241 



Teredo, subgenus Calobates. Pallettes stilt-shaped, bony. Type, 

 T. thoracites Gd. Page 222. 



Xylophaga cardissa. T. rotundato-ovata, desuper visa cuneato- 

 cordiformis ; rictu ventrali rhombeo ; angulo ventrali obtuso ; angulo 

 intrante etiam obtuso, apicibus rotundatis ; extremitate postica acute" 

 rotundata ; extrern. antica curtfi, satis lata ; umbonibus tiunidis, glo- 

 bosis ; marginibus dorsalibus recurvis, umbilicum amplum efformanti- 

 bus ; sulco mediano utroque concentrice plicato ; portione postica 

 simplici ; portione antica concinne et confertim denticulate ; apophysi 

 gracili demum dilatato et arcuato. Long. 1 ; alt. 7 ; lat. 8 millim. 



From the Mergui Archipelago. Rev. Mr. Benjamin. 



The basal angles are much as in X. terediniformis ; but it differs 

 from this and from X. aperta in the acutely ovate posterior form, the 

 rounding of the angle apices, and the very delicate prominent 

 sculpture. 



Genus Julia. T. equivalvis, valde insequilateralis ; umbonibus 

 eminentibus, compressis, incurvatis ; areola cordiformi valde impressa : 

 cardo utraque valva sistens dente unico subcochleari, dextro post sinis- 

 trum aptante, et rima transversa antice limitato ; sinistro ab umbone 

 fissura sejuncto : ligamentum marginale : cicatrix unica, subcen- 

 tralis, tripartita. , 



This curious genus bears no resemblance to any one yet described, 

 unless it be to Reniella Swains., which has been pronounced to be the 

 early stage of Vulsella. It is very difficult to assign it a place ; but it 

 must at present be associated with Vulsella and Pedum, though exter- 

 nally it has the texture, polish and ornamentation of the Veneridse. 

 The delicate fissures issuing at the hinge indicate the possession of a 

 byssus. Further observations must solve our doubts. 



Julia exquisita. T. parva, ovata, antice insigniter rostrata, 

 ossea, polita, concentrice undulata, smaragdina ubique fusco radiatim 

 punctata et interdum albo articulata; margine postero-dorsali late arcu- 

 ato; m. ventrali instricta : intus margaritacea, radiatim exilissime 

 striata; margine everso, tenuissime crenulato. Long. 5; lat. 4; alt. 4 

 millim. 



Inhabits Sandwich Islands. Rev. Mr. Johnson. 



A beautiful little shell, colored like Smaragdinella from the same 

 islands. The sudden and profound depression in front of the beaks is 

 quite striking, and thus produces a very pointed somewhat upturned 

 anterior end. A single valve looks much like some of the Bullidas, 

 Chelidonura, for instance. 



31 



