22 



CONCHOLOGIA INDICA. 



7, 8, 9. IT. Tennentii, Hanley, for Mya corrugata, 

 Wood, General Conch, p. 108, pi. 24, f. 1, 2, 3. 

 " Ceylon." 



Our locality is not well authenticated. The shell 

 was found without name in the Bensonian collection, 

 as from British India. 



10. U. corbis, Benson, in Hanley 's Eecent Bi- 

 valves, p. 386, pi. 23, f. 43. 

 Assam. 



So rare a shell, that we have only seen one perfect 

 specimen. It is a solid little species. 



PI.ATE XLVI. 

 UNIO. 



1. U. scutum, Benson's MSS. in Reeve's Conch. 

 Icon. Unio, f. 510. 



Tenasserim River. 



2. U. scobina, Benson, in Hanley's Recent Bi- 

 valves, p. 382, pi. 22, f. 40. 



Assam; Mysore? 

 The specimen delineated is the almost unique origi- 

 nal type, cleared partially of the ferruginous coating 

 with which it was invested. The Mysore specimens 

 are too worn to be positively pronounced identical. 



.'!. U. scobina ? var. Benson. 

 Fu igaum, Dcccan. 

 A hair link between scobina and occatus. 



1. U. gonerosus, Gould, Proc. Boston Soc. Nat. H. 

 vol. 2, p. 220 ; Otia Conch, p. 201. 

 Tin' shell here delineated was sent by Gould to 

 Uonson as typical ; the alated form referred by us to 

 liimcllatii.s (pi. 9) belongs to it. Except for its dentition, 

 this shell might be referred to the large Birmese form of 

 niarginalis, or even to the Cingalese Thwaitesii. Its 

 allinitios, on the other hand, incline closely to the U. 

 lamoil.'itus of Loa. The peculiar hinder surface, j 

 whicii Gould terms subcostatod, results from a close [ 

 superficial concentric sulcation. I 



.'). f.. U. Bonnoaudi, var. l^ydoux and Souloyot. — | 

 IJcevc, Conoh. Icon. I'nio. f. 51"). ] 

 IVgu. j 

 The sculpture is scarcely so strong in the smooth j 

 vnrioty dcliiicatod as in another of our figures, and i 

 the shading here obscures the radiating sulci in front. : 



7. U. generosus, Gould. v:ir. angustior. i 

 Pegu. 



PLATE XLVn. 

 CYCLOPHORUS and AULOPOMA. 



See previous plates i. ii. iii. iv. xxxiii. xxxiv. 



1, 2. A. grande, Pfeifier, Proc. Zool. Soc. 1855. 

 p, 104: Mon. Pneum. vol. 2, p. 39 : Xovit. Conch, 

 vol. 1, pi. 19, f. 11 to 13. 

 Ceylon. 



3, 4. A. HofFmeisteri, Troschel, Zeitsch. ]\Ialak. 

 1847, p. 43. 

 Ceylon. 



The description referred to is only in German, and 

 very brief. 



5, 6. C. hispidulus, Blanford, Jour. Asi. Soc. Bang, 

 vol. 32 (1863), p. 321 ; Cont. Ind. Mai. pt. 4, p. 3. 

 Mya Leit Doung, near Ava. 

 The spiral hispid ridges of the umbilicus are nor 

 adequately rendered in our lithograph. 



7. C. exul, Benson. An. Xar. Ilist. ser. 2, vol. 14 

 (1854), p. 412.— Pfeif. 'Mon. Pneum. vol. 2, p. 46.— 

 Reeve, Conch. Icon. Cyclop, f. 53. 



Bhamoury, at the foot of the Kohillano- 

 Himalayalis. 

 The delicate shell here depicted is unique. 



8. C. cratera, Benson, An. Xat. Hist. ser. 2, vol. 18 

 (Aug. 1856). — Pfeif. Mon. Pneum. vol. 2, p. 55. 



Ceylon. 



Possibly a form of the annulatus of Troschel. 



9. C. cytopoma, Benson. An. Xat. Ilist. ser. 3, vol. 

 5 (1860), p. 385.— Pfeif. Mon. Pneum. vol. 3. 

 p. 72. 



Ceylon. 



Scarcely ditVers from the previous species, except 

 in fragility and the want of a double lip. 



10. C. tryblium, Benson, var. conica. See plate 

 xlviii. f. 1. 



The typical form is delineated in our next plate : 

 that here represented is remarkable for its narrow- 

 umbilicus and its elevated spire. 



