228 Reviews — P. de LorioVs Echinoids of Portugal. 



S, IE AT" I E AAT" S. 



I. — Description de la ^ Faune Jurassique du Portugal. 

 Embranchement des Echinodermes. Par P. de Loriol. 

 Commission des Travaux Geologiqnes du Portugal, pp. 108- 

 179 ; pis. xix.-xxix. (Lisbonne, 1890-91.) 



THIS is the second and concluding part of M. de Loriol's 

 admirable monograph on the Jurassic Echinoderms of 

 Portugal. It first treats of the Irregular or Exocyclical Echinoids, 

 of which 16 species are described, belonging to the genera 

 Holectypus, Pygaster, Pileus, Pyrina, Ech'nohrissiis, Pygurus, and 

 CoUyrites. Several of the species occur also in the corresponding 

 Jurassic beds in this country. Of the Starfishes, only one species, 

 Aspidaster Delgadoi, de Lor., has been met with, which is the type 

 of the genus. The author considers that the well-known Oreaster 

 hulbiferus, Forbes, from the Upper Chalk of this country, sub- 

 sequently placed in an existing genus, Pentaceros, should rightly 

 be included in Aspidaster. There are 34 species of Crinoids 

 belonging to the following genera : Polichocrinus, Millericrinus, 

 Pentacrinus, Balanocriniis, Extracrinus, Antedon, and ThoUieri- 

 crinus. Some of the species are based merely on the characters 

 of portions of the stems, more particularly amongst the Penta- 

 crinoids, and in the genus Balanocrinus there are six species 

 described wholly from joints of the stem ; neither in Portugal nor 

 elsewhere has the calyx of this genus been yet brought to light. 

 In his description of Pngeniacrinus caryophyllaUts, M. de Loriol 

 points out the importance of Mr. Bather's observations on the 

 presence of basals in a certain stage of the development of this 

 form, which have evidently in the course of its growth been, 

 absorbed into the first radials ; at the same time he thinks it correct 

 to define the genus Eugeniacrinus as without basals, since in the 

 mature stage of the animal, on which the generic characters are 

 based, they are no longer present. In the family of the Eugeniacrinidse, 

 however, some genera, as Trigonocrinus, Bather, and Polichocrinus, 

 de Lor., have basals preserved in the calyx ; but the author follows 

 the late Dr. H. Carpenter in excluding from it Eudesicrinus, de Lor., 

 which comes properly into the family Holopidge. In another very 

 peculiar form, Dolichocrimis aberrans, de Lor., likewise placed in the 

 family Eugeniacrinidse, basals were clearly present, and the first 

 radials, five in number, are extremely long, and form by their union 

 a cylindrical tube deeply furrowed in its interior. 



In the first part of this monograph 95 species of Endocyclical 

 Echinoids were described, thus bringing a total of 146 species of 

 Echinoderms in the Jurassic strata of Portugal, of which 69 are 

 new forms. This number is relatively small when compared with 

 those known from the corresponding strata in France. The 

 Lusitanian stage of M. Choffat, which comprises the higher 

 horizons of the Jurassic strata in Portugal, is most prolific in 

 Echinoderms. A notable feature is the enormous predominance of 



