal nucleus. The radula consists of a deep and narrow-based tricuspid central and quadrate 

 laterals with five well-formed cusps on the upper edge and a series of small denticles down the outer 

 margin. 



Martens and Thiele 's Fnstis (Troschelia}) sp. and Thiele 's Proneptunea amabilis, both from Kerguelen 

 Island and acknowledged to be identical by Thiele (1912), have this same style of dentition. 



Proneptunea fenestrata n.sp., PI. VI, fig. 12 



Shell small, fusiform, with a thick yellowish brown epidermis, prominently sculptured with heavy 

 spiral keels and interstitial thin axial lamellae. Whorls five including a relatively large paucispiral erect 

 protoconch of 1 1 straight-sided whorls inrolled at the tip, leaving an apical depression. Spire slightly 

 taller than height of aperture plus canal. Spire whorls bearing two very prominent keels, the upper- 

 most, which defines a broad, almost flat shoulder, becoming bifid at the commencement of the penulti- 

 mate whorl. Body-whorl with the addition of a third prominent keel at the top of the aperture and 

 three much weaker spirals on the base. The shoulder, the interspaces and base crossed by regular 

 crisp axial epidermal lamellae, twenty-one on the penultimate and twenty-nine on the body-whorl. 

 Aperture approximately ovate-pyriform, deeply grooved on the inside, corresponding to the external 

 keels. Outer lip deeply scalloped between the keels, but bridged by the lamellae. Anterior canal short, 

 oblique, and spirally twisted, causing a prominent fasciole which is crossed transversely by a con- 

 centration of the terminals of the lamellate processes. In some examples the bifid peripheral keel 

 shows the lamellae in the interspace, but on the crest of the keels the lamellae are scarcely apparent. 

 Operculum irregularly ovate-quadrate, with a terminal nucleus. 

 Height 12-0 mm.; diameter 6-6 mm. (holotype, St. 141). 



Type locality. St. 141. East Cumberland Bay, 200 yards from shore, under Mt Duse, South 

 Georgia, 29 Dec. 1926, 17-27 m. 



St. 140. Stromness Harbour to Larsen Point, South Georgia, from 54 02' S, 36 38' W to 54 n' 30" S, 



36 29' W, 23 Dec. 1926, 122-136 m. 

 St. 145. Stromness Harbour, between Grass I. and Tonsberg Point, South Georgia, 7 Jan. 1927, 26-35 m. 

 St. WS 25. Undine Harbour (north), South Georgia, 17 Dec. 1926, 18-27 m. 



St. MS 10. East Cumberland Bay, \ mile south-east of Hope Point to \ mile south of Government Flagstaff, 

 South Georgia, 14 Feb. 1926, 26-18 m. 



Dentition. Fig. K, 67, p. 193 (St. 141). Protoconch and Operculum. Fig. N, 106, 124, p. 196. 



