573 



30. Bulla Cecillii (pi. cxx. f. 2'Z), Philippi. 



B. testa ovato-cylindrica, Isevi^ tenui, epidermide olivacea tecta, 

 lougitudinaliter substriata; spira distincta, elevatiusculaj anfrac- 

 tibus qainque, sutura corrugata ; apertura angusta, antice valde 

 dilatata ; columella arcuata, simplici. 



Shell ovately cylindrical, tliin, smooth, covered with an oHva- 

 ceous epidermis, longitudinally substriated ; spire distinct, rather 

 elevated, whorls five, suture corrugated; aperture narrow, an- 

 teriorly widely dUated ; columella arched, simple. 



Mexico. Mm. Hanley. 



31. Bulla Borneensis (pi. cxx, f. 23), Adams. 



B. testa ovato-cylindrica, lavi, subpellucida, alba, epidermide 

 ferrugiuea tectii, lougitudinaliter striata; spira distincta, plana, 

 anfractibus quatuor, rotuudatis, primo mammillato ; apertura an- 

 gusta, antice dilatata; columella longa, semitortuosa ; umbdico 

 nuUo. 



A much smaller shell than B. Cecillii. It is narrower, more 

 cylindrical ; the aperture is more produced anteriorly ; the colu- 

 mella is longer and straighter, and the spire is more depressed. 

 The mud flats at the mouths of many of the rivers of Borneo are 

 partially covered at low water with tliis animal; the shell is 

 always covered, when the animal is alive, with a rust-coloiu'ed epi- 

 dermis. 



Borneo. Adams. 



Sub-genus Akera. 



32. Bulla soluta (pi. cxxl f. 40), Chemnitz, Mart. Hist. 

 Conch. X. t. 46. f. 1359-61. Ceylanica, Brug. Enc. Meth. vol. i. 

 p. 376. B. resiliens, Don. B. flexilis, Brown. 



B. testa subcybndrica, lougitudinaliter striata, cornea, dia- 

 phana ; sutm-is canahculatis ; labro antice fisso. 



Shell subcylindrical, longitudinally striated, horny, diaphanous; 

 sutures charmeUcd, outer lip anteriorly sinuated as if cut off'. 



Zanzibar. T. Thome, Esq. Sandy mud ; Philippines. Cuming. 



33. Bulla bullata (pi. cxxi. f. 41), Akera bullata, Milller, 

 Zool. Dan. p. 242. Icon. tom. ii. t. 71. f. 1-5. B. fragihs, Lamarck. 

 A. Akera, Gtn. B. norvegica, Brug. B. soluta parva, Ch. 



B. testa subovata, peUucida, la^vi, cornea ; labro superne soluto; 

 spira truncata. 



