406 MESSES. MLLMLL AND STANLLX 0>~ .June 18, 



Columbella ( Semixella) selasphoea -, sp. n. (Plate XXIII. 

 fig. 7.) 



C. iiiiini.ta, ovata, plerumqut obesula, solidiuscula, cinereo-straminea. 

 flammis fulgt trinis rufo-fuscis pulchrt dispositis; a it fractibus 6-7, 

 quorum apieales tree globulosi, vitrei, cateris regulariter costis 

 lonffitudinaffints, Icevibus, recite, decoratis, ultimi anfractus ad 

 dm, interdum supra basm tvanidis, interdum, sed rarius, 

 dorsaUter undiqut ; apertura angustt oblonga, labro 



pauUum incrassato, land, intus paucidi nticuiaio; columella nitida, 

 sknpUei. 

 Long. ;j, lat. 1* mm. 

 Hah. Karachi. 



According to Mr. S. Pace, this species has hitherto been con- 

 founded with C. troglodyte* Sou\ ., from New Caledonia, or C. omata 

 Pease. It is by the former name that we have for years labelled 

 it in our collections. There are. dispersed over the tropics of both 

 hemispheres, about a dozen or more closely-allied species of Semi- 

 nellai, mostly gregarious, and collected in handfuls where they 

 occur, and which only acute systematic research can hope to 

 successfully differentiate. This species is principally conspicuous 

 for its smooth longitudinal ribs, with no revolving lines, the ribs 

 themselves being often obsolete on the last whorl, wholly or, at 

 all events, in part. The beautiful zigzag painting, like lightning- 

 flashes, is also characteristic. 



Columbella (.Semixella) iowvshidi, sp. n. (Plate XXIII. 

 fig. 8.) 



C. testa mianta, ovata vel obesula, brunnea vel castanea, re/ 

 st rami /it a, solida ; nnfractibus 6—7, quorum apieaHet li a.lbo- 

 lactei, cateris ad sutura* impressis, Kubturritie, longitudinaliter 

 crassicostatix, undiqut spiraliter liratis, I iris ad juncture* 

 eostarum gemtnulatis, nitidis, interdum ad medium anfraetue 

 njtiini abeenttbu* out partim evanidis; apertura anguste oblonga, 

 labro incrassato, intus denticulate; columella recta, simplici. hand 

 mxdtu.m incrassta. 

 Long. 3*50, lat. 1'50 mm. 

 Hab. Karachi. 



A variable and locally abundant species, at first thought to be 

 identical with C. ostreicola Sowb., or its ally C. nigricans Sowb. ; 

 both these being species of the New World. In the opinion of 

 Mr. Pace it is sufficiently distinct from both these, and from 

 ft atrata Gould, to need a cognomen and description. There appear 

 two varieties : one, the typical, uniformly thickly ribbed, chestnut 

 or brown unicolorous, crossed by revolving lirae entirely over the 

 surface ; while the other is spirally banded with darker brown, just 

 where the lirae are present, they becoming either partially or 

 entirely obsolete in the centre of the body-whorl, and in this 

 instance a central light fascia is exhibited. 



1 oeXas, lightning ; <pepw, I bear. 



