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 line. 



698. SCISSURELLA RIMXILOIDES, n. Sp. 



S. t. rapide augente, albida, tenuissima; apice celato ; anfr. 



iii., radiathn liratis, liris subdistantibus, acutis, obliquis ; um~ 



bih'eo magno ; labro denlivi, hand fisso, sed apertura postica, 



ut in"^vmA&" formata, xub(iuttdrata, elongata ; liris trans- 



versis gradus testa increscentis definientibus ; peritremate con- 



tinuo, obliquo. 



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



nrst known from America. It looks like a Velutina crossed by 



sharp ribs in the direction of the slanting mouth. In the first whorl 



rjie ribs are very close. It then assumes its normal sculpture, but 



there 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, which is long and somewhat 



. "Ctangular ; but there is no band between the hole and the outer 



iip. The shell furnishes a complete transition to Rimula. It is 



preserved on tablet 2532. 



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



Hab. Mazatlan ; off Spondylus calci/er ; Liverpool Collection. 



699. VlTRINELLA ORNATA, n. Sp. 



V. t. subdiscoidea, diaphana, tenuissima ; anfr. iv., quorum iii. 

 primi nucleosi, insculpti; ultimo carina maxima circa periphe- 

 riam ; postice subangulata, rugis radiantibus et strioks spi- 

 ralibus ornata ; antice earinata, carina nodosa; basi carina 

 altera et rugis radiantibus ornata; umbilico angulato, satis 

 magno; labro a carina indentato. 



Long. -01,5, lat. •028--035 ; div. (circ.) 175°. 



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

 Liverpool Collection. 



700. VlTRlNELLA TENUISCTJLPTA, n. Sp. 



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

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

 quasi carina prope suturam sculpta; peripheria haud angu- 

 lato ; basi bis angulafa, interdum rugis radiantibus distantibus 

 ornata; umbilico satis mag?io, carinato ; apertura undata,sub- 

 quadrata. 

 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. -016, long. spir. 0, lat. •023--03 ; div. 180°. 

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

 Liverpool Collection. 



258 



