5lC Mr. SowERBY on the Spiral Tubes in the Terehrattila. 



there appears a nearly triangular appendage to the cartilage, 

 which, if not possessed of the outer shell, might indicate a trian- 

 gular foramen. I presume to lay this sketch before the Linnean 

 Society, hoping that the subject will meet with attention and in- 

 vestigation when opportunity offers. The construction of the 

 shells in my former communication would, without the present 

 specimen, have given an idea of the straight hinge being peculiar 

 to those Terehratulce with a spiral cartilage, as agreeing with 

 Parkinson and Martyn, and might therefore have been mislead- 

 ing. The spiral remains in the present species seem rare, as most 

 of the shells are filled with a hard marley earth. It was found 

 with some other species in Sladacre's Quarry, on the right-hand 

 side of llie road leading from Wych to Calwell-Green, a part of 

 the Malvern hills. .Some specimens had small round joints of 



Encrini on them* 



Tab. XXVIII. 



Fi". 3. Tercbratula obtiisa. The remains of the spiral cartilage and 

 the somewhat triangular appendage ; the shell having 

 been worn off. 

 Fisr. 4. The marie cast nearly covered with the shell and two small 

 round joints of an Encrinus, perhaps the new species 

 mentioned by Mr. Horner* as found also at the Mal- 

 vern hills. 

 I add also a drawing of a small Terebratula, which might be 

 called T. simiata, with a straight hinge. It seems plentiful in a 

 marley stratum somewhere. I do not think it is noticed in any 

 work ; and I shall be glad to learn its locality. 

 Fiff- 5. T. sinuata, natural size. 



fl. Upper side. b. Under side. 

 Fig. 6. T. sinuata, magnified upper side. 



* Trans, of Geological Society, vol. 2, 



XX X[. On 



