Dr, Philippi on the animal of Pileopsis Garnoti. 91 



front and inferior part is easily distinguished from the upper 

 thicker part. Ei/es are distinct on the outside of the head. 

 The perfect mantle surrounds the whole shell, presents no 

 incision, no siphon, and between it and the oval foot there is 

 not a single organ to be found. A specimen thrown into spi- 

 rits gave more information respecting the internal structure 

 as the intestines shine through the thin peritoneum. The en- 

 tire hinder space of the body was occupied by the brown liver, 

 as also a part of the right side ; the ramified processes of the 

 liver could be plainly distinguished on it. To the right was 

 situated a reddish organ, probably the ovarium. Above the 

 liver, posteriorly and to the left, is situated the intestinal canal 

 with a convexity directed backwards and bending anteriorly 

 and to the right, it disappears before the right end of the 

 muscle which fastens the animal to the shell ; in front of the 

 liver is moreover situated a white organ, the functions of which 

 I do not venture to indicate ; and in front of this, occupying 

 nearly half the space, appears a cavity, in which an organ with 

 a form closely resembling a folded ruff proceeds nearly par- 

 allel with the intestinal canal, and above is adherent to the 

 peritoneum and is evidently the branchia. I now also suc- 

 ceeded in passing a hair through this hole exteriorly, which 

 even appears in front on the right side before the anal aper- 

 ture in the rather thick border of the mantle, where on more 

 accurate examination I found a small black point. On ac- 

 count of the minuteness of the animal no separate anal aper- 

 ture and branchial aperture can be perceived externally. I 

 could not discover an orifice for the sexual apparatus. After 

 I had found this out it was easy for me to notice on the 

 few shells at my disposal that they are somewhat promi- 

 nent in the vicinity of the branchial aperture. From the 

 irregularity of the shell it requires great attention to discover 

 it. But to what genus does the animal belong ? This is a 

 question which, from the entire want in this place of literary 

 auxiliary means, I am not able to answer. The first thought 

 is on Siphonaria, but as far as I can recollect, the horseshoe- 

 like impression of the muscle is interrupted in this genus by 

 the siphon; in the present species the right arm of the horse- 

 shoe is merely shorter than the left. Moreover the animal is 



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