14 Dr. J, C. Melvill on ^farine MoUusca 



aputl suturas impressis, ventricosulis, porlajvibns, uudique longi- 

 tudiiialiter paucicostatis, costis crassis, nitidis, apud ultiinum 

 novem ; apcrtura parva, ovata, labro extus crasso, nitido, ad 

 basin truucatulo, sinu nuUo, columella recta, canali brovi. 

 Long. ooO, lat. 2 mm. 



JIak Mekian Coast, off Cliarbar, at 40 fathoms, 1900. 



A thickened pale brown or sfraw-coloured Mangilia, few- 

 ribbed, the number only extending to nine on the last whorl. 

 Altogether it is seven-whorled, two of these being apical ; 

 the outer lip is thickened, no trace of sinus being perceptible; 

 columella straight, canal very short. 



Mangilia tetartemoris, sp. n. (PI. II. fig. 24.) 



M. testa pergracili, attenuato-fusiforrai, iiitida, delicata, pallide 

 straminea ; anfractibus 7, quorum tres apicales, tertio perinflato, 

 omnibus delicate cancellatis, caeteris ad medium angulatis, longi- 

 tudinaliter sex-costatis, costis remotis, regularibiis, ajquidistanti- 

 bus, superficie omni spiraliter arete liratula, ultimo anfractu 

 bicariuato, cariuis chordalibus ; apertura angusta, oblonga, labro 

 tenui, sinu lato, nequaquam profuudo, cauali paullum prolongate. 



Long. 8, lat. 2*50 mm. 



Hah, Mekran Coast, off Astola Island, at 90 fathoms. 



A remarkably graceful shell, conspicuous for its strong 

 vet thread-like angled keels, one upon the upper whorls, two 

 on the lower, while a rectangular appearance is obtained by 

 ttie six longitudinal remote yet regular ribs on each whorl, 

 these not being exactly continuous, as is the case with the 

 sculpture of some Mangilice ; the apical whorls are beauti- 

 fully cancellate, colour of the remainder pale ochreous or 

 straw-colour, slightly intensified on the ribs. The spiral 

 lines crossing the whorls are close arid uniform. Sinus 

 broad, but shallow. Mouth narrowly oblong, canal slightly 

 prolonged. 



An alliance with other handsome forms from the same 

 region, e. g. M. towiisendi, iSowb., guHgeiisis and 6'inaleyij 

 Melv., is to be noticed. To the last of these it bears closest 

 resen)blance — indeed, at first I considered them identical ; 

 but the quadrate sculpture is pccidiar to M. tetartenioris, 

 which deiives its specific name from this distinctive attribute. 



Pleurotomella rhytismt'is *, sp. n. (PI. II. fig. 25.) 



P. testa perparva, alba, breviter fusiformi, compacta ; anfractibus 6, 

 quorum duo apicales bulbosi, laeves, caeteris ad suturas multum 



* pvTLs, a wrinkle. 



