Questions of Mai icolog leal Nomeaclatare. 123 



the first to constitute the genus scientifically. If Oonoafomaj 

 Raf. (1810), is a valid name in ichthyology^, as PiUbry 

 asserts, we cannot retain Gonostoina, Iher., instead of IIelico~ 

 donta, liisso. Sec. 



With regard to Ileliomanes and Hygromanes, Fer,, all I 

 maintain is that they should be treated both in the same way, 

 their position in Ferussac's work being absolutely the same. 

 They are both subsections of Ilelicella and both good Greek 

 words, plural and singular of which are identical. Pilsbry 

 repeats tiiat Hygromanes was intended for a noun in the 

 plural, and is not acceptable, llijgromanes may have been 

 employed by Ferussac as plural ; at the same time it is a 

 singular, meaning " fond of moisture," just as lldiomanes 

 signifies '' fond of sunshine," or Doxjniaaes " desirous of 

 glory," &.C. If lliigroinanes is in;i|)plicable, wiiy does Pilsbry 

 i\i\n\\i Utliomanes'} Ulsso^s inrm H'/gro/nia is an utigram- 

 niatical mutilation of Hygromanes without any sense. 



I have not sought to prove, as Pilsbry says, that Trichia, 

 de Haan, bears the date of 1850, but I have simply quoted a 

 Ciucinological author who made that assertion. If Ilaan's 

 original work was accessible to Pilsbry, he should have 

 verified the date before he wronj^ly disputed the priority of 

 Trichia, Hartm., which he now has to admit. 



With reference to i^/-?<^icicoZ«, l.must admit that I could 

 not consult the original work ; but Herrinannsen states 

 distinctly in his ' Index ' that the type of FruticicoJa is 

 H. fruticuni. Field's mixed group competes either with 

 Ilyqromanes (or Ilygromia) or with Eulota, but in no instance 

 with Trichia. 



In the case of Plectotropis and JEgista Pil-bry must have 

 entirely misimderstood my writings, when he alleges that I 

 consider them distinct genera on account of the keel. Does 

 he not know that there are species of Plectotropis with 

 rounded and of ^gista with angulated periphery ? Tiie 

 real differences between Plectotrupis and jEgista are the 

 interrupted membrane-sculpture and the thin peristome of the 

 iormer, the thickened lip with convergent margins of the 

 latter. I say distinctly * : — " The strongly thickened peri- 

 stome and its very convergent margins leave, even in angu- 

 lated or keeled species of yEgista, no doubt about their 

 belonging to that genus." The keel goes for nothing either 

 in these or any other groups. 



I have not tried to cast doubt upon what Pilsbry stated to 

 be the facts in the case of Otala, Schumacher. I have merely 



* ' Riniien-Mnlliisl<en AVej^tchiiia,' 18!>9, p. 17 (see also p. 23), 



