210 Messrs. T. and A. Scott on some 



Ilumenis with cctepicondyliir and entepicon- 

 dyliir forameu ; ribs with uuciuate pro- 

 cesses ; all the vertcbrje with intercentral 

 hvpapophyses 4. IIattkiiud.e. 



Humerus with ontepicondylar foramen ; ribs 

 without uncinate processi'S ; uo hvpapo- 

 physes between the dorsal vertebne o. IIomokisauuio.i:. 



b. Nasal opening single. Mandible with- 

 out coronoid process, the rami united 

 in a solid symphysis ; vertebne feebly 

 biconcave ; uo hypapophysej betweeu 

 the dorsal vertebrae. Humerus with 

 ectepicoudylar foramen or groove ... . 6. Rhyxcuos^urid.b. 



B. Jaws toothless. Vertebriu procoelous. 

 Mandible without coronoid process, the 

 rami united in a solid symphysis. Hu- 

 merus with ectepicoudylar foramen .... 7. Sauraxodontid.?5. 



References. 



(1) Bauk, G. — " On the Morphology of the Skull in the Mosasauridae," 



Journ. of Morphol. vii., 1892, pp. 1-22, pis. i. and ii. 



(2) BouLF.NGER, G. A. — " Notcs on the Osteology of Heloderma horri- 



duni and //. smpectum, with Remarks on tbe Systematic Position 

 of the Helodermatidie," Proc. Zool. Soc. 1891, pp. 109-118. 



(3) BoULF.NGER, G. A. — " On British Remains of Homccosuurus, w\\\\ 



Remarks on the Classitication of the Rhyuchocephalia," t. c. 

 pp. 167-172. 



(4) DoLLO, L. — " Xouvelle Note sur le Champsosaure," Bull. Soc. G»5ol. 



Belg. v., 1892, pp. 5-53, pis. vi.-viii. 



(5) Gorjanovic-Kramberger, C. — " Aigialosaurus, eine neue Eidechse 



aus den Kreideschiefern der Insel Lesina, mit Riicksicht auf die 

 bereits beschriebenen Lacertiden von Comen und Lesina,"' Glasnik 

 Soc. Hist.-Nat. Croat, vii., 1892, pp. 74:-10G, pis. iii. and iv. 



(6) LoRTET, L. — " Les Reptiles fossiles du Bassin du Rhone/' Arch. 



Mus. Hist. Nat. Lyon, v., 1892, 139 pp., IG pis. 



XXXI. — On some new or rare Scottish Entomostraca. By 

 Thomas Scott, F.L.S., Naturalist to the Fisliery Board 

 for Scotland, and Andrew Scott. 



[Plates VII. & VIII.] 



Parartotrogus, gen. no v. (provisional name). 



Anterior and posterior antennse and mouth-organs as in 

 Artotrogus, Boeck, except that the siphon is rudimentary. 

 First pair of swimming-feet witli botli brandies two-jointed; 



