226 Mr. W. H. Benson on new forms of Cyclostomacea. 



brous cancellation of the inflated part only of the last whorl is 

 an unusual feature, no trace of the spiral rugae appearing else- 

 where on the whorls. 



The origin of the sutural tube is about 4 millimeters from the 

 aperture. The shell has much affinity with the Bornean Alycceus 

 Spiracellum, A. & R., which has a somewhat similar operculum. 

 Dr. PfeifFer informs me that it is an Ahjccevs, and not a Ptero- 

 cyclos, as conjectured by him before he had an opportunity of 

 inspecting the shell. 



3. Ahjccens Amphora, n. s. 



Testa anguste umbilicata, ovato-globosa, exilissime costulato-striata, 

 albido-carnea, versus apicem acutiusculum rubella ; spira conica, 

 sutura subprofunda ; anfractibus 4 convexis, ultimo inflate, juxta 

 aperturam constricto, tubulo suturali longissimo prope peristoma 

 criente ; apertura verticali ; peristomate duplici, continuo, interior! 

 bre^-iter porrecto, intus pallide aurantiaco, exteriori expanso, stri- 

 atulo, incrassato ; umbilico intus spiraliter striate, margine com- 

 pressiuseule. Opercule ? 



Long. b\, diam. obliq. 5 mill. 



Hab. ad Moulmein, et in valle Tenasserim raro. 



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

 the Sikkim A. Urnula, nobis, but has a more globose aspect. 

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

 so far round the 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. 



4. Alyccms sculptilis, n. s. 



Testa late umbilicata, turbinata, subtrochiformi, acute costulata ; spira 

 conica, sutura profunda, apice attenuate, acutiuscule ; anfractibus 

 5 convexis, ultimo ad latus inflate ee cestulis cenfertissimis munite, 

 turn constricto, autice Iseviori, tumide, tubule suturali mediecri, 

 ab apertura remote, incumbente, circa umbilicum obtuse angulate, 

 intus eencaviusculo ; apertura ebliqua, circular! ; peristomate du- 

 plici, interior! subperrecto, iucrassate, margine superne profunde 

 incise, interiori dextrali interne crenulate vel denticulate, externo 

 incrassato, expanse, reflexiuscule, superne iucrassate prominente, 

 ab anfractu penultimo sinu profunde separate. Opercule ? 



Diam. Z\, axis 2\ mill. 



Hab. rare ad Thyet-Mie prepe fluvium Irawadi, nen procul a finibus 

 provincise Burmanicse Britanuicae. 



The specimen is much weathered, and has lost all its colour, 

 so that I am unable to describe that part of its character. It 

 presents a new" form in the genus, and exliibits peculiar cha- 

 racters in the slit inside the aperture at its upper part, and in 



