2l8 



prominent, are greatly curved forvvards and inwards. The sculpture of the two species is very 

 différent; as remarked above, the -rounded, concentric ridges on the shells of H. (^i L.) philippi- 

 nartoii are separated by deep, regular furrowlike interspaces, only shghtly narrovver than the 

 ridges themselves, in H. {'^ L.) dautzenbergi^ on the other hand, the ridges are band-Hke, and 

 are separated from one another by thread-Hke, shallow grooves only. The palliai sinus of the 

 new species is also deeper, and the shells hâve inverted V-shaped markings of a brownish 

 colour on a creamy background. 



Measurements of Holotype: — Length i6 mm., height 13.5 mm., diameter 10.5 mm. 



Habitat: — The holotype and a few stray valves were dredged a't Banda Anchorage (St. 240). 



Genus Lioconcha Morch. 



1853. Lioconcha Morch, Cat. Yoldi, II, p. 26. 



1857. Lioconcha Adams, H. & A., Gen. Rec. Moll., II, p. 429. 



1868. Lioconcha Rômer, Mon. Venus, I, p. 147. 



1887. Lioconcha Fischer, P., Man. Conchyliol., p. 1080. 



1902. Lioconcha Dali, Proc. U.S. Nat. Mus., XXVI, p. 351. 



1903. Lioconcha Dali, Trans. Wagner Free Inst. Sci. Philadelphia, III, p. 125 1. 



Lioconcha is a good genus with a large solid, porcellanous smooth or concentrically 

 sculptured shell. It was regarded by some of the earlier authors as a synonym or a subgenus of 

 Circe Schumacher, but the hinge of the two types is quite différent. The génotype is Lioconcha 

 castrensis, (Linn.). 



I . Lioconcha polita (Roding). 



1782. Venus castrensis Chemnitz (ex parte), Conch.-Cab., VI, pp. 364, 365, pi. XXXV, 



figs. 37i> 372. 

 1798. Venus polita Roding, Mus. Boltenianum, p. 181. 

 1818. Cytlierea snicatina Lamarck, Anim. sans Vertèb , V, p. 568. 

 1824. Cytheria (sic) snicatina Dubois, Epitome, p. 70. 



1835. Cytlierea snicatina Deshayes in Lamarck, Anim. sans Vertèb., VI, p. 308. 

 1838. Chione snicatina Gray, Analyst, VIII, p. 305. 

 1843. Cytlierea Snicatina Hanley, Rec. Biv. Shells, p. 99, pi. IX, fig. 13. 



1845. Cytlierea snicatina Catlow & Reeve, Conch. Nomencl., p. 40. 



1846. Cytlierea Snicatina Chenu, Illustr. Conchyliol., Cytlierea, pi. XIV, figs. \a, b. 

 1851. Cytlierea snicatina Sowerby, Thés. Conch., II, p. 641, pi. CXXXIV, figs. 145, 146. 

 1853. Circe snicatina Deshayes, Cat. Conch. Brit. Mus., I, Veneridae, etc., p. 95. 



1855. Cytlierea snicatina Berge, Conchylienbuch, p. 56. 



1857. Cytlierea snicatina Rômer, Krit. Untersuchungen, p. 46. 



1860. Cytlierea snicatina Reeve, Flem. Conch.. II, p. 109. 



1862. Circe snicatina Chenu, Man. Conchyliol., II, p. 89, fig. 397. 



1862. Lioconcha snicatina Romer, Malakozool. Blàtt., IX, p. 145. 



1863. Circe sulcatitta Reeve, Conch. Icon., XIV, Circe, pi. IX, fig. 40. 



1868. Venus {Cytlierea, Lioconcha) snicatina Rômer, Mon. Venus, I, p. 16, pi, XLVI, figs. i, \a — c. 



1868. Cytlierea snicatina Pfeift"er in Martini-Chemn., Conch.-Cab. (N. F.), XI (i), Veneracea, 



p. 36, pi. XII, figs. I, 2. 



1869. Circe {Lioconcha) snicatina Dunker, Cat. Mus. Godeffroy, IV, p. iii. 

 1884. Cytlierea snicatina Grasset, Ind. Test. Viv., p. 266. 



1890. Lioconcha Snicatina Paetel, Cat. Conch. Samm., III, p. 74. 



1895. Lioconcha snicatina Melvill & Standen, Journ. Conch., VIII, p. 266. 



