362 



BRACHIOPODA OF THE 



1 — 3. Glottidia Palmierl, Dal]. 1. Exterior. 2. In- 

 terior of ventral valve, o, single septum. 3. Interior of 

 dorsal valve, p, diverging septum. 



4. Lingula ? Lesueuri. Internal cast. 



This very interesting species is now well known, but it has been questioned by M. 

 de Tromelin whether it is a true Lingula. In external, shape, size, and character, it 



closely resembles Glottidia Palmieri, Dall., 

 a shell that lives in the Gulf of California, 

 and is characterised by the presence of 

 a median septum in the interior of the 

 ventral valve (fig. 2 o), and two diverging 

 ones in the dorsal valves (fig. 3 p), so that 

 were the recent form fossilised it would 

 be hard to distinguish it from the Lower- 

 Silurian L. Lesueuri. In their memoir, 

 ' Essai d'un Catalogue raisonne des fossiles 

 Siluriens des Departements de Maine et 

 Loire' (Congres de Nantes, 1876), MM. 

 de Tromelin and Lebesconte observe that 

 some examples they have seen present a similar longitudinal mesial 

 ridge in the ventral valve, and two diverging short ones in the dorsal 

 valve. It must, therefore, remain for further consideration whether or 

 not L. Lesueuri should be placed with Glottidia. 



Since describing this species at p. 42 of my Silurian Monograph, 

 Mr. Vicary has found in a Budleigh-Salterton " pebble " a specimen with 

 its complete peduncle. This is remarkable, but it is not the first time 

 that the peduncle of a Brachiopod has been found preserved in the fossil 

 condition. If the reader will turn to p. 192 of my Silurian Monograph 

 he will find a figure of the peduncle of Mchivaldia subtrigonalis , Billings, 

 completely preserved in the fossil condition. 



Lingula Lesueuri is not an extremely common fossil in the " Ores Armo- 

 ricain " at Pontrean, Guichen, and Sion, in Brittany. It has also been 

 found at Chateaubriant. In his note on the Gres de Bagnoles (Orne), 'Bull. 

 Soc. Linn, de Normandie/ 3rd ser., vol. ii, p. 22, M. Moriere states that he found the shell 

 in the Gres Armoricain of that locality along with Lingula Brimonti, Lingula Salter/, 

 and Lingula Hawlcei. M. de Tromelin informs me that he likewise discovered the shell 

 under description at Lairoles, near Roquebrun, in the Parish of St. Pons, Departe- 

 ment of Herault. M. Barrois informs me that he found it likewise at St. Denis 

 d'Orgues. We may also mention that the Rev. P. B. Brodie picked up a specimen of 

 this Lingula in a quartzite pebble similar to what occurs at Budleigh-Salterton, in the 

 -Drift of Warwickshire, and another was collected in the Drift at Ladypool Lane, near 

 Birmingham, by Mr. Houghton, and presented by him to the Cambridge Woodwardian 

 Museum (Sup., PI. XL, fig. 19). 



Lanceolate forms of Lingula, very near in shape to L. Lesueuri, have received 

 different names. 



5. L. ? Lesneuri, 



with peduncle. 



Budleigh. 



