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



It now remains to classify the genera of Helicarioninas, a 

 matter of very considerable difficulty. After examining such 

 specimens as I could and comparing the published descrip- 

 tions and figures, especially those of Godwin-Austen, I drew 

 up in MS. a table of the species, dividing them into what 

 seemed the most naturally defined generic units. To do this 

 I was obliged to make as many as five new genera among 

 the Indian forms ; but from the paucity of actual material 

 available to me I hesitate to publish these as such, and will 

 treat them here as sections only, leaving it to students who 

 have better opportunities to increase the number of genera as 

 may seem desirable. 



Under each genus or section indicated below I have given 

 only the type species, as several of the named species are so 

 imperfectly known that it is not yet possible to say definitely 

 where they belong. 



IIeIicario?iince } sensu lat. 



\_3Iacrochlamys, Bens., = Nanina, Gray (type M. indicus, Bens.), has a 

 Heliciform shell and does not properly belong here ; hut Godwin- A.usten 



S laces certain Vitrina-l'ike shells, here called section Pseudovitrinae, in 

 lacrochlamysPj 



A. Shell whorled, truly Vitrinoid. 



1. Mantle little or not extending over shell. 



a. No dart-sac. Species American. 



i. Vitrinozonites, W. G. Binn. ( V. laUuir 

 mus, Lewis.) 



b. With a dart-sac or u amatorial organ." Species Asiatic *. 



ii. Cri/ptosoma f Theob. ( C. prcestans, Gld.) 

 iii. Maerochlavn/s, sect.~Pseudovitrince. (31. 

 Flemingii, Pfr.) 



H. Mantle more developed, but shell free behind and above. 



a. With an "amatorial organ." Asiatic. 



iv. Austenia, sect. Euausteniae. (A. scu- 

 tella, Bs.) 



b. With no " amatorial organ." 



b l . African v. Africarion, G.-A. (A. pollens, G.-A.) 



b 2 . Australian vi. Helicarion (Fer.), G.-A. (H. Cuvieri, 



Fer., II. heletue, G.-A.) 



[I do not pretend to understand the relationships of the very numerous 

 species referred to Helicarion by authors. From the shells alone little 

 can be judged, .and it will probably be long before the animals of all are 

 well enough known to enable us to give an approximately final arrange- 

 ment.] 



* For further details concerning these see Godwin-Austen, ' Land and 

 Freshwater Mollusca of India.' 



