IREDALE : OX KERMADEC MOLLUSCA. 225 



where Risella is monographed, there is no mention of Bemlicium, 

 Philippi, to incite interest. 



1 might here point out that Cossman recently proposed a new 

 genus, which he named Risellopsis (Havre Bull. Soc. Geol., vol. xxvii, 

 p. 59, 1907 (1908)), but that name had been previously selected ))y 

 Kesteven (Rec. Aiistr. Mus., vol. iv, p. 319, 1902) for a New Zealand 

 mai'ine molluscan genus. 



LoRA, Gistel. 

 In the Bull. Mus. Comp. Zool., vol. xliii, p. 259, 1908, Dall 

 details the history of the generic names Defrancia, Millet, 1827, and 

 ClafhureUa^ Carpenter, 1856, selecting for type of Millet's genus 

 Befrancia pagoda, Millet, and accepting that as type of Clathurella, 

 Carpenter. It has apjiarenth' been overlooked that Gistel (Katurg. 

 Thierr. hoh. Schulen, 1848, p. ix) had introduced Zorrt as a new name 

 for Befrancia., Millet, noting B. viridida, U. Fabr., as a typical species. 



Pachtcheilus. 

 In the Penny Cyclopedia, vol. xvii, p. 454, footnote, 1840, this 

 name is introduced as a better name than Pachylabra, Swainson's 

 substitute for Pachystoma, Guilding, preoccupied. This would seem 

 to invalidate Lea's later Pachychilus. 



Trochus Boyanus, n.sp. PI. IX, Fig. 12. 



Shell pyramidal, large, massive, imperforate. Whorls more than 

 twelve, subscalar, last whorl strongly keeled, base flat. Colour white. 

 In adult specimens scul[)ture scarcely distinguishable, but on the 

 last whorl can be noted a sculpture of nodules somewhat after the 

 style of ornamentation seen on T. py?amts, Born, but much finer. 

 Base smooth, save for growth-lines. Aperture quadrate, very oblique, 

 the basal portion smooth inside ; outer lip thin, and very fragile. 

 Columella pearly, anteriorly terminating in a solid tubercle, and 

 ascending with a semicircular sweep. Operculum tliin, horny, multi- 

 spiral, nucleus central ; size 32 X 27 mm. 



Measurements of type : Height 84, major diameter, 84 mm. 



Mab. — Sunday Island, Kermadec Group. 



The type of Trochus, Linne, Syst. Nat., 10th ed., 1758, p. 756, 

 I now designate as 2\ maculatus, since T. Niloticus does not occur 

 there. 



Claxculus atypicus, n.sp. PI. IX, Fig. 7. 



Shell small, depressedly globose, solid, umbilicate ; periphery 

 rounded, base flattened. Colour: dark greyish-brown, painted 

 obli(juely with yellow or fawn. Whorls six. Sculpture consists of 

 fine spiral thi-eads of varying strengths, about eighteen major ones on 

 the last whorl. The preceding whorl shows six major threads only. 

 The axial sculpture is represented by very fine close lines. Suture 

 <leep, channelled, bounded by a row of nodules. Aperture oblique, 

 sub-quadrate, the outer lip slightly crenulate and recurved. Umbilicus 

 deep, surrounded by a noduled callused rim, tlie callus extending to 



