222 PROCEEDINGS OF THE CALIFORNIA 



bus ; costis circ. xiii. acutissimis, expansis, vix refiexis, postice attingentibus, 

 lineis margini spirae dextro parallelis spiram, ascendentibus, t. adolesc. postice 

 vix coronatis, adulta simplicibus ; apertura subcirculari, urubilico nullo ; sculp- 

 tura spirali nulla. 



Long. 0-45, long. spir. 0-29, lat. 0'22, div. 38°. 



Hab. Monterey ; Cooper. 



Like S. communis, jun., but with the upper whorls slightly coronated. 



Scalaria crebricostata, Cpr. n. s. State Collection, 393. 



S. t. gracili, tenui, alba ; anfr. x. rotundatis, baud attingentibus ; costis circ. 

 xv., acutis, refiexis, vix attingentibus, lineis irregulariter spiralibus ascendenti- 

 bus ; costis juxta suturam eleganter coronatis ; sculptura spirali, nisi striulis 

 interdum exillimis, nulla ; apertura rotundata ; umbilico nullo ; operculo nor- 

 mali, dense corneo. 



Long. 0-70 ; long. spir. 0-52, lat. 0L8, div.. 26° 



Hab. Monterey, San Pedro, Cooper, common. 



= " Scalaria, unique " Mus. Cum. No. 32. 



Somewhat resembles S. tenuis, Sby., but is not so turrited. 



Genus Opalia, H. & A. Adams. 

 Opalia spongiosa, Cpr. n. s. 



O. t. turrits, parva, albida, margiuibus spirie rectis ; anfr. ix. subplanatis, 

 suturis impressia ; costis undulantibus circ. xiii., plerumque (nisi ad suturas 

 crenulatas) obsoletis ; tota superficie lineis punctorum creberrimis, spiralibus, 

 punctis creberrimis, minutis, altissimis ; circa basim imperforatam costa antica 

 latissima, spirali ; apertura ovata, valde callosa ; operculo aurantiaco, pauci- 

 spirali. 



Long. 0-36, long. spir. 0-26, lat. 0-12, div. 20°. 



Hab. Monterey, Cooper. From shell washings. 



The solitary specimeu has the general aspect of O. granulosa on a very small 

 scale. 



Opalia retiporosa, Cpr. n. s. State Collection, No. 1014. 



O. t. "O. bullatce" forma simulante, sed sculptura omnino diversa ; anfr.nucl. ?... 

 (decollatis) ; norm. vii. subrotundatis, suturis impressis ; costis radiantibus rotun- 

 datis, subarcuatis, baud varicosis, circ. xiv., super suturas tenue continuis ; anfr. 

 ult. seriebus nodulorum spiralibus irregularibus, vice costarum, instructs, periph- 

 eria tuberculosa ; tota superficie retiporosa, interstitiis alte interpunctatis, 

 punctulis minutissimis, confertissimis ; basi vix costata, a serie nodulorum ang- 

 ulata ; apertura rotundata ; peritremati continuo, varicoso ; labro haud sinu- 

 ato ; operculo ? paucispirali. 



Long. 0-28, long. spir. 0-20 ; lat. 0-10 ; div. 20°. 



Hab. Catalina Island ; 3 dead in 40 fm. ;" Cooper. 



The texture has a rotten appearance ; yet one of the specimens was stained 

 with purple, and contained the dried remains of the animal, with its operculum. 

 In the endeavor to extract this, the shell gave way. 



