182 MOLLUSCA. 
In Beck’s book the generic name is printed ‘‘Orthalzcus,” and all subsequent authors 
have followed him; but this spelling, although evidently referring to the Greek 
language, bears no obvious meaning: P. Fischer (Manuel de Conch.) interprets it by 
dp0dc, straight, and aXixoc, a rare Dorian form for the common Greek 7Aixoc, how aged, 
how great. I am satisfied, however, that it is a misprint for Ortalichus, the Greek word 
opradcyoc signifying a young fowl, and Beck’s first species being the “ gallina sultana” 
of former authors, who compared the painting of the shell with the feathers of a fowl. 
The sculpture is essentially the same in all species: minute spiral striz, which are 
more or less visible, according to the well-preserved or worn surface of the shell, and 
_ faint strie of growth, which are stronger and more or less plait-like immediately below 
the suture. In some specimens there are also more or less numerous blunt and short 
impressions, as if caused by the blow of a hammer on a tin plate (impressiones malleate) ; 
but these are not available for the distinction of the species, as they are variable 
in individuals from the same locality which agree inter se in all other respects. As 
regards the markings, we may distinguish in each whorl several zones: in the upper- 
most the dark streaks (strige) are generally narrower and often forked upwards; in 
the middle one or median, corresponding to the middle part of the back of the 
animal, there are often broader streaks; and in the lower zone, which is covered in the 
upper whorls by the following one, and only visible in the last, they are again narrower 
and often paler—this is to be seen very distinctly in most specimens of O. princeps. 
Very often the streaks are angularly bent at the confines of the upper and median and 
at those of the median and lower zones, and if these angles are prolonged into the next 
streak, spiral bands may be formed. In many young specimens of 0. princeps, and 
also in some other species, there are two dark spiral bands in the lower half of the 
last whorl, the upper one in the continuation of the suture, the lower one about half- 
way between it and the centre of the base ; very similar bands are to be seen also in 
some species of Otostomus and even in young specimens of the Malayan genus 
Amphidromus. 
1. Ortalichus princeps. (Tab. X. figg. 3, 3a, b, 4-7.) 
, Lister, Hist. s. Synopsis Conch. lib. iv. t. 380. fig. 84 a (without name) (1688) *. 
Bulinus princeps (Broderip), Sowerby, Conch. Illustr., Bulinus, fig. 18 (1838) *. 
Bulimus (Orthalicus) princeps, Beck, Index Moll. p. 59°. 
Orthalicus princeps, Shuitl. Notitiz Malae. i. p. 64, t. 3. figg. 6, 7*; Pfr. Monogr. Helic. Vivent. 
iv. p. 589°; Morch, in Malak. Blatt. vi. p. 112 (1859)°; v. Mart. in Malak. Blatt. xii. p. 40 
(1865)"; Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 455, t. 18. fig. 2 (excl. varr.) °; 
Strebel, Beitr. Mex. Land- und Siissw.-Conch. v. pp. 11-16 (forms A-D, not E, F), t. 3. 
figg. 1 a—d, t. 4. figg. 1-5, 7, 8, 10, t. 8 (anatomy), t. 9. figg. 1-11, and t.11. figg. 1,3 (radula), 
t. 10. figg. 1, 4, 7-10, 12-14, 16, and t. 11. figg. 2 (jaw), 5 (embryonal shell) °; Pilsbry, Proc. 
Ac. Phil. 1891, p. 317. 
Bulimus undatus (Brug.), Valenciennes, Recueil d’Observ. Zool. ii. p. 245, t. 55. figg. 1 a,b (1833) “. 
