ACADEMY OF NATURAL SCIENCES. 219 



The description is written from a single perfect specimen in Mr. Howell's col- 

 lection, and some fragments from the shell-washings of Dr. Cooper's. 



Genus Styliferina, A. Adams. 

 • • Styliferina turrita, Cpr. n. s. 



St. t. minima, albida, solidiore, lasvi, turrita ; anfr. nucl. iii. subnaticoideis, 

 apice mamillato ; norm. v. planatis, angustis, suturis parum impressis ; basi 

 subito rotundata, baud umbilicata ; apertura subrotundata ; labro postice 

 parum contracto. 



Long. 006, long. spir. 0-04, lat. 0-02, div. 20°. 

 Hab. S. Pedro. Cooper. 



A single specimen of this tiny shell was found in the shell-washings of Dr. 

 Palmer's consignment. The mouth is unfortunately choked up with a grain of 

 coarse sand which I have not been able to extract. 



Genus ?Jeffreysia, Alder. 

 ? Jeffreysia translucent, Cpr. n. s. 



? J. t. " Barleeiaz subtenui " simili, sed teuuiore, tumidiore ; cornea, pallide 

 fulva, lasvi, nitente, satis diaphana ; anfr. nucl. normalibus, apice submamillato ; 

 norm. iv. subconvexis, suturis distinctis ; basi rotundata, baud umbilicata ; 

 apertura ovata, peritremati vix continuo ; labro acuto ; labio appresso, regione 

 umbilicari parum calioso. 



Long. 0-08, long. spir. 0-045, lat. 0-06, div. 55°. 



Hab. S. Diego ; in shell-washings. Cooper. 



Only one specimen having been seen, without animal or even operculum, the 

 genus is doubtful. In its slight labial deposit it resembles " Litiopa " dubiosa, 

 C. B. Adams. 



Genus Cythna, A. Adams. 



Cytltna albida, Cpr. n. s. 



C. t. miuuta, albida, laevi, diaphana, lata ; anfr. nucl. normalibus, vertice 

 mamillato ; norm. iii. tumidis, rotundatis, rapide augentibus, suturis valde im- 

 pressis ; basi rotundata, valde umbilicata ; umbilico subangulato ; apertura 

 subrotundata ; peritremati continuo, acuto, t. adulta nonnunquam a. pariete 

 separato. 



Long. 0-03, long. spir. 0-015, lat. 0-025, div. 80°. 



Hab. S. Pedro ; in shell-wash iugs. Cooper. 



Known from C. tumens, Maz. Cat. No. 421, by the non-keeling of the um- 

 bilicus. 



Genus Chrysallida, Cpr. 



Chrysallida pumila, Cpr. n. s. 

 Chr. t. minuta, angusta, alba ; vert. nucl. subito immerso, dimidium trunca- 

 tions tegente ; marginibus spirse parum excurvatis ; anfr. norm. iv. planatis, 

 suturis vix distinctis ; clathris radiantibus rectis, validis, planatis, circ. xx., 

 marginibus spirae utroque latere parallelis, sajpius attingentibus, circa basim 



