Vbnus spurca. Ven. testd ovatd, crasšd, sordide fulvd fusco ra- 

 diatim maculosd, concentrici suhohsolete costellatd, costetlis ohtu- 

 sis,prope latera subiiiterruptis ; margine ventrali intus denticulato: 

 long. M, lat. 0-6, alt. 09 poli. 

 Hab. ad Valparaiso. 



Found in coarse sand at a depth of from thirty to fifty fathoms. 

 —G. B. S. 



Genus Cytherea. 



Cytheeea radiata. Cyth. testu subtrigond, subaąuilaterd, gibbosd, 

 pallescente bmnneo radiatd et undulatim pictd, leevi, epidermide 

 corneu crassiusculd plūs minusve indutd ; lateribus antico postico- 

 que ventrem versus rotundatis ; margine ventrali rectiusculo, intus 

 IcEvi : long. 2'5, lat. \o, alt. 2- poli. 

 Hab. ad oras Columbise Occideutalis, (Salango and Xipixapi.) — 

 G. B. S. 



This species belongs to that division of the genus which has four 

 Cardinal teeth, and is destitute of the cordiform anterior impression. 

 Found in sandy mud at a depth of nine fathoms. — G. B. S. 



Cytherea unicolor. Cyth. testd ovato-subcordiformi, crassius- 

 culd, brunnescente, Icevi, politd ; lateribus antico posticoąue con- 

 centrice sulcatis, suleis medio obsoletis ; latere postico longiore, 

 versus partem veritralem subacuminato ; margine ventrali l<evi, 

 intiis purpurascente : long. 1*6, lat. 0"75, alt. VZ poli. 



Hab. ad Real Liejos Americse Centralis. 



Variat testd majore, albicante. 



Found in coarse sand at a depth of six fathoms. — G. B. S. 



Cytherea concinna. Cyth. testd ovato-subcordatd, crassiusculd, 

 rubente albicante radiatd; latere postico longiore, subacuminato; 

 costellis numerosis, concentricis, obtusis, concinnis, confertis : 

 long. 1-6, lat. 0-8, alt. 1-2 poli. 



Hab. ad Panamam. 



Found at a depth of ten fathoms in fine sand. — G. B. S. 



Cytherea 8qualida. Cyth. testd ovato-subcordatd, crassiusculd, 

 ItBvi, palUdefuscd, nonnunguam maculis irregularibus saturatiori- 

 bus ; epidermide fuscd ; latere postico longiore, prope partem ven- 

 tralem subacuminato : long. 2'7, lat. 13, alt. 2' poli. 

 Hab. ad Sanctam Elenam. 



This shell bears some resemblance to Cyth. maculosa. It has ge- 

 nerally a very dull and dirty aspect. One of the several varieties in 

 Mr. Cuming's collection is rather agreeably ornamented with con- 

 centric purple bands. 



Found in sandy mud at a depth of sLx fathoms. — G. B. S. 



A paper was read by Mr. Owen, entitled, " Description of a Micro- 

 scopic Entozoon infesting the Museles of the Human Body." The 

 author observes, that upvvards of fiftecn difFerent kinds of internal 

 parasites are alrcady known to infest the human body, but none have 

 been found of so minute a size, or existing in such astonishing num- 



