294 



Hemipleurotoma quoyi, DesmouHus. 



rienrotoma quoyi, Desmoulins, Actes Soc. Linn., Bordeaux, 

 1842, p. 61; Reeve, Conch. Icon., vol. i., 1843, pi. 16, fig. 137; 

 Sitrciila quoyi, Desmoulins, Tryon, Man. Conch., 1884, vol. vi., n. 

 167, pi. xxxiv., fig. 82; Plenrotoma (Surgula) quoyi, Desmoulins, 

 Weinkauff, Conch. Cab. (Ed. Kiister), 1887, Bd. iv., Abt. iii., 

 p. 101, sp. 121, taf. xxii., fig. 2; Pleurotoma (DrUlia) quoyi, Des- 

 moulins, Watson, Chall. Reps. Zooh, vol. xv., 1886, p. 304; JDrillia 

 quoyi, Desmoulins, Pritchard and Gatliff, Proc. Roy. Soc, Vic- 

 toria, 1900, vol. xii. (N.S.), part 2, p. 170, "Western Port, etc."; 

 Hemipleurotoma quoyi, Desmoulins, Tate and May. Proc. Linn. 

 Soc, New South Wales, 1901, vol. xxvi., p. 368, "Tasmania." 



Pleurotoitia philipiueri, Tenison-Woods, Proc. Rov. Soc, Tas- 

 mania, 1876 (1875), p. 136; Tryon, Man. Conch., 1884, vol. vi., 

 p. 167, pi. xxxiv., fig. 82. 



rieurutuina inunile, Valenciennes (non Brocchi) Icon. Coq. 

 Viv. Mon. Fleurotoma, p. 62, pi. xv., fig. 3; CJuratula (Perrona) 

 ■monile, Val., Tryon, op. cit., p. 232, pi. vii., fig. 96. 



This shell has been placed in several sections or genera. 

 Cossmann, in Essais de Pal coconch. Comp., Denx Livr., 

 1896, separates the Pleurotomidse with an apical nucleus to 

 their operculum in a family Pleurotominse from the Clava- 

 tulinse with a lateral nucleus. In the former he puts the 

 genera Plenrotoma and Drillia; in the latter Glavatula and 

 Surcula. This species has an apical nucleus, and is there- 

 fore a Plenrotoma or a Drillia, and not a Glavatula or Siir- 

 cula. The sinus, located at the carina and not above it near 

 the suture, makes it a Pltxirotoma and not a Drillia; while 

 the short canal places it in the section Hemipleurotoma (Coss- 

 mann, 1889). 



Dredged alive in 17 fathoms, Investigator Strait; and 

 in 10 and in 19 fathoms, Yankalilla Bay. It has been taken 

 dead at all depths from 10 to 22 fathoms in Gulf St. Vin- 

 cent and Spencer Gulf, and Backstairs Passage. 



A variant was taken in deep water in 110, 150, and 

 200 fathoms off BeachjDort, 4 good specimens and 3 very poor, 

 and in 130 fathoms off Cape Jaffa, all dead. It is longer 

 and narrower, and has a less marked carina, and the spiral 

 lirae are less unequal. The type of P. monile, Valenc, Kien- 

 er's Coq. Viv. Icon., p. 52, pi. xiii., fig. 3, from "the seas 

 of Oceania, the shores of New Holland, at Western Port," 

 shows no nodules either at the suture or at the angle. The 

 transverse lirae are described as striae, but the figure sug- 

 gests spiral incisions, equidistant. This is very different from 

 the South Australian form, which has well-marked nodules 

 below the suture and on the angle, and valid spiral sub- 

 distant lirae, with two or three interstitial lirulae between 

 them. Shells sent me from the type locality, dredged by 

 Mr. Gabriel, are much more typical, and confirm the figure 

 and description, and show our shells to be variants. 



