Mr. A. Adams on neir species of Siuusigera. 



125 



which I observed it (both in the pujja and imago state) in con- 

 siderable abundance at the Feijaa de Corte, early in August 1850. 



EXPLANATION OF THE PLATES. 



Plate IV. 



1. Misoleptus Maderensis, JV. 



2. Exetastes peregrinus, IV. 



3. Ephialtcs lateralis, IV. 



4. liueatus, IV. 



5. Lissouota dorsalis, IV 



6. Perilitus debilis, W. 

 7- Scelio minor, fr. 



8. Ceraplirou parvulum, IV. 



Plate V. 



1. Dilophus Maderse, IV. 



2. Scato])se tristis, W. 



3. Tliercva nana, IV. 



4. Paragus niundus, W. 



5. Tetanocera inclusa, JV. 

 (5. ? Walkeri, IV. 



7. Drosophila replcta, JV. 



8. Osciais signata, JV. 



9. G3Tnnopa clara, IV. 



XIII. — Notice of three new species of Sinusigeraj a rjenus of 

 Brachiocephalous Mollusks. By Arthur Adams, F.L.S. &c. 



To the Editors of the Annals of Natural History. 

 Gextlemex, Hong Kong, Nov. 12th, 1857- 



While traversing the Indian Ocean and China Sea, on our 

 passage from the Cape to Hong Kong, the towing-nct was put 

 over whenever the state of the weather and the speed of the 

 vessel permitted. By this means a slender linear area of those 

 portions of the surface of the high seas crossed by us was im- 

 perfectly examined. The results of such limited investigation 

 have already enabled me to make you acquainted with several 

 veiy interesting forms of pelagian Mollusks ; and I now avail 

 myself of your pages to notice the existence of three new species 

 of the Siuusigera of D'Orbigny or Cheletropis of Forbes. 



1. Sinusigera vitrea, A. Adams. 



S. testa vitrea, seraipellucida, perparva; spira elata, conica; anfracti- 

 bus quiiique, ultimo striis undulatis longitudinalibus ornato, ad 

 peripheriani carina valida cincto et carina spirali antice instructo ; 

 labio arcuate, in mucrone simplici desinente ; l.ibro postice valde 

 sinuato, marglne incrassato, lobo rotundato in medio producto, 

 lobo postice spina angulata armato. 



Hab. in Mare Sinense. 



Shell vitreous, semi-pellucid j s])ire conical, longer than the 

 aperture ; whorls five, the last marked with longitudinal, undu- 

 lating strise, and encircled with a prominent filiform keel at the 

 peripherv, and with another spiral ridge at the fore part ; inner 

 lip curved inwards and regularly arcuate, ending anteriorly in a 

 simple point ; outer lip deeply sinuated, the thickened margin 

 posteriorly forming a rounded lobe, the upper or hind part of 

 which is produced into a shoH angular process. 



