Dr. Albert Gunther on Ceratophrys, ttc. 417 



(Map 32), p. 137; 1870. Month. Microsc. Jouru. vol. iv. p. 185, 

 pi. 01. fig. 12. 



Upper Silurian : Biiilth and Liidford. 



2. Entoviidella huprestis (Salter). 



Leperditia huprcstis, S<alter, 1806. Rep. Brit. Assoc, p. 28.5, 

 Leperditia ? punctafissuna, Salter, Siluria, 1807, Appendix, p. 519. 

 Entmnis hiipredis, Joues, 1872. Quart. Journ. (leol. Soc. vol. xxviii. 

 p. 183, pi. 5. fig. 15. 



Menevian : St. David's, Wales. 



On accoimt of their extremely developed nuchal furrow, En- 

 tomis and Entoinidella stand apart from the other known 

 Ostracoda, recent and fossil, and may be groiiped in a famil}" 

 as EntomididyE. 



In an undescribed bivalved Entomostracon [Sulcuna, gen. 

 nov., with two species, from the Carboniferous Limestone of 

 Cork, Ireland) the^ nuchal sulcus, passing very obliquely 

 downwards and forwards, is so well defined as to cut ofi' the 

 antero-dorsal region of each valve, and raises it into a hump 

 or a sharp process, pointing upwards and backwards. This 

 genus, however, cannot be allied to Etitomis ; for it presents 

 evidence of the Cypridinal notch on the anterior margin, and 

 is far more closely related to Cypridella. 



XLVII. — Contribution to our Knowledge of Ceratophrys and 

 Megalophrys. By Dr. Albert Gunther, F.R.S. 



Ceratoplirys Fryi. 



No bony doi-sal shield. Skin densely covered with small 

 tubercles unequal in size ; the two dorsal lines of tubercles, 

 which are so cons])icuous in C. Boiei^ are absent on the anterior 

 and middle portions of the back, but represented by two short 

 series commencing in the sacral region and converging into a 

 point above the vent. Supraciliary horn long and pointed. 

 The upperside of the head deeply concave, bordered on caclj 

 side by a blunt-edged ridge terminating on the occiput, and in 

 front by a rougli prominent crest running from tlie eye to the 

 nostril. Tympanum not visible. The vomerine teeth stand 

 on a rather long transverse ridge slightly interrupted in the 

 middle, between the choanse. Tongue much smaller than in 

 C. Botei, not covering the bottom of the buccal cavit}'. Digits 

 rather long, with the tubercles on tiie lower side muchdevelo])ed; 

 carpus Avitli thiec ovafe flattish tul)Prcles, the middle of which 

 is a little larger than the outer. Metatarsal tubercle long, as 



Ann. & Mag. N. Hist. Ser.4. Volxi. 27 



