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



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



Fig. 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. Turbdidea nodosa, dorsal and basal views. Mus. Carter. 



Fig. 15. Trochodon cancellatus, two varieties. 



Fig. 16. Gihbula levistriata. 



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

 preserved. 



Fig. 18. Crepidula Cooksonice, 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 Pyramidellid?e 

 from the North of China. By Arthur Adams, F.L.S. &c. 



Every additional observation I make on the animals of the 

 genera of Pyramidellidce induces me to believe that there is a 

 very intimate relationship between the families Pyramidellidce, 

 Actaonidce, and Bullidce. 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 Philippics 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 

 veiy nearly agrees with Moller'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, carneo-fusca, apice obtuso ; 

 anfractibus 5, convexiusculis, transversim sulcatis, suicis distanti- 

 bus, interstitiis simplicibus ; anfractu ultimo magno ; apertura 

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

 obliqua, vix celata. 



Hab. Hulu-Shan Bay ; 4 fathoms. 



