396 Mr. A. Adams on new Mollusca from China. 



3. Monoptygma punctigera, A. Adams. 



M. testa subulata, sordide alba, tenuicula; anfractibus 6, planis, 

 transversim sulcatis, sulcis subconfertis, interstitiis valde punctatis ; 

 apertura ovato-oblonga, postice acuminata, antice latiore et rotun- 

 data ; plica parietali obliqua, conspicua. 



Hab. Gulf of Pe-chili ; 5 fathoms (sandy mud). 



4. Monoptygma sulcifera, A. Adams. 



M. testa pyramidali-ovata, alba, opaca, solidula ; anfractibus 5, 

 planis, transversim sulcatis, sulcis profundis, confertis, interstitiis 

 simplicibus ; anfractu ultimo elongato, magno, antice angustato ; 

 apertura oblouga, antice producta et acuminata ; plica parietali 

 obliqua, superiore, vix celata. 



Hab. Gulf of Pe-chili ; 5 fathoms (sandy mud). 



5. Monoptygma cingulata, A. Adams. 



M. testa turrito-subulata, solida, alba ; anfractibus 7|, planis, cin- 

 gulis transversis elevatis subdistantibus ornatis ; apertura sub- 

 quadrato-oblonga ; plica parietali valida, mediana, transversa, 

 conspicua ; labro rectiusculo, intus lirato. 



Hab. Hulu-Shan Bay ; 3 fathoms. 



This species is by no means typical, and should form a sub- 

 genus under the name of Oscilla. 



Genus Menestho, MoUer. 

 Menestho subula, A. Adams. 



M. testa acuminato-subulata, alba, Isevi, opaca, nitida ; anfractibus 7|, 

 planis ; apertura ovata, antice dilatata, postice acuminata ; plica 

 parietali obliqua, superiore, conspicua. 



Hab. Hulu-Shan Bay ; 3 fathoms. 



The animal agrees with Holler's account of M. albula, having 

 a narrow elongated foot, and very small eyes at the inner bases of 

 the tentacles ; but the tentacles are longitudinally folded, which 

 may be implied in his expression " crassiusculis." The part 

 termed the mentum by Loven is very long, and extends from 

 the head as far as the front of the protruded foot. The oper- 

 culum is small, thin, horny, and subspiral. 



Genus Syrnola, A. Adams. 



Syrnola unilineata, A. Adams. 



S. testa parva, subulato -pyramidali, fulva ; anfractibus normalibus 4, 

 planatis, ultimo magno, ventricoso, ad peripheriam rotundato, et 

 linea unica rufo-fusca circumcincto ; apertura late ovata ; plica 

 parietali mediana, conspicua ; labro simplici, acuto. 



Hab. Lo-Shan-kow, Shan-tung. 



