Prof. Owen on the Anatomy of ^lyrmecophaga jubata. 59 



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



N. UMBiLiCATUS. Testa suborhicularis, ventricosa, striis confertis 

 volvefitibus insculptay ufrinque late umbilicata ; marginibus 

 umbilicorum vix rotimdatis ; umbilico pervio, infundibuliformi, 

 nigra, margine externa vix ratundata; rufescens, postice radiatim 

 ferruginea strigata, strigis angustisy canfertis. 



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



N. SCROBICULATUS. Testu suborbiculuris, subdepressa, Icevis, ni- 

 tida, lateribus radiatim Jluctuatis, utrinque late umbilicata, urn- 

 bilico craterifarmi, margine externa ratundata, late Jlavescens, 

 postice radiatim ferruginea strigata, strigis latis, rematis. 



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

 Dillwyn, Catal. i. 339. 



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



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



Le grand Nautile ambilique, Favanne, Conch, i. 726. t. 7. f. B3, 

 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, pi. 20. 

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



February 10, 1857.— J. Gould, Esq., F.R.S., V.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 etomach 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 

 Myi^mecaphaga jubata« 



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 Haller called the * saccus caecus.* 



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 illustrated with 

 4 to plates. 



