254 SMITH : ON THE GENUS SCUTUS, 



He places together P. elongatus Lam., P. Icevis Blainv., 

 and his own Scutus angustatus, remarking that the species is 

 "also known fossil." Here is one chain of mistakes. The P. 

 elongatus of Lamarck is the same species as P. Icevis of Blainville, 

 is only found in the fossil state and is quite distinct from any- 

 recent one. Scutus angustatus too is a totally different species 

 from that figured {S. anati?ius), being as above stated only a 

 variety of S. unguis. Figure 21 on plate xiv. is said to represent 

 elongatus Lam., whilst in reality only a form of the Linnean species 

 is delineated. 



Sowerby in the 'Conchologia Iconica' has to a great extent 

 copied the errors of the Thesaurus' monograph. His notion of 

 S. unguis and S. hreviculus corresponds with that of A. Adams. 

 He however correctly ascribes P. elongatus to Blainville, but 

 unfortunately locates P. australis Lam., P. Icevis Bl. and Scutus 

 angustatus A. Ad. among the synonymy. The first is the same 

 as Blainville's species, but the two others are totally distinct; the 

 one being a fossil, the equivalent of Lamarck's P. elongata as 

 already stated, and the latter a variety of P. 'unguis. 



In repeating A. Adams's error of ascribing a P. tumidus to 

 Quoy and Gaimard, the confusion is " varied by Sowerby in 

 considering it the same as hreviculus Bl., whilst A. Adams was 

 of opinion that the latter might be a questionable variety of the 

 former. They are however totally distinct shells. 



The animal of Scutus was first described by Blainville in the 

 'Bulletin des Sciences par la Societe philomatique de Paris' 18 17. 

 He there described two specimens from the collection of the 

 British Museum which are still in a fair state of preservation. MM. 

 Quoy and Gaimard in the ' Voyage de I'Astrolabe ' give further 

 anatomical details. The only additional information published 

 respecting the animal consists of the description of the dentition 

 of S. anatinus (= Pannophorus Australis) by J. Hogg in the 

 'Trans. Royal Microscopical Society,' and also that of Scutus 



J.C., ii., August, 1S79 



