MOLLUSCA OF INDIA. 429 



of species: "1 juvenile or possibly different species." This shell 

 is inr.eresting, it extends the range of the subgenus Dioryx so much 

 more to the eastward of the Iravvudi Valley — and I introduce it 

 here, although beyond the limits of British India. 



Alycetts (Dioryx) amphora, Benson. (Plate CLIII. figs. 11, 

 11a, 11 b.) Blf. Coll. jS'o. 23.06.5.5 B.M. Type of the genus. 



Benson, A. M. N. H. xvii. (1856) p. 226, ser. 3, vii. Jan. 1881 ; 

 Hanley & Theobald, Couch. Ind, 1870, p. 38, pi. xci. figs. 2, 3; 

 Theobald, Cat. Supp. 1876, p. 37 (Farm Caves, Kaugun) ; G. jSTevill, 

 Hand-list, i. 1878, p. 292 (Kargan, nr. Moulmein) ; Novit. Conch, 

 vol. i. pi. 35. hgs. 15, 16. 



Original description : — " Testa anguste umbiUcata, ovato-globosa, 

 exilissime costalato-striata, albido-carnea, versus apicem acutiusculam 

 rubella ; spira conica, suiura subjyrofunda ; anfractibus 4 convexis, 

 ultimo injiato, juxta apertura,m coastn'cto, tubulo suturali longissimo 

 prope peristoma orieute ; apertura verticali ; peristomate duplici, 

 CO ntinuo, inter iori breviter p)orrecto, intus palhde aurantiaco, exteriori 

 exp>anso, striatulo, incrassato ; umbilico intus spiraliter striato, 

 inargine compressiuscalo. Operculo ? 



" Long. 5^, diam. obliq. 5 mill. 



" Hab. ad Moulmein, et in valle Teuasserim rare. 



" The shell occurs also of a smaller size. It approaches in form 

 the yikkim A. urnula, nobis, but has a more globose aspect. The 

 extreme length of the sutural tube is remarkable ; it extends so 

 far round tbe last whorl as to be visible from the front on both 

 sides of the shell. The aperture occupies about half the height of 

 the specimen." 



In Ann. Mag. Nat. Hist. Jan. 1861, Mr. Benson says: — "A 

 curious variety of Algcceus amphora was sent to me from Moulmein 

 by Major Sankey. Besides a strong angulation at the lower part 

 of the last whorl, the shoulder of that whorl is also distinctly 

 ungulate, almost giving the appearance of a new species ; but the 

 other characters of the shell prove it to be merely a variety. It 

 was found at the Farm Caves by Capt. Haughton." 



The sculpture of this species is to be noted. As far back as the 

 length of the sutural tube, which in the specimen drawn, taken 

 from the Blauford Collection, is 4 mm. in length, very fine, close, 

 regular costulation is met with, immediately followed by a smooth 

 surface having very tine longitudinal liration at irregular distances 

 The base of the last whorl is angulate around the umbilical region, 

 the liration becoming within it quite strong and coarse. In this 

 species the formation of the sutural tube is well shown. The tube 

 and the fine costulation on the swollen portion of the last whorl are 

 formed and advance together (vide fig. 11 6), and apparently as 

 soon as the animal has reached the stage of secreting the tube, 

 some retardation, caused perhaps by the extra building work laid 

 upon it, produces an intermittent thickening of the shell, exhibited 

 by successive close costal. 



