lANTHINA. 51 



Globoae 



6. GLOBOSA, f. 16, 18, Sivainson. — Testa globosa, tenuis, 

 inflata, tenuissime decussata, supra infraque purpurea, medio 

 pallida ; spira parva, anfractibus rotundatis subimmersis, 

 prope suturam tumidis, ultimo magao, inflate; apertura 

 elongata, infra acuminata, sinu marginali acuta. — Thin, 

 inflated, of a pale colour on the upper part of the whorls, the 

 upper of which are rounded and partly sunk in the suture. 

 The aperture is longer than wide, and pointed below. There 

 is no tangible distincticn between this and the 7. decollata 

 of Carpenter. I. iricolor is more suffused and iridescent in 

 colour, and somewhat less inflated. 



7. PALLIDA, f. 19, 20, Harvey.— TestsL quam /. globosa 

 minor, magis exigua, apertura antice rotunda. — Smaller and 

 proportionately narrower than /. globosa, but only separated 

 here on account of the rounded and patulate form of the 

 lower part of the mouth. I. striolata of Adams and Rve. 

 is indistinguishable, although the faint striae common to all 

 tlie species are a little more expressed. 



8. imcoLOE, f. 17, Reeve. — Testa quam I. globosa tenuior, 

 purpvu-eo suffusa, subiridescens, anfractu ultimo infra magis 

 excavato, columella magis tortua. — The suffused colour, the 

 slight iridescence, thin substance, excavation of the lower 

 part of the body whorl, and the tortuous columella seem to 

 justify the separation of this species from 7. globosa. 



9. EXIGUA, f. 23, 24, Lamarck. — Testa parva utrinque 

 acuminata, omnino densi purpurea, tenuiter lirata liris medio 

 angulatim sinuatis ; apertura alta medio profunde et acute 

 sinuato. — 7. bifida, Nuttall, is probably the American repre- 

 sentative of this species, which is longitudinally ridged, the 

 ridges being sharply sinuated in the middle. It is narrower 

 than the other globose forms, and more pointed at both 

 ends. 



10. NiTENS, f. 21, Menke. — Testa quam 7. exigua paulo 

 magis inflata, vix lirata, nitens, utrinque acuminato. — The 

 form is the same as that of 7. exigua, perliaps a little more 

 inflated, but the lirre are partially, if not entirely, obsolete. 



