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



cP. Keel strongly flexuose ; no dart-sac. 



XX. Dendrolimax, Dohrn. (D. Heynemanm, 

 Dohrn.) 



d^. Body with lateral ridges ; " a dart-gland united with penis." 

 xxi. Buettneria, Simroth. {B. Leuckarti, 



Simr.) 



d^. Dart-sacs two or more, each with two darts. 



xxii. Trichoto.von, Simr. {T. Heynemanni, 

 Simr.) 



d^. Like Urocyclus and Elisa externally ; anatomy resembling 

 TrichotoxoUf but no darts. 



xxiii. Atoxony^ivax. (A.JIildebrandti,SimT.) 



cC. Similar externally ; vas deferens with no kalk-sac. 



xxiv. Phaneroporus, Simr. (P. Reinhardti, 

 Simroth.) 



D. " No internal shell." Borneo. 



XXV. Daymantia, Issel. {D. dilecta, Issel.) 



Urocyclus and its Allies. 



For a y&xj elaborate account of these slugs see Dr. H. 

 Simroth, *' Beitrage zur Kenntniss der Nachtschnecken," in 

 Nova Acta Ac. Cees. Leop.-Car. Germanicge Nat. Cur. 1890. 

 In this paper several new genera are described and figured. 

 Some of them (i. e. Atoxon and Phaneroporus'^) are like Uro- 

 cyclus externally, but differ in the genitalia. I follow Dr. 

 Simroth in keeping these as genera, although my own impulse 

 in the matter would be to regard them merely as subgenera of 

 Urocyclus. 



Buetttieria'f , with the lateral ridges on the body, seems a 

 conveniently-established genus, especially if it can be made 

 to include the other ridged species, fasciatus, v. Mart., acumi- 

 nafus, Poirier, and madagascariensis, Poirier. 



Tricliotoxon is very peculiar as to its dart-sacs, and appa- 

 rently deserves to stand as a genus. DendroUmax is suffi- 

 ciently peculiar in the form of its body and very flexuose 

 keel. 



Nevertheless one suspects that when the African slugs 

 become thoroughly well known the present established generic 

 divisions will not be found so absolute or so trustworthy as 



* I write Phaneroporus, as it is written so in Simroth's recent paper ; 

 but elsewhere it appears as Phaneropus. and Dr. Simroth has used this 

 latter spelling in writing to me under date 28th October, 1890. 



t There is a well-known genus of plants called Buttneria, Linn., 1767, 

 while another genus of slugs, Apera, Heyn., is preoccupied by Apera, 

 Adans., 1763, a subgenus of Ayrostis with no very strong characters. 

 The feeling seems to be that preoccupation in botany should not interfere 

 with a zoological generic name. 



