14 Dr. J. C. Melvill on Marine Mollusca 



apud suturas impressis, ventricosulis, perlaevibus, uudique longi- 

 tudinaliter paucicostatis, costis crassis, nitidis, apud ultimum 

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

 basin truncatulo, sinu nullo, columella recta, canali brevi. 

 Long. 5*50, lat. 2 mm. 



Hob. Mekran Coast, off Gliarbar, at 40 fathoms, 1900. 



A thickened pale brown or straw-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-fusiformi, nifcida, delicata, pallide 

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

 omnibus delicate cancellatis, caeteris ad medium angulatis, longi- 

 tudinaliter sex-costatis, costis remotis, regularibus, aequidistanti- 

 bus, superficie omni spiraliter arete liratula, ultimo anfractu 

 bicarinato, carinis chordalibus ; apertura angusta, oblonga, labro 

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



Long. 8, lat. 2-50 mm. 



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



A remarkably graceful shell, conspicuous for its strong 

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

 on the lower, while a rectangular appearance is obtained by 

 the six longitudinal remote yet regular ribs on each whorl, 

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

 sculpture of some Mangiliai ; 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 and uniform. Sinus 

 broad, but shallow. Mouth narrowly oblong, canal slightly 

 prolonged. 



An alliance with other handsome forms from the same 

 region, e. g. M. tow?isendi, JSowb., galigensis and o'maleyi, 

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

 resemblance — indeed, at first I considered them identical ; 

 but the quadrate sculpture is peculiar to M. telartemoris, 

 which derives its specific name from this distinctive attribute. 



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



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

 quorum duo apicales bulbosi, lseves, caeteris ad suturas multum 



* purls, a wrinkle. 



