NATURAL SCIENCES OF PHILADELPHIA. 43 



The suboesophageal ganglia consist apparently of six closely 

 agglomerated globules. There are two simple globules to the 

 stomacogastric ganglia. The genital system (pl.VIII. fig. 5) is quite 

 simple, presenting no accessory organs. Tlie testicle is composed 

 of six or seven fasciculi of long cseca, which massed together in a 

 globular form equal the length of the oviduct. This enormous 

 development of the testicle is the peculiarity of the genital sys- 

 tem, and no doubt will prove a reliable specific, but not generic, 

 character. The epididymis is long, convoluted at its middle por- 

 tion. The oviduct is long, narrow, not convoluted. The vagina 

 is about one-fifth the length of the oviduct; it is swollen greatly 

 at the entrance of the penis. The genital bladder is small, glo- 

 bular ; its duct is narrow, longer than the oviduct, and enters the 

 vagina at the upper fourth of its length. The penis sac is short, 

 stout, blunt at apex, where the vas deferens enters and where the 

 retractor muscle is also inserted. 



In the paper referred to above we hesitated to decide upon the 

 generic position of this species, leaving it temporarily in Pellicula 

 of Fischer (not of Heynemann, which is Omalijnx). Since that 

 time I have become acquainted with the jaw of Aniphibulima, and 

 find it to be of the same tj-pe as in appendicidata. I would, there- 

 fore, suggest that this species belongs to Amphibulima. It is true 

 its lingual dentition (see pi. VIII. fig. 6) more closely resembles that 

 of Simpulopsis sulculosa as far as centrals, and perhaps laterals, 

 are concerned; but in the marginals, as described in S. sulculosa 

 and S. Potiornceyisis, the resemblance ceases. Moreover, the jaw 

 of Simpulopsis is described as quite diff"erent by Shuttleworth. The 

 species under consideration cannot, therefore, be placed in Si7n- 

 pulopsis. It appears, at all events, that the shell in this group is 

 an unreliable guide to generic position. 



It must be borne in mind that I here describe the anatomy of 

 the shell figured by us (I.e.). We believe it to be Succinea ap- 

 joendiculata, Pfr. Fischer bases his genus Pellicula on Succinea 

 depressa, Rang. He does, indeed, place S. appendiculata, Pfr., in 

 the synonymy of his species, but our specimens of appendiculafa 

 could never be the same as Fischer's specimens of depressa. His 

 had a jaw with nine decided ribs, denticulating the cutting edge, 

 and teeth^ of the usual form of Eelicinae^ quite different from what 



In Fischer's plate the references to teeth of Omalonyx unguis aud Pel- 

 _ licula depressa are reversed. 



