582 ME. L1NSDALL RICHARDSON OX [Nov. I906, 



lines of growth ' are very faint, but can be detected with the aid of 

 a lens. 



Judging from the matrix, the holotype came from the armatum- 

 zone ; but the species has also been recorded from the Upper Lias 

 (or Toarcian) of several localities. Mr. J. "W. Tutcher, who kindly 

 examined for me the collection which the late Edward Wilson kept 

 at his private residence, with a view to seeing whether it contained 

 any Liassic scaphopods, writes : 



' There are only three small boxes containing Dentcdia, two of which are 

 labelled '• Dentalium liassicum, U[pper] L[ias], Lincoln." ; 



Presuming that the Toarcian specimens are correctly named, 

 the records of this species are as follows : — Dentalium liassicum, 

 Moore, ' Middle Lias ' \armati\ Camerton (Somerset) ; ' Zone of 

 Am. annidatus,' Hob Hill, near Saltburn (Yorkshire) ; * Transition- 

 bed ' [acuti], Chipping Warden ; ' Lower Cephalopoda-Bed,' Upper 

 Lias [falciferi], Northamptonshire; ' Upper Lias,' Lincoln. 



Dentalium. limatulum, Tate. (Text-fig. 2.) 



T.d. 1870. Tate, Quart. Journ. Geol. Soc. vol. xxvi, p. 402. 



T.f Ibid. pi. xxvi, fig. 1. [But not the transverse section; for that see the 



appended text-figure.] 

 T.l. Cloverly (Shropshire). 

 H. ' Zone of Belemnites acutus.' 

 Colin. R. I. Murchison, Geological Society, Burlington House [No. 4441*] . l 



Yig. 2.- — Sketch of Protolog. — 'Shell small, moderately 



transverse section of thick, obtusely triangular, slightly curved, 



the anterior end of ornamented with numerous, closely-set, 



Dentalium limatu- regular, slightly-oblique and acute costse 



lum, Tate, to show [that is, transverse lines]. Dimension : 



the flat latero-dorsal length (teste Tate) = 0*5 inch.' 



portion of the test. .Remarks. — Unfortunately, only a 



fragment of the holotype, 3 millimetres 



in length, is preserved. A sketch of the 



transverse section of this is appended 



(fig. 2), but it will be seen to differ 



, u -.. afied about materially from Tate's. The flattening of 



6 diameters.] the left-hand side in the half adjoining the 



dorsal side is not due to crushing, as can 



be seen from the structure of the shell and the regular circularity 



of the aperture. The specimen is unique, but not abnormal, and 



is distinct from those forms found in the Lower Lias of Redcar 



which Tate associated with it (see p. 587). 



Dentalium minimum, Strickland-Buckman. (PI. XLV,figs. 13a-13c.) 



T.d. 1844. J. Buckman, in Murchison's 'Outline of the Geology of Cheltenham' 



new ed. p. 101. 

 T.f. None. 



1 This holotype was omitted from the ' List of Types & Figured Specimens 

 in the Collection of the Geological Society of London ' by C. D. Sherborn & 

 J. F. Blake (London, 1902). 



