Miscellaneous. 205 



The distal portion of the fibula is free from the tibia ; and its shaft 

 becomes very slender ; but it is possible that a more perfect speci- 

 men would display it as continuous. Its distal extremity articulates 

 with the ascending tuberosity of the calcaneum. The cuboid facet 

 of the latter is narrow. The cuboid and navicular are distinct from 

 each other and the cuneiforms ; the mesocuueiform is shorter than 

 the ectocuneiform, and is co-ossified tvith it. 



There are probably four metatarsals. The median pair are dis- 

 tinct, but appressed ; their section, tog-other, subcircular ; the lateral 

 metatarsals are slender ; the external one is wanting, but its facet 

 on the ciiboid is very small. 



Those characters are in general similar to those of the genus 

 DicJiobune ; but Cuvier* does not state whether the cuneiforms are 

 co-ossified in that genus or not. They are united va. Atiojjlotlierium. 

 Miodoinas differs from Dichohune in the presence of but one 

 internal tubercle of the superior molars, and in the single external 

 tubercle of the superior premolars. Both genera are referable to a 

 family to be distinguished from the Anoplotheriidic by the presence 

 of external digits. This has been already named l)y Gill the Dicho- 

 bunidse. The genus LopJdochcerus is not yet fully characterized ; but 

 its inferior true molars are very elongate and have their cusps con- 

 nected by oblique ridges. — Amer. Xat., Jan. 1882. 



On the Genus Cladocora, Ehrenhenj. 

 By Dr. A. von Heidee. 



The author finds the structure of the polypes of Cladocora to agree 

 exactly with that of the Actinise, and only the basal half of the 

 polype modified by the acquisition of the solid calcareous skeleton. 



The exclusively mesodermal formation of the skeleton, already 

 established for the larva3 of Corals, is confirmed in Cladocora ; and 

 the author describes a cell-layer originating from the mesodermal 

 lamella, and situated between it and the calcareous matter, the 

 elements of which he names clialicollasts. Within the chalicoblasts 

 are produced the calcareous particles which unite to form the well- 

 known acicular systems shown by sections of the coral skeleton. By 

 the chalicoblasts calcareous material is graduallj- secreted at the 

 external surface of the polype ; and by this means the growth of the 

 polypary, in the direction of its longitudinal axis, is eflected, Avhile 

 the body of the polype itself is implicated in this only in so far as 

 that it is ill toto pushed upwards.— ^nreir/er d. hais. Akad. Wiss. in 

 Wien, December 15, 1881, p. 272. 



The Characters of the Tceniodontia , By E. D. Cope. 



Additional material gives the following results with regard to the 

 affinities of this suborder. There are three allied groups, represented 



• * Ossemens fossiles/ v. p. 183. Gaudry, Enchainemen Is du Regne 

 Animal,' p. 147. 



Ann. & Mag. N. Hist. Ser. 5. Vol. x. 15 



