DIPT/JMM.VTIXA. 



319 



489. Diplommatina hiittoni, Pffiffc-. 



Biplommatina hxiUoni, Pfeiffer, Zeits. Malak. viii, 1851, p. 148 

 (noiu. nud.); id., Proc. Zool. Soc. 185i>, p. 157; id., Mon. 

 Piieiim. 185i', p. 123; id., Cat. Pluimnopn. Brit. Mus. 18o2, p. 86 ; 

 id., Concli.-Cab., Cvclostoniaceen, 1854, p. 389, pi. 48, figs. 36, 

 37; Adams, ^^n. Rec. Moll, ii, 1856, p. 287; CJuppy, 

 A. M. M. II. ser, 3, xx, 1867, p. 95 ; Blanford, A. M. N. IT. ser. 4, 

 i, 1868 p. 110; llanlev & Tlieobald, Conch. Ind. 1875, pi. 139, 

 fi^s. 5,6; Theobald, Cat. Shells Brit. India, 1870, p. 42 ; Xevill, 

 ifand List, i, 1878, p. 2S7 ; Godwin-Austen, Laud & Freshw. 

 Moll. India, i, 1886, p. 170, pi. 45, figs. 7, 7 a, 7 ft. 



Diplommatina {Eudiplommufina) huttoni, Kobelt & Miillendorff, 

 Nachr. Dents. Malalc. Ges. xxx, 1898, p. 137 ; id., Cat. Pneum. 

 1899, p. 57. 



Dijifommatina {Diphmmatina) hutfoni, Kobelt, Uas Tieiveich, 

 Lief. 16, 1902, p. 435. 



Original description:—''!), testa sinistrorsa, subrimata, ovato- 

 conica, eleganter confertim et oblique costulata, diapbana, albida ; 

 spira conica, acuta ; anfract. 6 perconvexLs ; apertura subcirculari ; 

 perist. duplice, expanse. 



" Loiis. 2h, diain. 1 mill."' {Pfeiffer.) 



Godwin- Austen {I. c.) gives the following measurements :— Major 

 diam. 0-S3 ; alt. axis I'O mm. 



Hah. India : Mussoorie, N. AV. Himalayas (Godivin-Anstcn). 

 In 1867 the late R. J. Lecbmere Cruppy recorded the finding of 

 this species in Trinidad, suggesting its migration — together with 

 Ennea hicolor, Ilutton— across the Tertiary Atlantis. The late 

 William Blanford discussed this question at great length in 1868 

 (Zoc. cit.) and suggested the possibility of these molluscs having 

 been transported with living plants, as others are well known thus 

 to have been transported. Lieut.-Col. Godwin-Austen has com- 

 pared specimens of D. huttoni, from the typical locality Mussoorie, 

 with eighteen specimens from Trinidad, lent to him by the late 

 Sir Rawson Rawson, and he found that the two forms were 

 speciiically distinct, and he has renamed and described the 

 Trinidad shell as J), occidentalis *. 



The question, however, as to which of the Indian species has 

 been transported to America still remains unsolved, if the 

 Trinidad form assimilated to any of the known species, Lt.-Col. 

 Godwin-Austen, with his intimate and extensive knowledge of 

 the Indian Tauna, would have been able to detect it. The 

 Western Hemisphere being altogether outside the range of this 

 o-enus, there can be no doubt that the species must have been 

 carried across through human agency. The well-known case of 

 Ealota simikiris may be cited in this connection, tl.is species 

 having become distributed by similar means over a great part of 

 the world. {Cf. Fauna Brit. India, Mollusca, vol. ii, 1914, p. 201.) 



* Land & Frcslnv. Moll. India, i, 18SG, p. 173. pi. 45, iU^s. 8, 8a, 8 A. 



