Dr. Albert Giintlier on Ceratophrys, &c. 417 



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

 pi. 61. fig. 12. 



Upper Silurian : Builtli and Ludford. 



2. Entomidella buprestis (Salter). 



Leperditin buprestis, Salter, 1806. Rep. Brit. Assoc, p. 285. 

 Lcpcrditid ? punctatissima, Salter, Siluria, 1867, Appendix, p. 519. 

 I'Jidoinis bitprestis, Jones, 1872. Quart. Journ. Geol. Soc. vol. xxviii. 

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



Menevian : St. David's, Wales. 



On account of their extremely developed nuchal furrow, En- 

 tomis and Entomidella stand apart from the other known 

 Ostracoda, recent and fossil, and may be grouped in a family 

 as Entomidid^. 



In an undescribed bivalved Entomostracon {Sulcuna^ gen. 

 no v., 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 oft" 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 Entomis ; 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 Gijnther, F.Il.S. 



Ceratophrys Fryi. 



No bony dorsal shield. Skin densely covered with small 

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

 which are so conspicuous in C. Boieij 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 tlie head deeply concave, bordered on each 

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

 front by a rough prominent crest running from the eye to the 

 nostril. Tympanum not visible. The vomerine teeth stand 

 on a rather long transverse ridge slightly interrupted in the 

 middle, between the choanee. Tongue much smaller than in 

 C. Boiei, not covering the bottom of the buccal cavity. Digits 

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

 carpus with three ovate flattish tubercles, the middle of which 

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



Ann. & Mag. N. Hist. Scr.4. IV. xi. 27 



