214 MESSES. A. S. KENNARD AND B. B. WOODWARD ON THE 



Linne was most unfortunate in his selection of further illustrations for the 

 12th edition of the ' Systema,' those from Bonanni, Lister's 'Hist. Conch.' 

 and Klein's copies of these last, being all well-marked marine trochoids ; 

 whilst the reference to Adanson is hopelessly wrong. 



* Viviparus (Helix, L.) vivipara (14). 



Linne's description "H. testa imperf orata " definitely determines which of 

 the two closely allied forms he had in mind, but of the figures referred to, 

 Lister's " exerc. 2. p. 17. t. 2 [f. 5]," which is Muller's fasciata, shows that 

 he had not discriminated between them. Any possible uncertainty is, 

 however, set at rest by our discovery the other day that two of the speci- 

 mens bore the number " 603," that of the species in the 10th edition of the 

 ' Systema' in the master's own handwriting f. 



There are now, in the same glass-topped box, two specimens of fasciata, 

 obviously from quite a different gathering, and these we are inclined to think 

 may have been sent him by Miiller, whose separation of the two forms is 

 correct, and whose name has priority over contecta, Millet, which has of late 

 been generally used. 



Turbo reflexus. 



We do not agree with Hanley that because examples of Pomatias elegans 

 (Mull.) were found in the box marked for Linne's Turbo reflexus that 

 Dillwyn's surmise was correct. Like other Mullerian species they may have 

 come from that author. 



Linne's phrase " apertura reflexa " and " Habitat in Europa australi " 

 dispose to our mind of the possibility of its identity with Muller's elegans, 

 but we decline to speculate on its correct interpretation. 



*Theodoxus (Nerita, L.) fluviatilis & LACUSTRIS. 



There is, fortunately, no hesitation as to the correct ascription of Linne's 

 name fluviatilis to the form that has always borne it; whilst we further 

 agree with Hanley in believing that the lacustris was only a variety of the 

 same polychromatic shell. 



*Uxio (Mya, L.) pictorum. 



Although the diagnosis is too meagre to show which of the two forms 

 pictorum or tumidus was meant, the figure first cited by Linne (Lister ang. 

 app. t. 1. f. 4) is that of the commonly accepted pictorum, whilst the inscribed 

 specimen in the collection certainly is. There is an individual also in the 

 cabinet of tumidus but without any history. The added reference in the 10th 

 edition of the ' Systema ' to " Bonan. recr. 2. t. 41," which is a copy of 



t After this paper was written and handed in Mr. J. W. Taylor has placed on record 

 (Naturalist, 1918, p. 249) that this fact had been observed by him and Mr. Roebuck, to 

 -whom belong the credit of having detected specimens that escaped us some years ago. 



