Mr. E. A. Smitli on the Genus Pytliina. 233 



divaricating sculpture, the form of the genus Modiola, and is 

 covered with a peculiar setose epidermis. A specimen from 

 the ' Porcupine' expedition, presented to the British Museum 

 by Dr. Jeffreys under tiie name of Pythina setosa, appears to 

 be the young of Kellia Alacandrewi, Fischer, which, according 

 to the dentition, agrees with Montacuta, having only a distinct 

 anterior tooth in each valve, tiie posterior one, which is more 

 evident in Tellimya^ being obsolete. 



15. ^^ Pythina Geoff royi^ Payraudeau," Jeffreys. 



Pythina Geoff royi, Pavr., Jeffreys, Proc. Zool. Soc. 1881, p. 694. 



llah. Mediterranean, Atlantic. 



This ?pecies has no divaricate sculpture and is usually 

 located with the typical forms of Kellia. 



16. Pythina Cuminrjii^ A. Adams. 

 Pythina Cumingii, A. Adams, Proc. Zool. Soc. 1856, p. 47. 



Hah. Island of Bohol, Philippine Islands. 



This species has almost the sam.e dentition as Lepton ; 

 indeed, the difference is so slight as to be of no importance. 

 In Lepton the hinge is composed of a pair of teeth-like 

 laminas on each side of a central excision of the hinge-plate 

 in tlie right valve ; in the left there is a small cardinal in 

 front of the cartilage-pit and on each side a single lateral 

 which fits in between the laterals in the opposite valve. In 

 the present species the small cardinal of the left valve is 

 wanting or consolidated with the base of the anterior lateral. 

 Another feature in which the present species agrees with 

 Lepton is the fine punctuation which occurs on both the 

 anterior and posterior dorsal areas, a feature unnoticed by 

 Mr. Adams in his brief diagnosis. 



17. Pythina Iwvis, Carpenter. 

 Pythina Icsvis, Oarpeuter, Cat. Mazatlan Shells, p. 112. 



Hah. Mazatlan. 



An examination of this species shows that it should be 

 placed in Tellimya and that its nearest ally is T. paula^ A. 

 Adams. Carpenter correctly observes, " The character of the 

 liinge seems more related to Montacuta than to Kellia^ Tiie 

 elongate, very slender, lateral teeth he mentions are of no 

 importance. 



