132 Reviews — Bather's Crinoidea of Gotland. 



simplest forms of the group, and are characterized by having all the 

 brachials free, and no interradial plates enter the dorsal cup unless 

 in the posterior interradius. About 40 species of this group have 

 been found in Gotland : 18 of these were described by Angelin, 

 G by other authors, and 16 are quite new. They are included in 

 10 genera, only one of which, Gothocrinus, is new, and they belong 

 to 7 families, all previously recognized. The following is the list: — 



Family Pisocrinidse. Fisocrinus pilula, de Kon., P. oUula,Ang., P. pocillum, Ang. 



,, Heterocrinidse. Serpetocrinus Fletcheri, Salter, H. convolutus, Hall, 

 JE. Ammonis, n. sp., H . Jlabellicirrus, n. sp. 



,, Calceocrinidse. Calceooinus gotlandicus, Aug., C.cix. gotlandicus, G. pugil, 

 n. sp., C. tucanus, n. sp., G. tenax, n. sp., G. cfr. tenax, 

 G. nitidus, n. sp., G. inlerpres, n. sp., G. pinnulatus, n. sp. 



,, Dendrocrinidse. Homocrinns tenuis, n. sp. 



,, EuspirocrinidiB. Fuspirocrinus spiralis, Ang. 



,, Decadocriaidse. Gothocrinus gracilis, n.g. et sp., Bolryocrintis ramosis- 

 simus, Ang., B. cucurbitaceus, Ang., sp. 



,, incert. Streptocrimis crotalurus, Ang., sp. 



,, Cyathocrinidse. Cyaihocrinus visbycensis, n.sp., G. acinotubus, Ang., G. strio- 

 latiis, Ang., G. Diana, n. sp., G. glaber, Ang., G. muticus, 

 Ang., G. distensus, Ang., G. loigimaniis, Ang., G. ramo- 

 SHS, Ang., Gissocrinus typus, n, sp., G. elegans, Ang., 

 G. campanula, n. sp., G. umbilicatus, Ang., G. macro- 

 dactylus, Ang., G. goniodactylus, Phill., sp. et var., 

 G. squamifer, MS., G. incurvatus, Ang., sp., G. verru- 

 cosus, n. sp., G., sp. 



About 12 of these species occur in the Gotland beds "c" and "d," 

 which are considered the equivalents of the Wenlock shale and 

 Limestone in this country, whilst 32 species have been met with 

 in the Crinoid and Coral conglomerate, bed "f", which is correlated 

 with our Aymestry Limestone or Lower Ludlow. But two of the 

 above species are fairly common both in Gotland and England, 

 viz. Fisocrinus pilula and Herpetocrinus Fletcheri ; the only other 

 species occurring in the two regions are FTerpetocrinus Ammonis, 

 Calceocrinus nitidus, Cyathocrinus acinotubus, Gissocrinus gonio- 

 dactylus, et var., and G. squamifer, so that, as the author remarks, 

 the Crinoids afford but little assistance in correlating the strata in 

 the two countries. 



Although Mr. Bather adopts Wachsmuth and Springer's classi- 

 fication for the order Inadunata, he now substitutes, in place of 

 their suborders, " Larviformia " and " Fistulata," the new divisions 

 of the " Monocyclica " and " Dicyclica," the former possessing only 

 one circlet of interradially situated basals, the latter having an 

 additional circlet of infrabasals, radially situated between the basals 

 and the stem. The Monocyclica will include all the genera placed 

 in the Larviformia, with the possible exception of Oapressocrinus 

 and the Gasterocomidas, and the further additions of the Hybo- 

 crinidee, Calceocrinidge, Catillocrinidee and perhaps Belemnocrinus. 

 The Dicyclica, again, will comprise the three families of the 

 Dendrocrinidee, Uecadocrinidas and Cyathocrinidae, and the pro- 

 visional families Carabocrinidge and Euspirocrinidee. In this 

 division there is a mox'e regular pentamerous symmetry in the 

 cup-plates than in the Monocyclica, and it is only in the right 



