161 



costd imbricatd unicd, parte anticd lyratd, radiatim costia acut^ 

 imbricatis ornatd : valvd dextrd productd sublinguiformi, den- 

 tibus aeutis recurvis serratd : nucleo lamince terminalis valvce 

 sinistra triangulari, striatd, subcomplanatd. 

 Found in soft stone, at half-tide. Island of Leyte ; Cuming. 



Triomphalia pulcherrima, pi. V. f. 2, 2 a, b, c, d. Tr. testd 



subovali ventricosd, anticd globosd, corrvgatd, anticd subatte- 



nuatd; valvis transverse dimidiatis, parte posticd costis distan- 



tibus concentrice lyratd, parte anticd lineis lyratd, margine den- 



tibus aeutis crispatis serratd : nucleo lamince terminalis valvce 



sinistrce subtriangulari, rotunda, lineis elevatis lyrato. 



This species is much larger than Tr. globosa, the ventral covering 



much more rough and inflated, the concentric ribs on the posterior 



part of the valves more strongly defined, and not crossed by the oblique 



row of raised points which is seen in the former species. 



Found in soft stone at low water at West Colombia ; Cuming. 



Triomphalia Cumingii, PI. V. f. 3, 3 a. Tr. testd rotundd, 

 crassd ; valvis postice canali divisis, concentric^ lineis elevatis 

 lyratis, antice costis minutis serratis radiatis ; parte posticd 

 concentric^ laminatd ; valvd dextrd posticd in lingulam triangu- 

 larem margine triplicatam productd ; valvd sinistrd posticd bre- 

 vissimd margine terminali circidari. 

 This shell would be completely spherical but for the hnguiform ex- 

 tension of the right valve. The left valve terminates in a circular mar- 

 gin, where the rounded part of the right valve meets it. 



Found in coral rock at low water. Isle of Zebu, PhiUppines ; Cu- 

 ming. 



The following new species of Pholas will be figured and described 

 in the forthcoming number of my 'Thesaurus Conchy liorum ': — 



1. Pholas laqueata, Thes. Conch. PI. CIII. f. 19, 20. 



2. Ph. Manilla. Thes. Conch. PI. CIII. f. 17, 18. 



3. Ph. fragilis, Thes. Conch. PL CVIII. f. 92, 93. 



4. Pii. constricta, Thes. Conch. PI. CIV. f. 27, 28. 



5. Ph. terediniformis. Ph. testd globosd, apertd, in medio 

 divisd ; antice margine ventrali subangulatd, costis laqueatis 

 concentricis ornatd ; posticd brevi, Icevigatd ; lamind dorsali und 

 subquadratd super marginem rejlexam testce positd. 



Although short, and with an angular opening, like the species of 

 the genus Xylophaga, this species and the following have the curved 

 subcardinal processes which are characteristic of the true Pholades, 

 and are not found in Xylophagce. 



Found in cakes of floating wax on the coast of Cuba. 



6. Ph. aperta, Thes. Conch. PI. CVIII. f. 99, 100. 



7. Ph. Inch, Thes. Conch. PL CV. f. 45, 46. 



This difl'ers from the great Califomian species in the characters of 

 No. CC. — Proceedings of the Zoological Society. 



