ACADEMY OF NATURAL SCIENCES. 



179 





N. Mejkanus, Behr. 



A1<B supra fulvse, marginem versus bruuneae, fasciis maculisque ordinariis om- 

 nibus albis nigro marginatis instructae. Subtus alse anteriores fulvse, apice et mar- 

 gine grisescentes, fasciis et maculis ut supra. Alse postenores grisescentes, niaca- 

 lis albis et nigro marginatis et eonfluentibus cum colore universali irregulariter 

 variegatae. 



The most positive and striking points of difference would be thus: 



]. A T . Dumeti. Fore wiugs alone show a fulvous coloration on the upperside. 

 Bands and spots perfectly white. 



'2. N. Mejicanus. All wings are occupied with it, till beyond the second band, 

 where the brownish coloration of the margin begins; Bands and spots perfectly 

 white. 



3. N. Virgulti. Extension of the fulvous as in the preceding, but all the space 

 more or less occupied by black. Middle band nearly altogether fulvous, other 

 bands and spots white. 



As much as we know, the type of this genus N. Lucina L, was the only species 

 known heretofore, and it is another proof of the various repetition of types on 

 occidental coasts, that we have to add three Pacific representatives of a genus first 

 discerned iu a single European species. 



The group of the Erycinides belongs essentially to tropical America. The 

 beforementioned Nemeobius Lucina is the only European representative of this nu- 

 merous and polymorphous group. Besides this, there exisl some few Asiatic 

 members of this family, very aberrant in their type, scarcely known and insuf- 

 ficiently examined, so that possibly they may belong somewhere else. In America 

 the tropical genera Nymphidia and Lemonias, extend beyond the Cancer on the 

 Atlantic side ; but on the Pacific side reappears the European genus Nemeobius, 

 extending into the Tropics, and seems to find here its very ceutre. 



Description of New Species of Land Shells. 



BY W. NEWCOMB, M.D. 



Helix Blakeana, Newc. 



Hel. testa unicolor flavido-alba, rotundato, semi-globosa, nitida, translucida ; 

 umbilico amplo, profundo et parum obtecto ; apice obtuso ; anfrautibus sex, con- 

 vexis, tribus superioribus sub-planis, reliquiis rapide accrescentibus, ultimo in- 

 flato ; sutura bene impressa ; apertura rotundato-lunare ; peristomate tenue, ex 

 panso-reflexo cum columella sub-late dilatata, non adnata. 



Alt. '7 pol., Diam maj. PI pol., miu. P pol. 



Hab. Insula Niphon — Japan, (teste Blake). 



Shell uniformly yellowish white, rounded, half globular, shining, translucent, 

 umbilicus large, deep and slightly covered ; apex obtuse; whorls six, convex, the 

 three first nearly on the same plane, the balance rapidly increasing, the last 

 swollen; suture well marked ; aperture roundly lunar; lip thin, flatly reflected, at 

 the columella broadly dilated but not adherent. 



