26 MCTREX. 



cancellata subtrigona, varicibus laminiformibus supenie an- 

 gulatim productis, ultimo ad aperturam lacineato late expanso ; 

 spira acuminata, anfractibus angulatis ; apertura majuscula, 

 subtrigona, canali brevi. — Tbe general surface is cancellated, 

 and the last varix is broadly fringed all round the aperture 

 and down to the end of the canal. 



115. Angasi, f. 189, 190, Crosse. — Testa tenuis, subtri- 

 gono-fusiformis, pallide fulva aut subrosea, interdum bifas- 

 ciata, laevis, inter varices obscure quadrituberculata ; varici- 

 bus laminatim fimbriatis, superne angulatim elevatis, sub- 

 hamatis, margine dentato ; spira producta, acuminata ; 

 anfractibus angulatis, supra angulum plano-depressis. — It is 

 strange that this little shell should have been described as a 

 Typhis, not having the tube which projects from the angle 

 between the varices in that genus. 



116. cancellatus, f. 34, 82, Sowerby. — Testa subtrigona 

 alba solida spiraliter lirata, trivaricosa, inter varices nodoso- 

 cancellatis, varicibus crassis costellatis, fronde superiori 

 fistuloso, apertura parva, margine crenulato, canali lato 

 brevi clause — The varices are more thickened and flattened 

 in the specimen f. 32 than in 82, and the latter was formerly 

 described by myself in the Proceedings of the Zoological 

 Society as M. canaliferus. But the difference is only one 

 of development, such as obtains in most of the species. 



117. mitryEFOrmis, f. 32, Moiverby. — Testa M.uncinario 

 similis, sed tenuis, gracilis, alis uncinatis magis elevation 

 arcuatis ; anfractibus infra versus suturam contractis. — Mr. 

 Reeve puts this and the preceding species together. It is a 

 question of degree, figures 32 and 33 seem extremely different, 

 and those who possess specimens of the former may prefer 

 applying the distinctive name to it. The more intermediate 

 specimens still keep much nearer to M. uncinarius. 



118. uncinarius, f. 33, Lamarck. — Testa subtrigona lata 

 solida Mva leevigata, inter varices inconspicue unituber- 

 culata, trivaricosa, varicibus crassiusculis superne ad angulum 

 anfractuum productis uncinatis, infra brevissime digitatis. — 

 Only the authority of Deshayes would have led me to agree with 

 Reeve that Lamarck was describing this shell when he referred 

 (however doubtfully) to Martini's figure of M. clavus. 



119. festivus, f . 96, Hinds. — Testa subfusiformis, utrinque 

 acuminata, fulva, minutissime granulata, spiraliter inciso- 



