154 OPEAS, COMORO IS., ETC. 



ally tapering; aperture oblong, base rotund, peristome sim- 

 ple, unexpanded, exterior margin evenly arcuate, columellar 

 margin narrowly reflexed. Length 10-11, diarn, 4-4 1 /4 mm. 

 Length of aperture 4, breadth 2 mm." (Morelet) . 



Comoro Islands : Johanna ( Anjuan) (Bewsher) and Mayotte 

 (Marie). Also Nossicumba( Marie), and Nossi-Be (Stumpff). 



Bulimus (Stenogyra) johanninus MORELET, Journ. de 

 Conch., Oct. 1877, p. 333, pi. 12, f. 3. Opeas johanninus 

 (Mor.) BOETTGER, Nachrbl. 1890, p. 90. CROSSE, Journ. de 

 Conch. July, 1881, p. 201. Stenogyra jokannina MORELET, 

 Journ. de Conch. July, 1881, p. 219; J. de C. Oct. 1885, p. 

 293. 0. johanninus CROSSE & FISCHER in Grandidier, Hist 

 Phys. Nat. et Politique de Madagascar, 1889, xxv, pi. 24, f. 2. 



Morelet writes as follows: It differs from B. mauritianus 

 Pfr., known to me only by the description and figure, in the 

 height, the texture of the shell, by the fullness of the whorls 

 of the spire which gives it a more foulimoid form, the aper- 

 ture is also a little wider, and the apex more obtuse. 

 B. johanninus is distinguished by a quite swollen spire, of 

 which the last two whorls are longer than the rest of the 

 shell. It is found in great abundance in dry places on the 

 shore. The specimens collected at Mayotte by E. Marie are 

 more slender and do not exceed 6x3 mm. Boettger, writ- 

 ing of Nossi-Be specimens, says that the species belongs to 

 the immediate group of 0. clavulinus P. & M., but is sharply 

 distinguished from that 'by the greater size, more conic shape, 

 more rapidly increasing whorls, and especially by the rela- 

 tively much higher aperture. But the 0. clavulinus of 

 Boettger is evidently not the species so identified by von 

 Martens and the writer, but apparently is 0. javanicum 

 (Rve.). 



The specimens before me from Nossi-Be (pi. 23, fig. 20), 

 received from E. Marie, are evidently related to 0. mauri- 

 tianum, but are more conic, and differ by having a sculpture 

 which in places may be termed closely, irregularly, arcuate- 

 etriate; but elsewhere would be better described as closely 

 but irregularly grooved. The sculpture is much less dense 

 than in 0. javanicum. The larger shells measure, length 



