346 Dr. M. ReTues — On Psalidocrinus strainbergensis. 



part of that opening and to have united by their edges to the upper 

 border formed by the pre- and ])Ost-frontals and frontal. Comparison 

 with the very simihir series of bones in the orbit of the specimen of 

 ? Ricnodon (Fig. 5) shows that these bones are not really in the eye 

 at all, but are dei'mal ossifications in the eyelid corresponding roughly 

 to the palpebral bones of crocodiles. 



Micropholis Stoivi comes from the Procolophon beds, the age of 

 which, although not accurately known, is undoubtedly either Lower 

 or Middle Trias. It is hence of much interest as the latest 

 rachitomous Stegocephalian, of which much is known (isolated 

 vertebrae were described many years ago by v. Meyer from the 

 Lettenkohle of Wurttemburg). It is an exceedingly advanced type, 

 as is shown by the following features : — 



1. The unique arrangement of the; bones of the top of the skull. 



2. The enormous interpterygoid vacuities. I showed recently that 

 the really primitive Amphibia {Pteroplax, etc.) have very small 

 interpterygoid vacuities, and tha*. enlargement of them is one of 

 the chief lines along which the characteristic Amphibian as opposed 

 to reptilian evolution takes place They are larger in Micropholis 

 than in any other rachitomo'v ■'i.te, but, as in all members of that 

 order, the pterygoids are ai xCiilated with the basisphenoid and not 

 suturally united with the paraspheii ^id as in all Stereospondylus types, 



3. The slender clavicles and -2;reat reduction of the cleithra, 

 a parallel specialization to that common to the Ileptilia. 



4. The very slender humerus. 



5. The loss of the grooves for lateral line sense organs. 



Despite its many advanced characters, Micropholis is a comparatively 

 unspecialized animal, free from the many bizarre features of such 

 types as Trematops, Cacops, and Dissorophus. Its ancestors are 

 unknown, and no types really closely allied to it have been found, 

 so that it will have to form a separate and distinct family. 



III. — Psalidocrinus : a new gencs of Crinoidea. from the 

 TiTHONiAN of Steam berg. 



By Dr. Mauric Eemes, Olomouc, Moravia, .md Dr. F. A. Bather, F.E.S., 

 British Museum (Nat; Hist.). 



Papers referred to. 

 1891. Jaekel, 0. " Ueber Holopocriniden, etc." : Zeitschr. Deutsch. geol. 



Gesell., vol. xliii, pp. 557-670, pis. xxiv-xliii. 

 1907. Jaekel, O. " Ueber die Korperform der Holopocriniten " : N. Jahrb. 



f. Mineral., Festband, pp. 272-309. 

 1912. Eemes, M. "Nove zpr4vy o lilijicichz moravsk^hotithonu" : Zvldstnl 



otisk z casopisu moravskeho musea zemskeho. Brno 1912. Eocnik xii, 



els. 1, pp. 157-169, pis. i-iii. 



PAET I. By Dr. M. EemES. 



THE species Kugeniacrinites stramhergensis was described by me in 

 1912 (pp. 161, 167, pi. iii, tig. 2) on the evidence of a single 

 specimen (A). Examination of a better specimen (B), subsequently 

 acquired, and believed to be of the same species, has convinced me 

 that, though the species appears to belong to the family Eugenia- 

 crinidae, Zittel, still it belongs to none of the known genera. This 



