^°1893^''] PKOCEEDINGS OF THE NATIONAL MUSEUM. 383 



" This form is iiiucli more slender than P. ('hcmniizioides Fbs., whicli is 

 well represented by the figs. C«, 0/>, PI. ix, Proe. Zool. Soc. London, 

 -1850. Aside from tlie diff'erenees in color and scnlpture, the snrface of 

 Forbes's species is dnll in fresh, unrubbed, perfect specimens; the ribs 

 in the latter species are comparatively sharp, threadlike, regular, and 

 somewhat distant, the interspaces being perceptibly wider than the 

 ribs are thick." 



Again borrowing from Keibisch, it is seen that the foregoing occurs 

 at an elevation of from 900 to 2,000 feet in the wooded region, on mossy 

 rocks and under stones, and he ({notes Wolf's notes, and says that it 

 is abundant, though it appears that Reibisch had only four examples, 

 of which hardly one was well preserved. 



The various species made by Reibisch are based, it would seem, upon 

 a very uncertain foundation, the number of individuals, in most cases 

 being altogether too limited, the extraordinary variability of the Gala- 

 pagos land shells being considered, and the few examples upon which 

 in nearly every instance his diagnoses rest, were generally in poor con- 

 dition. 



Family SUCUINID.F. 



(Jcniis SUCCINEA l)rjip:iiiiiiii<I. 

 29. Succinea Bettii Smith, viir. --^ S. Wolfi Heib., var. 

 Chatham Island, one example (Mus. No. 122133). 

 This shell is a narrow, delicate variety of the species described by 

 Mr. Smith, whose specimens were from Charles Island (l'etrel-(Jookson 

 collection). This solitary Albatross example agrees with Keibisch's 

 Fig. 12^ in PI. ii of his paper. 



Family ()N(JHIDfID.F]. 



Genus ONCHIDIUM Cuvior. 



30. Onchidiuni Leslie! Stearns. 



Pnliiiiinary description in " Tiie Nautilus," December, 1892. 



Plate I.I, ligurcs 2,11 



Between tide marks, living. 



Charles Island, April 8, one exanqde (Mus. No. 122519); Albemarle 

 Islaud, April 10, 1888, two specimens (Mus. No. 122520). 



Form rounded ovate, nearly as broad as long. Dorsum coriaceous, 

 nearly black, shiny, closely irregularly reticulated witli finely incised 

 lineation, and otherwise characterized by somewhat distant, rather 

 flatly rounde<l papilhe. Under side dingy, yellowish white; margni of 

 mantle Avide, nearly smooth; edge of same simple. Anal opening pos 

 terior near edge of mantle and sojuewhat produced. Respiratory 

 orifice smaller, in median line witli and in front of anus. Sexual ori- 

 fice anterior, on the right side under the edge of the large oral hood or 

 collar. Labial palpi thin, largely expanded. Dimensions: Length, 37.5; 



