Prof. Owen on the Anaiumy of .Myrinccophaga jiibata, 59 

 The synonymy of the two species will then be as follows : — 



N. UMBiLiCATUS. Testci suhorbiculcv'is, ventricosa, striis confertis 

 vohentibus insculpta, utrinque late umbilicatu ; ))iar(/inibus 

 umhilicorum vix rotundatis ; umbilico pervio, infunclibuliformi, 

 nigra, maryine externa vix ratundato ; rufescens, postice radiatim 

 ferrugineo strigata, strigis angustis, confertis. 



N. umbilicatus, Lister, Conch, t. .552. f. 4. 



N. SCROBICULATUS. Testa suborhicularis, subdepresso, Icevis, ni- 

 tida, lateribus radiatim fluctuatis, utrinquelate unibilicata, um- 

 bilico crateriformi, margine externa rotundato, late flavescens, 

 postice radiatim ferrugineo strigata, strigis latis, remotis. 



N. scrobiculatus, Soland. MS. Portland Catal. 169. no. 3653 ; 

 Dillwyn, Catal. i. 339. 



N. Pominlius, var. /3., Gmelin, no. 3369. 



N. crassus umbilicatus, Chemn. Couch, x. t. 137. f. 1274, 1275. 



Le grand Nautile ombiliquc, Favanne, Conch, i. 726. t. 7. f. B 3, 

 t. 69. f. D 2. 



N. umbilicatus, Knorr, Vergn. iv. pi. 22. f. 4 ; Lamarck, Auim. 

 s. Vert. xi. 322 ; Blainville, Malac. pi. 8. f. 2 ; Crouch, Conch. jjI. 20. 

 f. 16; Sowerby, Thes. Conch, pi. 98. f. 7. 



February 10, 1857.— J. Gould, Esq., F.R.S., Y.P., in the Chair. 



On the Anatomy of the Great Anteater (Myrmecophaga 

 JUBATA, Linn.). Part IL By Professor Owen, F.R.S., 

 F.Z.S., etc.* 



In my former communication on the Anatomy of the Great Ant- 

 eater, the position of the stomach and its relations to adjoining vis- 

 cera were briefly pointed out. In the present paper I propose to de- 

 scribe the form and structure of this very remarkable organ in the 

 Myrmecophaga jubatUc 



Moderately distended the stomach presents a subglobular form, of 

 about 8 inches diameter, with a smaller subglobular appendage, as 

 it seems, of about 3 inches diameter, intervening between the main 

 cavity and the intestine. 



The oesophagus terminates near the middle of the upper surface 

 of the main portion, of which about 4 inches extends to the left of 

 the cardiac orifice to form what Ilaller called the ' saccus ceecus.' 



On the middle of both the anterior and posterior surfaces of the 

 stomach is a sheet of tendon, of an irregular triangular form, 6 inches 

 in longest diameter, which is in the direction of the length of the 

 stomach, and in which the tendon extends from the large to the 

 small division of the organ, and acquires upon the latter its greatest 

 thickness and whitest colour. 



* This paper will be reprinted in the Transactions, and there ilhistrated with 

 4 to plates. 



