380 Mr. T. D. A. Cockerell's Notes on Slugs. 



XJroxys Rodriguezij de Bovre. 



This species is described by M. Preudhomme de Borre in 

 the Ann. d. 1. Soc. ent. de Beloique, 1886, p. 107, and he 

 njentions that it is the ^'■JJroxys dilaticollis, Deyrolle," a 

 manuscript name. In the British Museum collection there is 

 a specimen bearing- this manuscript name, and it agrees well 

 with the description of U. Rodriguezi. It appears to me, 

 however, that it is a Chmridium having a short, punctured 

 mesosternum and short anterior coxse. 



XLV. — Notes on Slugs ^ cJi'^cfiu ^'^ ih^ Collection at the British 

 Museum. By T. D. A. Cockerell. 



[Continued from p. 288.] 



III. The Genus Limacella, Blainville. 



While working on the slugs at the British Museum I came 

 across the type specimens of Limacella lactiformisy Blain- 

 ville. The two examples are in a bottle with the label 

 ^^ Limacella lactescens,''^ and another label, apparently written 

 by Dr. Heynemann, "Original zu Fig. 1. Taf. 7. Fer. Hist. 

 Nat." They are true Philomgcus, presenting no generic 

 difl^erence from the well-known species of that genus. 

 Heynemann (1884) has referred them to Avion, but he could 

 not have examined them sufficiently, and was no doubt misled 

 by the figure in Man. de Mai. (1827), pi. xli. That they are 

 really Blainville's types need not be doubted, as they agree 

 with his figures in outline, and his original description, 

 notwithstanding that he misunderstood the characters of the 

 slug, is sufficient to show that he had not an Arion before 

 him. He refers to the absence of a shell and the g^'nital 

 orifice at the base of the right tentacle. The outline of the 

 figure, and especially the anterior portion of the mantle, 

 suggests at once a Philomycus. The supposed Arion-Vike, 

 mantle indicated in the figures is really due to an outline of 

 some of the internal organs, visible on account of the trans- 

 parency of the slug. The figures in Journ. de Phys., 

 November 1817, show how the mistake began, fig. 4 having 

 even a sort of spiral coil in the middle of the anterior part of 

 the mantle. The figure of L. elfortiana in Man. j\lal. is the 

 same outline, but apparently patched up from an Arion ater, 



