NATURAL SCIENCES OF PHILADELPHIA. 41 



fig. 8.) The lingual membrane has also the same general arrange- 

 ment as in that genus, with specific differences from that of A. 

 patula (see plate YII., fig. a-c), especially in the widely expanded, 

 blunt median cusp, and in the Sicccinea-\ike cutting away of the 

 lower margin of the teeth. 



The nervous ganglia are as usual in the Geophila, forming a 

 continuous ring in the supraoesophageal, and grouped together in 

 one mass in the suboesophageal set. 



Plate YIII., fig. 3, gives the central and adjacent lateral teeth, 

 with marginals at different intervals to the edge of the membrane. 



The notes we have given above will enable a full generic descrip- 

 tion of the genus Amphibulima to be drawn. 



Gonospira and Nanina, from Mauritius. 



Having received from the Museum of Comparative Zoology at 

 Cambridge a number of specimens in alcohol of Mauritius species, 

 collected b}' Consul Pike, we are able to give the following notes 

 on them. 



Gonoftpi7-a. There were several species of this and the allied 

 subgenera, allowing an examination of their anatomy. The soft 

 parts of the animals are colored red. The species especially 

 examined are G. Newtoni, H. Ad,, and G. palanga, Fer. There 

 seems nothing in the anatomy different from what is usual in the 

 land shells. The genitalia of G. Neiotoni are figured on plate VIII., 

 fig. 7. There are no accessory organs. The genital bladder is 

 long, oval, with a long, narrow duct. The penis sac is stout, long, 

 receiving the vas deferens at its summit, at which point, also, the 

 retractor muscle is inserted. The vagina is long, the oviduct not 

 convoluted. The ovary tongue-shaped as usual. The epididymis 

 is short, the testicle as usual lies in the liver. 



G. palanga has a similar genital system. There appears no 

 locomotive disk and no caudal pore. 



The lingual membrane of the genus has been photographed by 

 Mr. Bland and myself (Am. Journ. of Conch., v. pi. xi. fig. I). 

 All the species now received have similar dentition. There is, 

 however, a difference in the number of teeth in each transverse 

 row. I counted about 37-1-37 in palanga; 6-1-6 in G. Newtoni; 

 12-1-12 in G. mauritiana^ Morelet ; 25-1-25 in G. modiolus, Fer. 

 (Gibbulina, v. Martens). The dentition of this species is also 

 described by Semper (Nachr. Mai. Ges., II. 103). 21-1-21 in G. 



