92 RHAPHAULUS. 



elirysallis Pfp. (Pfr. in Novit. conch. I. p. 75.— 

 licns. in Anu. and Mag. 2d. ser. XVII I. p. 254. — 

 Cyclost. clirysnUis Pfr. Proc. 1852. p. 158. — Ch. 

 ed. nov. p. 239. t. 31. f. 23. 24. — Miffalomnst 

 chrysnllis Pfr. Mon. Pneum. n. 11. — Crny Phan. 

 p. 92. — j4d. Gen. p. 284. — Anmiliis chri/sallis 

 Bens. in Ann. and Mag. 2d. ser. XVII. p. 342. — 

 Specirnen perfectum , prope Maulmain imperii Bir- 

 mani lectuni colore castaneo , tuboque elongato su- 

 turali praeditum est, teste Cl. Benson 1. c.) . . . Mon. p. 131. 



XIIL Streptaulus Benson. 



Testa umbilicata pupiniformis, nitens ; peristoma circulare, 

 non continuum, superne tubulo suturali interno et externo, 

 continuo, acl extremitates ambas aperto, siphonem mentiente, 

 perforatum. — Operc. ? 



Streptaulus Bcns. in Ann. and Mag. N. H. 2d. ser. XIX. 1857. 



Genus inter Rhaphaulum et Alycaeum quasi intermedium, 

 textura et colore priori similius et strictura characteristica al- 

 terius omnino carens. *) 



1. S4i*. Blaiafordi Benson. 



T. umbilicata, oblonga, polita, regulariter oblique striata, 

 striis prope suturam submarginatam fortioribus, Hneis non- 

 nullis spirahbus decussatis, fusco-cornea, transhicens; spira 

 convexo-conicn, apice obtusiuscula; anfr. 5 convexiuscuH, pen- 

 ultimus ventricosior ; umbiHcus angustus , impervius; apertura 

 magna, subcircularis ; perist. simplex, reflexum , subrevokttum, 

 marginibus Ciillo parietaH tenui junctis ; tubuli suturalis pars 

 externa longa, pone junctionem labri breviter arcuatim elevata, 

 suturam subtus exhibens. — Long. T^/o, diam. 5 mih. Long. 

 apert. (peristomate inchiso) 4 miH. (Mus. Benson.) 



Sireptaulus lihmfordi Betis. in Ann. and Mag. N.H. 2d. ser. XIX. 

 — — Pfr. Novit. conch. I. n. 230. t. 37. f. 1—3. 



*) In Slreptnulus the tube is first internal, and on arriving at the aper- 

 ture is suddenly reflexed , and instead of forming an opcning in the lip 

 above the aperture as in lihaphaulus bombycimis , or ending in a short 

 upright tube as in R. Lorraini or Chrysallis Pfr.., it decribes a shortarch 

 behind tlie lip , and then runs to some distance along the external suture, 

 as in Alycaeus. (Hens. 1. c.) 



