HALIOTIS. 87 



It is the Var. rugosa of Weinkauff. Lamarck's name is so well 

 known for this form that I deem it inadvisable to revive the doubt- 

 ful " striata " of Linne, which Hanley believes to be the same. 



H. sepiculata Reeve. PI. 16, fig. 86. 



Shell ovate, spirally peculiarly ridged, ridges narrow, erect, very 

 irregular, radiating, undulately plicated ; perforations large, six open ; 

 dark olive-green, here and there dotted with white. Well charac- 

 terized by the erect development of the ridges. (Rve.) 



Habitat unknown. 



H. sepiculata Reeve, Conch. Icon., t. 14, f. 50, 1846. 



H. japonica Reeve. PI. 14, fig. 77. 



Shell long-oval, depressed, spire submarginal, its distance from 

 the nearest edge about the same as in H. tuberculata. Sculpture 

 composed of fine close equal spiral threads and more or less developed 

 radiating coarse folds or elevated wrinkles. Perforations 5 to 7. 

 Yellow, variegated with red, olive-brown and green. 



Length 53, width 34 mill.; convexity 12 mill. 



Length 89, width 60 mill.; convexity 18 mill. 



Japan. 



H. japonica Reeve, Conch. Icon., t. 5, f. 13. — Sowb. Thes., t. 4, 

 f. 29.— Weinkauff, Conchyl. Cab., p. 58, t. 22, f. 5, (i.—H. aquatilis 

 Reeve, Conch. Icon., f. 54. — H. incisa Rve. 1. c. f. 57. 



This species is almost exactly like the Mediterranean H. tubercu- 

 lata var. lamellosa. It differs in having finer, equal spiral threads. 

 Weinkauff places H. reticulata Rve. in the synonymy of japonica, 

 but Monterosato having examined the type in the British Museum, 

 identifies it with a Mediterranean variety of H. tuberculata. 



H. aquatilis Reeve (pi. 6, fig. 35) is doubtless synonymous. It is 

 from the Kurile Islands, south of Kamtchatka. It has been 

 referred by Schrenck to H. Kamtsehatkana, but the greater number 

 of perforations (6) and the absence of strong undulation will sep- 

 arate it from that form. 



H. incisa Reeve has also been placed in the synonymy by Wein- 

 kauff. 



H. bistriata Gmelin. PI. 48, figs. 14, 15, 16 ; pi. 4, figs. 11, 12. 



Shell oval, much depressed, distance of apex from margin about 



one-eleventh the length of the shell ; sculpture consisting of very 



clearly-cut, low, rounded spiral cords, alternating with narrow 



