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 Alyc<2us 

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

 Dr. Pfeificr informs me that it is an Alyc^eus, and not a Ptero- 

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

 inspecting the shell. 



3. Alyccms Amphora, n. s. 



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

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

 sutura subprofunda ; anfractibus 4 convexis, ultimo inflate, juxta 

 aperturam eonstricto, tubulo suturali longissimo prope peristoma 

 oriente ; apertura verticali ; peristomate duplici, continuo, interiori 

 breviter porrecto, intus paUide aurantiaco, exteriori expanse, stri- 

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

 pressiusculo. Operculo 1 



Long. 5^, 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. Urnuia, 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. Alyccsus sculptilis, n. s. 



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

 conica, sutura profunda, apice attenuate, acutiusculo ; anfractibus 

 5 convexis, ultimo ad latus inflate eo costulis confertissimis munito, 

 turn eonstricto, antice Iseviori, tumido, tubulo suturali mediocri, 

 ab apertura remote, incumbente, circa umbilicum obtuse angulato, 

 intus concaviuscule ; apertura ebliqua, circulari ; peristomate du- 

 plici, interiori subporrecto, incrassato, margine superne profunde 

 inciso, interiori dextrali interne crenulato vel denticulato, externo 

 incrassato, expanse, reflexiusculo, superne incrassato prominente, 

 ab anfractu penultimo sinu profundo separate. Operculo ? 



Diam. 3^, axis 2^ mill. 



Hab. rare ad Thyet-Mie prope fluvium Irawadi, non procul a finibus 

 provinciae Burmanicse Britanniose. 



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 exhibits peculiar cha- 

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



