30 



flies, diseases carried by them, methods of destruction, etc., was 

 in course of preparation, and would be placed on sale at the price 

 of twopence per copy at an early elate. 



Miss E. A. Fraser, B.Sc, F.Z.S., presented a paper on the 

 Lead-cavities and development of the eye-muscles in Trichosiorus 

 vulpecula, with notes on some other Marsupials. The usual eye- 

 muscles, including a well-developed m. retractor bulbi, are 

 present in the Marsupialia. A large premandibular head-cavity, 

 representing the first somite of the head, is found in all the 

 Dipvotodontia, and appears to be either absent or of very small 

 size in the Polyprotoclontia. The walls of the cavity proliferate 

 and give rise to the mm. recti superior, inferior, and internus and 

 the m. obliquus inferior. The second and third somites of the 

 head are solid. In the eailiest stages they are united together 

 and are rather difficult to distinguish from the surrounding 

 mesenchyme, the second being at the same time connected 

 ventrally with the maxillo-mandibular mesenchyme. The m. 

 obliquus superior develops as an upgrowth from the second 

 somite. The anterior portion of the third somite becomes the 

 m. rectus externus, whilst the posterior portion gives rise to the 

 m. retractor bulbi. 



Dr. R. Broom, M.D., O.M.Z.S., gave an account of the 

 following two papers : — 



(1) On the Organ of Jacobson and its Relations in the "Insec- 

 tivora." — Part. II. Tcdpa, Centetes, and Chrysochloris. 



In Part I. it was shown that Tupaia and Macroscelides and 

 their allies must be separated from the typical Insectivores, such 

 as Erinaceus and Gymnura, to form a very distinct and not 

 nearly related order — the Menotyphla. In Part II. it is shown 

 that Chrysochloris has no near relationship with either the 

 Insectivora or the Menotyphla, and must be made the type of a 

 distinct order, the Chrysochloridea. Centetes, which has hitherto 

 been regarded as allied to Chrysochloris, is more nearly related to 

 Erinaceus, though it differs from it in many points and may later 

 have to be separated from it. Tcdpa shows many affinities with 

 Erinaceus and a number of differences, the value of which is at 

 present not apparent. 



(2) On the Anomodont Genera, Pristerodon and Tropidostoma. 

 Pristerodon, described by Huxley in 1868, is a very near ally 



of Dicynodon, differing mainly in having a series of molars which 

 are smooth in front and have a series of denticulations behind. 

 The males are tusked, the females without tusks. Oudenodon 

 raniceps of Owen is a species of Pristerodon ; while Opisthocteno- 

 don agilis Broom and probably also Opisthoctenodon br achy ops 

 Broom are other species of Pristerodon. 



In 1889 Seeley described two occiputs under the names Dicyno- 



