144 Mr. E. A. Smith on Land- Shells from the 



the centre of the mass, which now assumes a spherical shape, 

 and becomes connected with a solid string of mesodermal 

 cells, the genital cord, running parallel to the intestine and 

 extending all the way to the posterior wall of the cloaca. 



As the Belgian authors have show^n, from this simple sphere 

 and single cord of cells, testis, ovary, vas deferens, and 

 oviduct are all differentiated later. 



XX. — On a Collection of Land- Shells from the Islands of 

 Selayar, Jampea, and Kalno. By EdGAR A. SmITH, 

 F.Z.S., Assistant-Keeper of Zoology, British Museum. 



[Plate X.] 



The collection about to be described was made by Mr. A. 

 Everett at the end of last year. It contains several new and 

 interesting species. Already nine species of land ]\Iollusca 

 have been quoted from Selayar, but none appear to have been 

 recorded from either Jampea or Kalao. These islands are 

 situated to the south of the large island of Celebes, Selayar 

 being nearest to it and the others nearly midway between it 

 and Flores. 



Some of the species occur on all three of the islands, some 

 on two only, and a few are common to Celebes and Selayar. 



Four have as yet been met with only on Selayar^ three on 

 Jampea, and five on Kalao. Further investigation may show 

 that some of these are not so restricted in their distribution. 



The species recorded from Selayar by E. von Martens * 

 which are not in the present collection are Macrochlamys 

 mijiuta, Amphidromns sultanus [=-perversaj var.j, Stenogyra 

 achattnocea, and Vaginulus viviparus. 



Microcystma consueta. (PI. X. figs. 1, la.) 



Testa orbicularis, depressa, perforata, pellucida, polita ; spira brevis- 

 sime conica ; anfractus 5-f>, convexiusculi, lente accrescentes, 

 infra suturam anguste marginati, ultimus antice baud descendens, 

 ad peripberiam rotundatus ; apertura oblique lunata ; peristoma 

 teuue, ad insertiouem leviter retiexum, supra umbilicum lingu- 

 latim subproductum. 



Diam. maj. 4| millim., min. fere 4, alt. 2. 



Hab. Selayar, Jampea, and Kalao Islands. 



• Max Weber's Zool. Ergeb. \o\. ii. pp. 231, 240, 243, 246. 



