BY H. LEIGHTON KESTEVEN. 469 



whorl sculptured with two or three spiral threads, and very fine 

 transverse striae. This apex is absolutely undefined. I agree 

 with Tate in considering its termination to be a little anterior 

 to the first appearance of sculpture. 



LoTORiuM CYPRUS, Tate, sp. 

 (Plate xvii., fig. 6.) 

 Triton cyphus, Tate, op. cit. p. 119, pi. v., f. 11. 



Apex of one and one-half whorls, polished; nucleus slightly 

 mammillate, but placed centrally; the anterior whorl sculptured by 

 a distinct median and two postero-median spiral threads, and by 

 transverse growth-striae. 



This protoconch is defined by the acquisition of the numerous 

 spiral lirse with which the adult shell is ornamented. 



LOTORIUM ANNECTANS, Tate, Sp. 



Triton annectans, Tate, op. cit. p. 121, pi. v., f. 3. 



" The protoconch of this species is similar to that of L. torti- 

 rostris in being somewhat elevated, roundly turbinate, and spirally 

 striated; it is composed of three and one-half to four whorls, and 

 the striae, which are four in number, equidistant and very pro- 

 nounced, decrease in size on being traced backwards; the top of 

 the larval shell is extremely minute and central " (Harris, I.e., 

 p. 192, pi. vi., f. 7). 



LoTORiuM OLiGOSTiRUM, Tate, sp. 

 (Plate xvii., fig. 7.) 

 Triton oligostirus, Tate, op. cit. p. 126, pi. vi., f. 7. 



Apex normal, of three polished whorls, nucleus slightly de- 

 pressed, first two whorls smooth, thence an ornamentation of four 

 spiral threads and oblique growth-striae is gradually developed. 

 At the termination of the embryonic shell the structure changes 

 completely. 



Compare with this Watson's description of the apex of Lotorium 

 philomelce. .^^^^'^^''^''7^^ 



. • - "^' >• 



