198 



valves are closed, is flat, wlth angular crenated edges. It was 

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



Nugula polita. Nuc. testd oblongd, antice rostratd, albd, epi- 

 dermide virescente, polita ; margine dorsali anticd Icnri ; striis 

 nonnullis obliąuis anticis : long. 1 'I-, alt. 0*6, tat. 45 poli. 



Hab. ad Panamam. 



A single specimen of this very beautiful species was dredged up 

 insand froma depth of seven fathoms. — G. B. S. 



NucuLA PisuM. Nuc. testd parva, obliąiie ovali, latere antico 

 brevissimo, margine dorsali inclinntd : long.0'25, lat.0'15, alt. 

 0-2 polL 



Hab. ad Valparalso. 



Dredged in coarse sand and gravel, at various dcpths from sevea 

 to forty fathoms. — G. B. S. 



Nugula costellata. Nuc. testd oblongd, tenui, anties ros- 

 tratd, acuminatd, costis duabus dorsalibus approzitnatis, crenu- 

 latis ; costellis acutis concentricis, totam superjiciem tegentibus : 

 long. 0-8, alt. 0'3, lat. 0-2 poli. 



Hab. ad Panamam. 



T\vo specimens were taken in sandy mud at a depth of ten fa- 

 thoms. A thin epidermis covers the shell. — G. B. S. 



Nugula gibbosa. Nuc. testd oblotiga, gibbosd, antice acuminato- 

 rostratd, longitudinaliter sulcatd ; dorso antico depresso, margi- 

 nibus centralibus elevatis : long. \'2, lat. 0"55, alt. 0-6 poli. 

 Hab. ad littora Peruviae. 



Found in soft mud, at a deptli offive fathoms, at Tumbez in Peru. 

 A variety, with a less elevated ridge in the centre of the anterior 

 dorsal margin, and of much smaller size, vvas found in mud, at 

 tvvelve fathoms, in the Gulf of Nocoiyo. — G. B. S. 



Nugula Elenensis. Nuc. testd ovatd, gibbosd, longitudinaliter 

 sulcatd, antice rostrato-acuminatd ; limbo dorsali antico arcuato, 

 viarginibus crenulatis : long. 0*5, lat. 0-25, alt. 0*35 poli. 



Hab. ad Sanctam Elenam. 



Dredged in sandy mud at a depth of six fathoms. — G. B. S. 



Nugula eburnea. Nuc. testd ovatd, gibbosd, longitudinaliter 

 sulcatd, nitidd, eburned, antice rostrato-acuminatd: long.0'65, 

 lat. 0-3, alt. 0-35 poli. 

 Hab. ad oras Columbiae Occidentah's. 



Found in sandy mud, at a depth of from seven to nine fathoms, 

 in the Bay of Caraccas. — G. B. S. 



Nugula guneata. Nuc. testd ovato.cuneiformi, gibbosd, epider- 

 mide "Hirescente , nitidd, latere postico rotundato, antico acuminato; 

 superficie concentrice sulcatd : long. O'i, lat. 02, alt. 0*25 poli. 



Ilab. ad Valparaiso. 



Dredged in coarse sand and gravel, at various depths, from four- 

 teen to forty-five fathoms. — G. B. S. 



Nugula £xioeA. Nuc. testd parvd, obliųue ovatd, albicante, pel- 



