i83 



and rather obliquely rostrate, obliquely truncate with two radial folds separated by a concave 

 furrow; umbones not very prominent, smooth; lunule very narrow, impressed; escutcheon some- 

 what broader, smooth; surface sculpture consisting of widely separated, raised, concentric ridges, 

 thèse become finely tuberculate on posterior half of shells, very fine radial threads also présent ; 

 hinge normal Tellina-ty^ç.. Shell of light yellow colour, nacre shining white. 



Measurements of Holotype : — Length 9 mm., height 5.7 mm., diameter 2.9 mm. 



Habitat: — The unique Holotype was dredged at St. 260 (5°36'.5S., i32°55^2E., 

 90 mètres). 



Remarks: — T. [T.) patagiata is a beautiful species of a small size with a downwardly 

 directed rostrum, and the shell sculpture consisting of sharp ridges separated by broad inter- 

 spaces; the ridges on the posterior half of the shell are thickened and eut up and appear 

 almost tuberculated. 



8. Tellina [Arcopagià) robiista Hanley. 



1845. Tellma robnsta Hanley, Proc. Zool. Soc. London (volume for 1844), p. 63. 



1845. Tellina robiista Catlow 8: Reeve, Conch. Nomencl., p. 25. 



1846. Tellina robnsta Hanley in Sowerby, Thés. Conch., I, p. 252, pi. LVI, figs. 2, 3. 

 1856. Tellina [Arcopagià] robnsta Adams, H. & A., Gen. Rec. MolL, II, p. 397. 

 1860. Tellina robnsta Reeve, Elem. Conch., II, p. 126. 



1868. Tellina [Arcopagià] robnsta Tryon, Amer. Journ. Conch., IV, p. 91. 



187 1. Tellina [Arcopagià] robnsta Rômer in Martini-Chemn., Conch. -Cab. (N. F.), X (4), Tellina, 



p. 89, pi. XXIV, figs. 4—6. 

 1874. Tellina [Arcopagià] robnsta Dunker, Cat. Mus. Godeffroy, V, p. 166. 

 1878. Arcopagià robnsta Bertin, Nouv. Arch. Mus. d'Hist. Nat. Paris, (2) I. p. 321. 

 1880. Tellina [Arcopagià] robnsta von Martens, MôbiusBeitràge Meeresf. Mauritius, Seychell., p. 330. 

 1884. Tellina robnsta Grasset, Ind. Test. Viv., p. 256. 

 1890. Tellina [Arcopagià] robnsta Paetel, Cat. Conch. Samm., III, p. 50. 

 1896. Tellina [Arcopagià] robnsta Casto de Elera, Cat. Sist. Filip., p. 726. 

 1899. Tellina robnsta Hedley, Mem. Austral. Mus., III, pp. 499, 526. 

 1903. Tellina robnsta Smith, Faun. Geogr. Maldive, Laccadive Archipel., II, p. 627. 

 1903. Tellina robnsta Sykes, Journ. Malacol., X, p. 138. 

 1903. Arcopagià robnsta Hidalgo, Obras Malacol., II, p. 152. 



1905. Arcopagià robnsta Hidalgo, Cat. Filip., p. 320. 



1906. Arcopagià robnsta Hedley, Proc. Linn. Soc. N. S. Wales, XXXI, p. 466. 

 1906. Tellina [Arcopagià] robnsta Lamy, Bull. Mus. d'Hist. Nat. Paris, XII, p. 209. 



1909. Tellina [Arcopagià] robnsta Melvill, Trans. Linn. Soc. London (Zool.), XIII, p. 131. 



1910. Arcopagià robnsta Hedley, Austral. Ass. Adv. Sci., XII, p. 350. 



1928. Tellina [Linearia] robnsta Faustino, Summary Philippine Mar., Freshw. MolL, p. 93. 



1929. Tellina [Arcopagià] robnsta Dautzenberg, Faun. Colon. Français., p. 630. 



T. [A.) roèîista is an Indo-Pacific species, and Sowerby 's West Indian Shells, which he 

 figured under this name ^), are incorrectly referred to this species. T. [A.) robusta has a sub- 

 trigonal, greatly inflated shell, having a short, subtruncated beak at the posterior extremity. 

 A few concentric, low striae can be disting-uished on the valves of fresh shells. 



Distribution: — T. {A.) robusta is widely distributed in the Indo-Pacific. 



The "Siboga" Expédition collected shells in the Madura' Strait (St. 2), Bay of Pidjot, 



1) Sowerby, G. B. — In Reeve, Conch. Icon., XVII, Tellina^ pi. XVI, fig. 77 (i 



