A REVIEW OP VOLUTIDAE 



Jl 



and differs from the type In being longi- 

 tudinally coatate, excepting on the last 

 half of the body-whorl. Ribs numerous on 

 the upper whorls. The columella Is swollen 

 In the middle, with three strong plaits and 

 a fourth obscure one below, as In papulosa 

 papl I losa. 



Genus PACHYMELON Flnlay I926 



Pachymelon Marwlck, Trans. N Zeal. Inst, 

 vol. 56, p. 266, 281, 1926. 



Genotype: " Cymbiola" lutea Watson. 



Range: Waters off New Zealand, 



A highly specialized genus, the 

 shells provided with a shallow sinus. 



Pachymelon lutea Watson 1882 

 (Plate 13, Figure 91) 



Cymblola lutea Watson, Voyage H.M.S. Chal- 

 lenger, part Gastropoda, p. 255, plate 

 15, fig. 3, 1882: Jour. Linn. Soc. 

 London, vol. I6, p. 331, part 12. 



Pachymelon lutea Vatson. Powell: Shell 

 Pish of New Zealand, p. 8I, species IO87, 

 1937. Suter: Man. New Zealand Moll., 

 p. kh9. 



valuta Zufea Watson. Sowerby: Thes. Conch, 

 suppl. pi, 18 (PI. 517) fig. 172. 



Alt, 



68 



Hab. Cookian faunal province (Powell); 

 200 miles west of Cape Farewell, New 

 Zealand, 275 fms. (Challenger Expd. ) 



Shell fusiform, strong, pale buff, 

 with a high blunt spire, large aperture, , 

 slightly reverted outer lip, and four teeth 

 on the pillar. Sculpture: Longitudinals, 

 on the upper whorls there are a few slight 

 narrow ribs which are almost obsolete on 

 the later whorls; the lines of growth are 

 many and hair-like. Spiral, quite obsolete 

 The columellar swelling in front is very 

 small and slight. Color ashy white over 

 pale buff, entirely without gloss, the outer 

 lip and the body-glaze are rich buff, paler 

 inwards. Spire high, a little irregularly 

 bent, subscalar. Apex blunt, mamillary, 

 impressed. Whorls six and three-quarters; 



they are convex above, contracted into the 

 suture, perpendicular below; after the 

 first three they increase rapidly; the last 

 is slightly ventricose, long, attenuated in 

 front. Suture oblique, slightly impressed. 

 Irregular. Aperture long, but not wide, 

 oblique, with its two sides nearly parallel, 

 bluntly pointed above, ending below in a 

 broad, shallow, slightly emarginated, mi- 

 nutely bordered canal. Outer lip patulous, 

 thin, but expanded and rounded on the edge; 

 it rises on the penultimate whorl at its 

 junction, and is here drawn back into a 

 slight sinus with a very reverted edge. 

 Inner lip spreads widely as a thin glaze 

 on the body; above it is scarcely convex, 

 hardly concave in the middle, perpendicular 

 below, where are four not strong, equal, 

 concealed pale-colored, very oblique teeth 

 (Watson) . 



Pachymelon wilsonae Powell 1933 

 (Plate 23, Figure I60) 



Pachymelon uilsonae Powell, Recs. Austral- 

 ian Mus., vol. 1, p. 204, 1933. Shell 

 Fish New Zealand, p. 8I, 1079, 1937, 

 plate 12, fig. 6. 



Alt. 112, diam. 47 mm. 



Hab. Chatham Islands, New Zealand "very 

 rare" (Powell). 



GENUS COTTONIA Iredale 1934 



Cottonta Iredale, South Australian Natural- 

 ist, vol. 15, no. 2, p. 57, March, 1934. 



Genotype: Scaphella dannevtii Verco now 

 Cottonta nodiplicata Cox. 



Range: Western Australia; Great Australian 

 Bight . 



Iredale '3 description is as follows: 

 A genus of the Volntldae ( sensu latisslmo) 

 large, thin, elongate oval, large apex, 

 deciduous at an early stage, two or three 

 whorls remaining, outer lip thin, fragile, 

 columella with three long plaits. 



When Verco described this very fine 

 shell he overlooked Voluta nodiplicata Cox 

 from Rootnest Island, West Australia, and 

 these two have since been regarded as 



