Quarterly Journal of Conchology. 125 



closely related to the present, indeed I am of opinion 

 that they will prove to be synonymous ; AT. libertina 

 described by Gould in the Proceedings of the Boston 

 Society of Natural History for June 1859; M. Japonica 

 Reeve, Conchol. Icon. December 1859, and M. 

 ambidextra Martens, Malakzool, Blatter 1861. If 

 eventually these forms be united, Gould's name would 

 have to be retained since it has a few months priority 

 to the iriore characteristic one assigned by Reeve. 

 17. Limnaea Japonica y^?>'. —" Found in great profusion in 

 the rice fields this spring. I suppose they are second 

 year shells, which have burrowed in the mud all the 

 winter." This species was described by Jay in the 

 United States Japan Expedition under Commodore 

 Perry in 1856, Vol. II. p. 294, and is badly figured on 

 Plate V. i. 10 — 12. Martens in the Malakozoologische 

 Blatter 1861, Vol. VII. p. 42, gives a more complete 

 description. Sowerby, in the Conchol. Iconica, has 

 again described this species, but fortunately though 

 unaware of the n^xixo. Japonica having been employed, 

 he has made use of it to designate this species. 



The specimens sent by Mr. Goodwin are much 

 larger than that which is figured by Jay ; the largest 

 is 29 mill, in length, 20 m its greatest with, and 14 in 

 the smallest ; the aperture measures 24 long and 15 

 broad. Some specimens were found by Mr. Good- 

 win very abundantly " in a pond which is the feeder 

 of the rice fields at Yokohama." I believe they are 

 but the younger stages of this species. A remarkable 

 monstrosity has the spire deeply sunken within the 

 body whorl like the Irish L. involuta with a very deep 

 sutural canaliculation ; some specimens display dis- 

 tinct malleation, and there is a thin whitish enamel 

 spreading over the columellar portion of the body-whorl. 

 18. Limnaea Goodwinii sp. nov. 

 Testa subovato, anguste perforata, fusco-amiea, parum nitida, spira 

 gradata, -medioci iter elongata ; anfractus 4 — 4]/,, convexi, 

 superne rotunde tabulati, sutura profunda i/npressa scfuncti, 

 incrementi lineis tenuibus et striis minutissimis spiralibus in- 



