271 DR. p. V. CARPENTER ON NEW SPECIES 



rounded ribs, which are evanescent near the umbo. Inside with a 

 very few strong teeth, developed in a curved Une. 



608. SCISSTJRELLA RIMULOIDES, H. Sp. 



S. t. rapide augente, alhida, tenuissima ; apice ceJato ; anfr. 



iii., radiatim liratis, liris subdistantibus, acvtis, obliquis ; um- 



bilico magno ; labro dficlivi, hand Jisso, sed apertura postica, 



ut in" Kimu\a" /pt-mata, ^iiibqnadruta, elongata; liris trans- 



versis gradus testcE increscentis definientibus , peritremate con.' 



tinuo, obliquo. 



Only one specimen was found of this beautiful little species, the 



first known from America. It looks like a Velutina crossed bv 



"sliarp ribs in the direction of the slanting mouth. In the first whorl 



t»ie ribs are very close. It then assumes its normal sculpture, but 



♦.here is nearly a whorl before there is any trace of incision. This 



appears to have begun as a slit, which was afterwards closed up. A 



band, marked off by ten transverse ribs showing stages of growth, 



encircles the shell as far as the hole, vvhich is long mid somewhat 



. -octangular ; but there is no band between the hole and the outer 



lip. The shell furnishes a complete transition to Rimula. It ia 



pieserved on tablet 2532. 



Long. -023, long. spir. -003, lat. '03; div. 140'=. 



[lab. Mazatlan ; off Spondt/his calci/er ; Liverpool Collection. 



'JOO. VlTRINELLA ORNATA, 11. Sp. 



V. t. snbdiscoidea, diaphcma, tenuissima ; anfr. \v., quorum iii. 

 primi nucleosi, inscidpti ; ultimo carina maxima circa per^phe- 

 riam ; postice ftubangulata, rugis radiantibus et striohs spi- 

 ralibus ornata ; antice carinata, carina nodosa; basi carina 

 altera et rugis radiantibus ornata; umbilico angulato, satis 

 niagno ; labro a carina indentato. 



Long. -01.5, lat. •028--U3.O ; div. (circ.) 1/.^°. 



Hub. Mazatlan; one specimen off Spondylus, on tablet 2533; 

 Liverpool Collection. 



700- VlTRINELLA TENUISCULPTA, H. Sp. 



V. t. planata, diaphana, tenuissima ; anf. iii. et dimidio, quorum 

 iii. nucleosi; striis elevatis, spiralibus, quarnm una magna, 

 quasi carina prope suturam sculpta ; peripheria haud angu- 

 luta ; basi bis angulata,interdum rugis radiantibus distnntibus 

 ornata; umbilico satis magno, carinato ; apertura undata, sub- 

 quadrat a. 

 The sculpture is not uniform over the last whorl. The principal 

 diagnostic features are the biangulated base, the infrasutural keel, 

 and the rounded periphery. 



Long. -OKi, long. spir.'O, lat. •023--03 ; div. 180°. 

 Hab. Mazatlan; one specimen off Spondylus, on tablet 2534 1 

 Liverpool Collection. 



258 



