78 Rci'ieics — Proj. Gemmellaro — Crmtacea in FamUna-Limestone. 



plate — especially the slower-coiling, if any one will measure the 

 figures with compasses. 



" G. Saemanni [but apparently inclndhig as var. /3 anotlier soUd-Tteeled 

 species]." This is a most curious criticism in face of the explana- 

 tion of the plate, and the fact that these forms are expressly included 

 in the hollow-carinate section of the Grammocerata. I wrote to 

 Prof. Blake asking him if he had mistaken the carina on tiie core 

 (pi. 34, fig. 2) for the true carina. His reply rather astonished 

 me — it showed that he did not understand the structure of a hollow- 

 carina. He " thought it was the presence of a keel in the shell, 

 but not on the cast," which made a hollow carina. This is 

 certainly not the case: it is the presence of a partition-band over- 

 lying the abdominal part of the cast containing the siphuncle. The 

 partition-band connects the inner walls of the overlying elevated 

 carina, and so there is formed a hollow triangular tube around the 

 periphery of the Ammonite. The abdominal part of the core may 

 be carinate or rounded — this does not affect the structure of the 

 hollow-carina in the least. I fully explained the structure of the 

 hollow-carina in my Monograph, page 81, footnote, and illustrated 

 its various phases in pi. A. In fig. 47 of that plate I figured a 

 carinate core bearing a hollow-carina, and this feature is to be very 

 frequently noted in the genera Witchellia, and Sonninia, as well as 

 in Grammoceras. 



A desire not to occupy too much space alone prevents me from 

 replying to all Prof. Blake's criticisms ; but from the above remarks 

 1 leave it to be judged whether the critic in an attempt to correct 

 the author has not himself fallen into errors. 



DB:E3A7'IEAA7"S. 



I. — Contributions to the Paleontology of Sicily. 



The Crustacea of the Fusulina-limestone of the Valley of the 

 Sosio EivER IN the Province of Palermo, Sicily. By Prof. 

 G. Gr. Gemmellaro. 



I Crostacei Dei Calcari con Fusulina, della Valle del Fiume 

 Sosio, nella Provincia bi Palermo in Sicilia. Memoria di 

 Gaetano Giorgio Gemmellaro, Professore di Geologia della R. 

 Universita di Palermo. Memorie delle Societa Italiana delle 

 Scienze fisiche e matematiche, Tomo viii. ser. 3, No. 1, pp. 40, 

 and 5 plates. 4to. Naples, 1890. 



THE author refers this Fusulina-limestone to the " Permo-Carboni- 

 ferous " formation, and finds in it the following fossils. — 

 I. Trilobites : Proetiis, Steininger, 2 new species ; Phillipsia, 

 Portlock, 4 new species, and of the " subgenera " Grijfithides, 

 Portlock, and PseudophiUipsia, nov., one new species each. 



If Prof. Gemmellaro is correct in his determination of these beds, 

 tben these Trilobites are younger than any hitherto discovered, and 

 later than the true Carboniferous in age. 



