TRANSACTIONS OF THE SECTIONS. 119 



ties had been included under this head. The genu3 TentacriUtcs is truly referable 

 to the Pteropoda, and therefore all the forms which belonj^ here must necessarily 

 ba free and unattached to foreiga objects, since an attached or parasitic Pteropod 

 is not conceivable. Similarly all the forms of TentacuUtei proper must possess a 

 straight shell, since the shell of the Pteropods is always either straight or regularly 

 curved. No irregularly twisted and contorted tubes can, therefore, be properly 

 referred to Teiitaculites. 



In accordance with these principles, the author formerly established the genus 

 ConchicoUtes, to include Tubicolar Annelides the tubes of which are attached 

 socially in clustered masses to dead shells (American Journ. of Science and Arts, 

 vol. iii. No. 15, 1872). The author now proposed a second geaus, under the name 

 of Ortonia, after its discoverer, Mr. Edward Orton, of Ohio, to include certain other 

 Tubicolar Annelides which had been previously referred to TeiitacidUes. The genus 

 Ortonia comprises the single species O. coiiica, vrhich is doubtfully identitied with 

 the Tentaculites Jlexuosa of Hall. The only known species is from the Lower 

 Silurian (Caradoc) of North America, occurring in the rocks of the " Cincinnati 

 Group " (Hudson-River series) of Ohio. The following diagnosis gives the 

 characters of the genus .and species : — ■ 



Ortonia, Nich. Animal solitary, inhabiting a calcareous tube, which is 

 attached along the whole of one side to some foreign body. Tube slightly liexuous, 

 conical, in section cylindrical or subtriangular. Walls of the tube thick, cellular 

 along the margin opposite to the attached siuface, and markedly annulated by 

 transverse ridges or i-ings along the sides. 



Ortonia conica, Nich. Tubes growing attached to the shell of some nioUusk ; 

 varying in length from \ to | an inch, with a diameter of about ^ of an inch at 

 the mouth. Lateral annulations of the tube varj-ing in number from 30 to 35 in 

 the space of an inch. Surface smooth and completely destitute, so far as observed, 

 of longitudinal stri?e. 



o 



Notes on Maehairodus latidens found hy the Rev. J. MacEncrv in Kent's 

 Cavern, Torquaij. B>j ^Y. Pengelly, F.B.S., F.G.S. 



In this communicati\On the author discussed the following questions: — 

 1st. Did Mr. MacEnery find more than five canines of 31achairodus latidem in the 

 Cavern ? 

 2nd. Did he find there more than one incisor of this species ? 

 3rd. To what era did the Kent's Hole Maehairodus belorg? 



1. Having pointed out that in his " Cavern Researches " MacEnery mentioned no 

 more than five canines, all of which had been traced, and explained that it had been 

 inferred from certiiin expressions in documents preserved by the Yorkshire Philoso- 

 phical Society that a sixth canine, found in the Cavern, had been presented by 

 MacEner}- to the Museum in the Jardin des Plantes, Paris, the author stated that he 

 of Maehairodus, whence it has been inferred that two incisors were found by 

 had recently visited the Museum for the purpose of investigating the question, and 

 had found that plaster casts of a canine, and not an .actual tooth, had formed part of 

 MacEnery's present to Cuvier. 



2. Proceeding to the .second question, he called attention to a plate, in Indian 

 ink, the property formerly of Mr. MacEnerj', but now of the Torquay Natural- 

 History Society. It contains five figures, three of them representing two incisors 

 MacEnery. In reply, it was pointed out that MacEnery mentions but one incisor, 

 tliat there was no evidence that the figures represented Kent's Cavern specimens, 

 that the plate certainly did not belong to the Cavern series, aaid was never referred 

 to in MacEnery's manuscripts. 



3. On the third and most important question (the era of the Cavern 3Iachairo- 

 dus) it was shown, from MacEnery's statements, that the canines and incisor 

 were f<)und in a branch of Kent's Hole kno^vn as the Wolf's Cave, mixed with re- 

 mains of the ordinary cave mammals (Rhinoceros, Elephant, Horse, Ox, Elk, Deer, 

 Hyaena, Bear, Wolf, and Fox) — that though of delicate .structure, they, unlike some 

 of the specimens found with them, bore no indications of contusion or abrasion — and 



