Mr. A. Adams on new Mullmca from China. 295 



Fig. 11. Solarium planum, enlarged twice, from wax impressions. 



Hg. 12. Solarium Carteri, ventral view, enlarged twice, from a wax impres- 

 sion ; dorsal view from a specimen with the nacreous layer 

 phosphatized. 



Fig. 13. Nerita scalaris, dorsal and spiral views. Univ. Mus. 



Fig. 14. Turho'idea nodosa, dorsal and basal views. Mus. Carter. 



Fig. 15. Trochodon cancellatus, two varieties. 



Fig. 16. Gibbula levistriata. 



Fig. 17. Pleurotomaria semiconcava, last whorl with the shell partially 

 preserved. 



Fl^. 18. Crepidula Cooksonia, lateral and posterior views. 



Fig. 19. Galericulus alius, front, back, and side views. 



Fig. 20. Acmcea tenuistriata [the striae are much too strong]. 



Fig. 21. Tornatella pyrostoma [the mouth should have been wider]. 



Fig. 22. Stomatodon politus [the anterior tooth should have been larger]. 



XXXV. — On a new Genus and some new Species of Pyramidellidae 



from the North of China. By Arthuk Adams^ F.L.S. &c. 

 Every additional observation I make on the animals of the 

 genera of Pyramidellida induces me to believe that there is a 

 very intimate relationship between the families Pyramidellidce, 

 Actaonida, and Bullida, The other day, when observing a lively 

 animal of my little group Syrnola, I was pleased to see the ear- 

 shaped folded tentacles laid flat back and expanded, resembling 

 very much Philippi's figure of Actaon. Although I have met 

 with the shell of Monoptygma striata several times in the Gulf 

 of Pe-chili, I have never yet succeeded in procuring the animal 

 alive or dead. A moUusk closely allied, however, and which I 

 believe to be a new species of Menestho, has an animal which 

 very nearly agrees with MoUer^s description of M. albula. My 

 beautiful, smooth, white species of Myonia [M. virgo) is a third 

 species of Menestho, 



Genus Monoptygma, J. Lea. 



1. Monoptygma vittata, A. Adams. 



M. testa turrito-subulata, gracili, solidiuscula, flavidula ; anfractibus 

 8|, planatis, transversim crebre striatis, fasciis duabus rufis spira- 

 libus eleganter vittatis ; apertura oblonga ; plica parietali obliqua, 

 inconspicua. 



Hab. Hulu- Shan Bay; 3 fathoms, 



2. Monoptygma metula, A. Adams. 



M. testa subulato-conica, solidiuscula, cameo-fusca, apice obtuse ; 

 anfractibus 5, convexiusculis, transversim sulcatis, sulcis distanti- 

 bus, iuterstitiis simplicibus ; anfractu ultimo magno ; apertura 

 elongato-ovata, postice acuminata, antice producta ; plica parietali 

 obliqua, vix celata. 



Hab. Hulu-Shan Bay ; 4 fathoms. 



