TRICHODINA. 187 







Achatina monticola MOREL., Journ. de Conchyl. 1866, p. 

 160; Voy. Welwitsch p. 77, pi. 5, f. 7. CROSSE, Journ. de 

 Conch., 1868, p. 135. PFR., Monogr., vi, 1868, p. 231. Ho- 

 morus m., GIRARD, Jornal de Sci. Math. Phys. e Nat. Lisboa, 

 (2), iii, p. 96, pi. 1, f. 5-8 (1893). Achatina (Subulina) 

 subcrenata GREEF, Zool. Anzeiger 1882, p. 519. Homorus 

 subcrenulata CROSSE, J. de C. 1888, p. 25. H. (Pseudogles- 

 sula) monticola KOB., C. Cab. p. 107. 



The above description from Morelet was based upon im- 

 mature specimens. Girard has made a careful study of very 

 numerous specimens collected by F. Newton, who found it 

 in numerous places, nearly always under stones. There are 

 many more or less differentiated local races, the following 

 being described by Girard. The first description applies to 

 the adult form of typical monticola, of which subcrenata 

 Greef is a synonym. 



a. PL 56, fig. 5. Shell imperforate, elongate, turriculate, 

 thin, glossy, of a light yellow color; with slightly oblique, 

 irregular, more or less pronounced growth-striae, projecting 

 at the suture, finer and less marked on the last whorl. Spire 

 composed of 12 slightly convex whorls, with a deep suture and 

 terminating in a rounded summit. Embryonic whorls 2, 

 nearly smooth, or finely striate. Last whorl contained about 

 4% times in the total length, rounded. Aperture oval, elon- 

 gate; peristome simple, sharp, the margins united by a very 

 distinct deposit. Columellar margin arcuate, very obliquely 

 truncate before reaching the base. Length 35, diam. 8 mm. ; 

 aperture 8.5 mm. long, 4.5 wide (Girard}. 



b. PI. 56, fig. 6. Less lengthened, the striae indistinct ex- 

 cept at the sutures; last whorl contained 3y% times in the 

 total length. 



r. PL 56, fig. 8. Very much lengthened, very glossy, the 

 striae indistinct except at the suture; last whorl contained 5 

 times in the total length; whorls plano-convex. 



d. Var. costulata Greef. PL 56, fig. 7. Suture very deep ; 

 striae irregular and very prominent. 



Achatina (Subulina) costulata GREEF, Zool. Anzeiger 1882, 

 p. 519. 



