SITALA. 225 



G-enus SITALA. 



Sitala, H. Adams, P. Z. S. 1865, p. 408. 

 Conulema, Stoliczka, J. A. S. B. 1871, 2, p. 236. 

 Sitala, Godwin-Austen, Mol. 2nd. i, 1882, p. 25. 



Type, 8. infula, Bs. 



Range. Indo- Malay Region. 



" Shell conoidal, thin, consisting of many, usually spirally-ribbed 

 or striated whorls ; base convex, narrowly or indistinctly um- 

 bilicated; margin of the aperture thin, not expanded; outer 

 simple." (Stoliczka.'} 



Typical examples of the genus are more or less trochiform and 

 horny, and, as a rule, surrounded by spiral costulation. A large 

 number of small species may belong either to this genus or to 

 Kaliella, or possibly to other forms. As a rule, those referred to 

 Sitala are distinguished by spiral sculpture, sometimes very fine 

 and only visible under a microscope. But in some cases the 

 characters of the radula, despite the presence of spiral sculpture, 

 have caused the species to be referred to Kaliella. 



" Animal (of typical species) narrow, long (generally equal to 

 twice the greater diameter of the shell) ; pedicles long, tentacles 

 much shorter ; lateral line (peripodial groove) distinct, the margin 

 beneath it smooth ; gland at the end of foot large, superseded by 

 a distinct horn ; sole grooved ; two shell- and two dorsal lobes to 

 the mantle, all of them small and with no separately produced 

 appendages, but slightly extended on either end ; genital organs 

 with or without an amatorial gland ; a simple appendix to the 

 penis, produced into the penis retractor ; receptaculum seminis 

 (spermatheca) terminating with a bulging end, bedded in the 

 posterior portion of the oviduct and prostata. Jaw thin, trans- 

 parent, smooth, indistinctly or finely concentrically striated in the 

 middle. Radula large, consisting of numerous (above 100) trans- 

 verse rows, each with very numerous (300 to above 400) teeth, a 

 very few median teeth being conspicuously larger than the laterals, 

 which are narrow, pectiniform, and very gradually decreasing in 

 width." (Stoliczka.} 



Unfortunately the animal of only two species (infula and 

 attegia) has been examined. These differ in the presence or 

 absence of a dart-sac or amatorial organ. 



A. Typical, subtrocJiiform or tarbinate, spirally ribbed. 

 a. Columella slightly reflected. 



336. Sitala infula, Bs. (Helix) A. M. N. H. (2) ii, 1848, p. 160 ; Pfr. 

 (Helix) Mon. Hel. iii, 1853, p. 58 ; id. vii, 1876, p. 103 ; Stoliczka 

 (Conulema), J. A. S. B. 1871, 2, p. 239, pi. 18, figs. 5-9 (shell, 

 animal, and anatomy) ; 1873, 2, p. 16, footnote j H. $ T. (Helix) 

 C. /. 1876, pi. 54, fig. 9 ; Nevill, Nanina (Sitala), Hand-l i, 1878, 

 p. 33 ; Godwin-Austen, Mol. Ind. i, 1882, p. 26, pi. 8, figs, l-l/ 

 (shell, animal, and anatomy). 



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