126 PYRAMIDELLIDiE. 



key) . Recent : Mangerfiord (Sars) ; upper Norway, 

 15-70 f. (M f Andrew and Barrett, as O.plicata) ; Bohus- 

 lan, and tlie variety crassa on Pecten maximus (Loven) ; 

 Gottenburg, 12-20 f. (Malm); coasts of Denmark (mus. 

 Copenhagen) ; Loire-Inferieure (Cailliand) ; Arcachon 

 (Fischer, as 0. conoidea); Vigo (M'Andrew); Gulf of 

 Lyons (Martin); Nice (Mace); Spezzia (J. G. J.); Dal- 

 matia (Brusina, as 0. Novegradensis) . The variety an- 

 gusta has been dredged by M. Jean Susini at Ajaccio. 



Differs from 0. rissoides in its larger size, solid tex- 

 ture, and milk-white colour ; the spire is more tapering, 

 and the base is pointed or angulated ; the whorls are 

 not so convex ; and the mouth is considerably expanded 

 below the pillar, where the inner lip becomes nearly 

 straight, instead of being curved as in that species. 



I have no doubt that this was Montagu's Turbo pal- 

 lidums , judging from his detailed description and figure : 

 although he at first says that the pillar-lip is " destitute 

 of any tooth/' in the Supplement to his work (p. 133) 

 he expressly notices the " ridge or lengthened denticle 

 on the columella " of that shell, as well as of 0. spiralis, 

 unidentata, interstincta, and plicata. But the specimen 

 now in the British Museum, which has the name "pali- 

 dus" in Montagu's handwriting affixed to the under 

 side of the tablet, is a broken and worn Rissoa parva, 

 var. interrupta. It is unfortunately too probable that 

 when Dr. Leach rearranged this part of the national 

 collection, sufficient care was not taken to preserve the 

 identical specimens which had belonged to the first- 

 named excellent zoologist, and that in the present case 

 the type may have been lost, and replaced by the 

 wretched substitute now on the museum tablet. 



It is the Voluta ambigua of Maton and Backett, Turbo 

 unidentatus of Turton (not of Montagu), 0. unidentata 



