new Species o/" Pleurotomidas. 323 



The ribs are slightly oblique and the slope or oblique tabu- 

 lation occupies about one third of the upper whorls. 



Pleurotoma [ClatJmrella) lucida. 



Testa oblonga, leviter turrita, semipellucida, nitens, pallide cornea ; 

 anfract. 7 ? (apice abrupto) rehqui 5 subplani, costis crassis 8 

 (in anfr. ultimo basi dontinuis) instruct!, et liris spiraHbus supra 

 costas nodulosis (in anfr. penult. 4, in ultimo 10) ornati ; apertura 

 angusta, lougit, totius \ paulo minor ; labrum costa ultima valde 

 incrassatum, paululum infra suturam parum sinuatum ; canalis 

 latiusculus, ad basim truncatus. 



Long. 5 mill., diam. fere 2. 



Hah, Bombay. 



The space between the sixth and seventh liration on the 

 last whorl, reckoning from the suture, is rather broader than 

 the other interstices and produces the appearance of a distinct 

 sulcus, similar to that obtaining in P. cavernosa^ Reeve. 



Pleurotoma ( Clathurella) Adamsii. 



Testa breviter fusiformis, turrita, sordide albicla ; anfractus 5-6, 

 primi duo lajves, convexi, sequenies duo medio leviter angulati, et 

 tenuiter crebriter costati, cseteri medio acute angulati et carinati, 

 costis circiter 12 (in anfr. ultimo versus basim evanidis) instruct!, 

 et liris spiralibus tribus (suprema circa angulum sita) cincti, 

 ubique spiraliter minute granoso-striati ; anfr. ultimus liris circi- 

 ter 15 supra costas leviter nodulosis ornatus ; apertura angusta, 

 longitudinis totius g paulo superans ; labrum costa ultima incras- 

 satum, superne leviter sinuatum ; caualis paululum elongatus, 

 ang-ustus. 



Long, 3| mill., diam. 1|. 



Hah. Jamaica. 



This species is remarkable for its short fusiform shape, the 

 very angular whorls, and the most beautiful dense and minute 

 granose spiral strise. About six of the basal lirations on the 

 body-whorl are simple, as the ribs disappear before reaching 

 that part of the whorl. In several respects this form agrees 

 very well with P. jamaicensis^ but the dilFerence of form, the 

 different character of the sculpture of the third whorl, and the 

 number of lirations are sufficient distinctions to separate the 

 two species. I impose the above name on this lovely shell as 

 a tribute to the memory of the late learned author of the 

 * Contributions to Conchology,' especially of Jamaica. 



Pleurotoma [Clathurella) Horneana, 



Testa subovata, sordide alba ; anfract. 6, primi 2 convexi, laeves, 

 caeteri planiusculi, sutura profunda obliqua sejuncti, et costis 



