162 



the dorsal side of the anterior part, which is finely striated in both 

 directions ; in the epidermidal laminse, which are beautifully serrated ; 

 and in the integumental covering of the dorsal edge, which is divided 

 into four parts. 



Collected by Capt. Ince, R.N., in coral rocks at Rain Island, Torres 

 Straits. 



8. Ph. multistriata, Thes. Conch. PI. CIV. f. 35, 36. 



9. Ph. LATissiMA. Ph. testa subquadratd,subcompressd,apertd, 

 antic^ angulatd postice truncatd ; costis moniliferis radiatis et 

 lineis concentricis cancellatd ; umbonibus subcentralibus mar- 

 gine dorsali refiexo. 



A wide, rather flat shell, widely gaping in front, and truncated at 

 the posterior extremity, with radiating ribs forming knots on the raised 

 lines of growth. It appears to be without accessoiy valves. 



Taken in Manilla Bay ; Cuming. 



10. Ph. SPATHIILATA. Ph. testa elongatd, clausd, oblique divisd ; 

 parte untied radiatim costatd subangulatd ; parte posticd con- 

 centric^ leviter striata, subtruncatd, ad margines integumente 

 protectd, ad terminus in cyatho-corneo, loteribus spathuliformi- 

 bus, productd : ad umbones laminis duabus cequalibus postice 

 bilobatis, antice elongatis. 



From New Zealand. 



Pholas Calva (Sowerby, Proc. Zool. Soc. 1834), PI. V. f. 4. 



I wish to call the attention of the Meeting to a remarkable speci- 

 men of Ph. calva in situ, which may be considered as bearing, in 

 some degree, upon the boring question in a manner somewhat un- 

 favourable to the ' rasping ' theory. In this specimen the animal 

 has lined the anterior narrow end of its hole with a thick laminated 

 tube, formed not of shelly matter, as in the case of Pholas tubi/er, of 

 which I figure a specimen in situ, but of the same material as the 

 stone in which it has burrowed, and bearing every appearance of a 

 reformation of its substance by precipitation, after having been dis- 

 solved by a chemical agent. The structure is far too fine to have 

 been formed from any debris which could be the result of merely me- 

 chanical action. 



The specimen of Ph. tubi/er, PI. V. fig. 5, in my father's collec- 

 tion, shows in a remarkable manner the fitting of the hole to the shape 

 of the shell, which is not symmetrical, and could not turn in the 

 shghtest degree. 



