22 



CONCHOLOCxIA INDICA. 



7, 8, 9. U. 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 Recent 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. 



PLATE XLVI. 

 UNIO. 



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

 Icon. Unio, f. 510. 



Tenasserim River. 



2. U. scobina, Ben.son, 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 feiTuginous coating 

 with which it was invested. The Mysore specimens 

 are too worn to be positively pronounced identical. 



3. TJ. scobina ? var. Benson. 



Belgaum, Deccan. 

 A half link between scobina and occatus. 



4. U. generosus, Gould, Proc. Boston Sec. Nat. H. 

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



The shell here delineated was sent by Gould to 

 Benson as typical ; the alated form referred by us to 

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

 this shell might be referred to the large Birmese form of 

 marginalis, or even to the Cingalese Thwaitesii. Its 

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

 lamellatus of Lea. The peculiar hinder surface, 

 which Gould terms subcostated, results from a close 

 superficial concentric sulcation. 



5. 6. U. Bonneaudi, var. Eydoux and Souleyet. — 

 Reeve, Conch. Icon. Unio, f 515. 



Pegu. 

 The sculpture is scarcely so strong in the smooth 

 variety delineated as in another of our figures, and 

 the shading here obscures the radiating sulci in front. 



7. U. generosus, Gould, var. angustior. 

 Peiiu. 



PLATE XL VII. 

 CYCLOPHORUS and AULOPOMA. 



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



1, 2. A. grande, Pfeiffer, Proc. Zool. Soc. 18-^5, 

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

 vol. 1, pi. 19, f-ll to 13. 

 Ceylon. 



3, 4. A. Hofifmeisteri, Troscbel, Zeitsch. Malak. 

 1847, p. 43. 

 Ceylon. 



The description referred to is only in German, and 

 very brief. 



5, 6. C. hispididus, Blanford, Jour. Asi. Soc. Beng. 

 vol. 32 (18G3), p. 321 ; Cont. Ind. Mai. pt. 4, p. 3. 

 Mya Leit Doung, near Ava. 



The spiral hispid ridges of the umbilicus are not 

 adequately rendered in our lithograph. 



7. C. exul, Benson, An. Nat. Hist. ser. 2, vol. 14 

 (1854),p. 412.— Pfeif Mon. Pneum. vol. 2,p. 4G.— ^- 

 Reeve, Conch. Icon. Cyclop, f. 53. n/ (^I 



Bhamoury, at the foot of the Rohillsma— 

 Himalayahs. 

 The delicate shell here depicted is unique. 



8. C. cratera, Benson, An. Nat. 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. Nat. Hist. ser. 3, vol. 

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

 p. 72. 



Ceylon. 



Scarcely differs 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. 



.^■^^ 



