240 TORNATELLIDES OF HAWAIIAN ISLANDS. 



tyckia is characterized by its small size, closely coiled whorls 

 and rather obtuse apex. No embryonic specimens have been 

 examined. 



In the immature specimen of the type lot, the first embry- 

 onic whorl is slightly flattened. There are faint indications 

 of spiral lines on the second whorl. The parietal lamella is 

 0.19 mm. in height. The upper columellar fold is 0.14, the 

 lower 0.19 mm. in height (fig. 9). There are four specimens 

 labeled as cotypes by Ancey in his collection, of which three 

 belong to T. virgula. 



The original description is as follows : 



Tornatellina macroptychia Anc. ' ' Shell conic-oval, fulvous- 

 corneous, with a rather silky sheen, marked with close, mi- 

 croscopic lines of growth, very minutely perforate. Spire 

 conic, nearly two-thirds the total length of the shell, the apex 

 minute, obtuse. Whorls 5 to 514, convex, regularly increas- 

 ing, suture impressed, the last whorl rather abruptly ovate, 

 slightly tapering. Aperture suboblique, truncate-rounded, 

 obstructed by strong white lamellte as follows : one very large 

 revolving parietal, and two acutely produced, horizontal colu- 

 mellar lamellae, the lower one larger. Peristome acute, nar- 

 rowly expanded in triangular shape at the columella. Length 

 2, diam. 1.2, alt. apert. 0.75 mm. 



"This small fulvous-corneous species is very peculiar. Its 

 strong Iamella3 are far more developed than in any Hawaiian 

 Tornatellina whatever. For a moment I thought this the fea- 

 ture of a shell not yet adult (for in nearly all the species of 

 this genus the lamellae are stronger in the young than in the 

 adult stage, when those of the columella disappear or become 

 weaker) yet the number of whorls seems to indicate a con- 

 trary view; moreover it is impossible to relegate T. macrop- 

 tychia. to any species yet known in the archipelago. The par- 

 ietal lamella is extremely large, and the two columellar la- 

 mellae are very prominent and placed horizontally, the lower 

 one being larger. The perforation is narrow and covered 

 above by the expansion of the columellar margin" (Ancey). 



