208 



characters between Strotnbus and Pterocera. In detail of pattern 

 and sculpture it resembles S. laciniatus, but there is a large central 

 oblique tubercle on the back, and the tip is thickened into two very 

 large obtuse oblong tubercles, the upper part being produced into 

 two decided Pterocera claws, one of which is prolonged in a curved 

 manner to the extent of an inch and a half. The specimen has 

 rather the appearance of being malformed ; but notwithstanding this 

 seeming irregularity of growth, there is no doubt whatever of its 

 being specifically distinct from any hitherto described form. 



2. Cvpr^a Barclayi (PI. XXXVIII. fig. 4). Cypr. testa pyri- 

 formi-ovata, subumbilicata ; dorso elevatiusculo, extremitatibus 



eleganter calloso-productis, subrostratis ; basi convexa ; denti~ 

 bus utrinque octodecim ad novemdecim fortibus tumidiusculis ; 

 interstitiis conspicue sulcatis, profundis ; dentibus exterioribus 

 super labrum decurrentibus, medianis bifidis ; nitente, alba, 

 dorso aurantio-spadiceo undique eximie punctato et lentiginoso, 

 extremitatibus aurantio-spadiceo tinctis. 

 Long. 1 poll., lat. f- poll. 



Hab. Island of Diego Garcia, a dependency of Mauritius (taken 

 on a block of coral dredged up from deep water) . 



An exquisitely delicate species in the finest possible condition, 

 perfectly unlike any of this favourite genus hitherto known. It is 

 of an elegantly pyriform shape, with the extremities rather produced; 

 the teeth on each side the aperture being especially characteristic, 

 from their strong development and deeply grooved interstices. The 

 painting is a delicate profusion of orange-buff dots of different degrees 

 of tone upon a shining pearl-white ground ; the extremities and 

 teeth, the outer of which extend nearly across the base, being tinged 

 with the orange-buff in a darker and brighter hue. 



3. Pyrula(Rhizochiltjs) De Burghi^e (PI. XXXVIII. fig. 3). 

 Pyr. testa pyriformi-ovata, subanguste umbilicata ; spira bre- 

 viuscula, turrit a ; anfractibus superne late angulato-expansis, 

 ad angulum squamis subamplis plano-compressis Jlabellatim 

 coronatis, infra basin versus attenuatis, undique dense liratis, 

 liris subtilissime serratis ; alba, apertures fauce sulcata. 



Long. If poll., lat. \\ poll. 



Hab. China. 



A beautifully turbinated pagoda-like shell, being coronated through- 

 out the expanded angle of the whorls with large compressed fan- 

 shaped scales. It is of the same peculiar typical form as the Pyrula 

 Mawce, the umbilicus being, however, much more contracted, and is 

 believed to be an inhabitant of the same locality. 



I have the pleasure of naming this very delicate and remarkable 

 species in honour of Mrs. De Burgh, a lady, whose warm assiduity 

 and zeal in collecting shells is equalled by her intelligent apprehen- 

 sion of their characters and correct estimation of their comparatire 

 rarity and beauty. 



