Reviews — G. H. Girt// — Guadalupian Fauna. 563 



separated from the SphaerosiplioniidiB and the Sphserocoeliidse by the 

 fact, among others, that the cysts are not separated into rings or 

 segments, and from the Guadalupiidoe by not being composed of 

 ' separate- walled ' tubes and the waut(?) of an outer fibrous layer. 

 The Polysiphonidse also includes one species and comes nearest to the 

 Cystothalamiidae. It differs from this latter in the possession of 

 a solid instead of a perforated outer wall, in the absence of ostia, 

 and "in having a definite and peculiar arrangement of the internal 

 tubular structures, the tubes in Cijstothalamia being more numerous, 

 imperfect, chiefly radial in direction, and without any definite order 

 of arrangement ". 



Among the Coelenterata Cladopora, Hall, is recorded, apparently for 

 the first time, from the Carboniferous. Several new forms of 

 Linddroemia are described. In a discussion of the first new species 

 of this genus Girty treats of its relationship with Lophophyllum. 

 Carruthers has more recently given a revised diagnosis of the latter 

 and has shown that the type L. konincki is a young form of 

 ^ Cyathaxonia' tortiiosa^ Mich., a form which cannot be a true 

 Cijathaxonia on account of the presence of a well-marked dissepi- 

 mental zone in mature growth-stages. 



A new Cystid — Ccenocystis, n.gen. — has certain affinities with the 

 Blastoidea, but is placed with the Cystoidea "because of the absence 

 of large, regular, ambulacral areas and the presence of a large eccentric 

 anal pore ". 



The section on the Brachiopoda is of more than usual interest. 

 A new classification is submitted for the Orthotetinae of the Stropho- 

 menidse. Streptorhynclms and SchuchertcUn have neither septa nor 

 dental lamellae in the ventral valve. The former genus includes non- 

 plicated forms which mostly have a high, distorted, ventral valve, 

 " sometimes, possibly generally, attached bj' cementation." The dorsal 

 valve is without an area and has a large cardinal process and well- 

 developed socket plates. This genus would correspond to AYaagen's 

 ' Simplices'. Plicated forms which agree with the foregoing genus in 

 otlier respects are so far without a generic designation. Schuchertella 

 includes those shells which have a low, regular, ventral valve, 

 peduncular attachment, a narrow distinct dorsal area, and a cardinal 

 process, usually small. Plicated species are unknown. Derhya, 

 Orthotetes, and Geyerella would be placed by Waagen in the ' Septati ' 

 and ' Camerati ' divisions of his Derbya. Girty restricts the application 

 of Derbya to non-plicated shells which possess a well-developed median 

 septum in the ventral valve and have "the dental lamellae more or 

 less completely atrophied and discrete from the septum except at the 

 apex" (= 'Septati' Waagen). AVaagen's type of Derhya {Derbya 

 regularis) belonged to this section. Plicated forms, of which only one 

 species is known, have not yet been separated from the preceding. 

 Orthotetes and Geyerella are included in the ' Camerati ' division. 

 The ventral valve possesses moderately developed dental plates which 

 converge and unite and, with the pseudodeltidium, enclose a triangular 

 pyramidal chamber. At their junction with one another the dental 

 lamellae also unite with the median septum, forming a trii'adiate 

 figure. Orthotetes is restricted to the non-plicated forms, Geyerella 



