163 



costis radiantibus acutis, angustis, circiter ix. subobliąuis ; in- 

 terstitiis latis, confertissime et minutissime spiraliter striulatis; 

 apertura subelongata ; labro acuto, simplici, sinu rotundato, 

 aperto ; ad dorsum varice acuto, extante ; labro tenui, 

 Long. -32, long. spir. -16, lat. -12, div. 30°, 

 Hab. lu Sinu Panamensi ; legit T. Bridges. Sp. un. in Mus. 

 Cuming. 



Intermediate between M. rigida, Hinds, and M. striosa, C. B. 

 Adams. 



^J 13. Man GELI A ? rigida, var. fuscoligata. M. testą "M. 

 rigidse" simili; sed graciliore, costis acutioribus, lineis spi- 

 ralibus miltus expressis, fascia rufo-fusca super suturam plūs 

 minusve conspicua. 

 Long. -27, long. spir. -15, lat. -08, div. 28°. 

 Variat t. plūs minusve elevata, seu latiore. 

 Hab. In Sinu Panamensi ; legit T, Bridges. Mus. Cuming. 

 As far as can be judged from a comparison of nine specimens 

 brought by Mr. Bridges with two of M. rigida, Hinds, tbis is a 

 very variable species, differing in colour, strength of sculpture, 

 solidity, or spirai elevation. M. negieda, C. B. Ad., four specimens 

 of which were found to vary, may also prove a brown variety of the 

 šame species. 



14. Defrancia intercalaris, n. s. D. testą graciliore, pal- 

 lide castanea, fascia circa peripheriam pallidiore, spira elevata, 

 marginibus rectis ; anfr. x. rotundatis, suturis parum impressis; 

 costis radiantibus supra circiter xi. rotundatis, interstitiis 

 latis; infra aliis intercalantibus ; lirulis spiralibus, subdis- 

 tantibus, in spira plerumąue iii., ad basin crebrioribus ; rugulis 

 radiantibus minutissimis totą superfcie sub lente confertissime 

 ornata ; apertura ovali, canali brevi ; labro margine acuto, vix 

 serrato, intus denticulato, ad dorsum varice prominente, latera- 

 liter compresso ; sinu postico rotundato, aperto, sutura vix 

 attingente, callositate parietali parva. 

 Long. -64, long. spir. -35, lat. -24, div. 25°. 

 Hab. In Sinu Panamensi; legit T. Bridges. Sp. un. in Mus. 

 Cuming. 



With some of tbe characters of Drillia, and a loose resemblance 

 to Pleurotoma gracillima, this sbell seems to bave most affinity with 

 Defrancia rava, Hinds. 



15. Defrancia serrata, n. s. D. testą parva, turrita, mar- 

 ginibus spirce excurvatis ; albida, rufo-fusco fasciata ; fascia 

 aream sinus implente, dein circa basin continua ; anfr. viii. 

 convexis, costis rotundatis xii., circa basin obsoletis, et lirulis 

 spiralibus costarum apiees serrantibus, iii. in spiram monstran- 

 tibus, eleganter instructis ; apertura subąuadrata ; labro ad 

 marginėm serrato, intus tuberculis v., ad dorsum varice valde 

 prominente, ornato ; sinu rotundato, lato ; labio subrugoso. 



Long. -3, long. spir. -18, lat. -12, div. 28°. 



