Notices of Memoirs — The Bohemian Chalk Formation. 467 



labelled C. Murchisoni. In 1860 Mr. Salter thought that C. elliptica 

 was only a badly-preserved variety of C. inornata (A. M.N. H. I.e.), 

 but in tiae Catal. Cambr, Sil. Foss. p. 178, he recognized it as " quite 

 distinct." 



The above-mentioned three specimens supply the only evidence 

 of an eye-spot in these British Ceratiocaridoid Phyllopods.^ It is 

 not only a generic character distinguishing them from Ceratiocaris, 

 but an important family distinction, of which, for the present, we do 

 not propose to estimate the value. 



22. Physocaris vesica, Salter. 



i860. Ceratiocaris (Physocaris) vesica, Salter. Ann. Mag. N. H. ser. 3, vol. v. 



p. 159, woodcut fig. 

 1865. Ceratiocaris ( Physocaris ) vesica, Salter and H. Woodward. Catal. Chart. 



Foss. Crust, p. 17, fig. 8. 

 1S67. Ceratiocaj-is vesica, Salter. In Siluria, 3rd (4th) edit. p. 517. 



1877. Ceratiocaris (Physocaris ) vesica, H. Woodward. Cat. Brit. Foss. C. p. 72. 



1878. Ceratiocaris vesica, Huxley and Etheridge. Cat. C. S. Foss. p. 142. 



Of this curious fossil Phyllopod, described carefully by Mr. Salter 

 in 1860, only one specimen is known — namely, Ludlow Museum U. 

 It differs slightly from Mr. Salter's figure, being larger, and showing 

 an appearance of having been probably broken away to a little 

 extent just above the front, so as to leave a notch and angle, which 

 constitute the prominence in the woodcut figure. If continued over 

 this notch, the outline of the shell would possibly be that of a broad 

 oval ; whereas now it is broadly and obliquely pyriform (25 X 

 20mm.). The relative position of the animal is supposed to be 

 indicated by the telson occupying the upper part of the abdominal 

 appendages attached to the fossil. There are 8-9 segments in the 

 abdomen, which appears to come out from the lower and hinder 

 quarter of the carapace, and is very slender near its origin, but 

 higher at its ultimate segment (5 mm. long) ; altogether 30 mm. 

 The telson itself is 11 mm. long. One lateral spine (stylet), 7 mm., 

 is present. The whole animal is about two inches long. 



It was collected by the late Mr. Salwey in the Lower Ludlow at 

 Leintwardine, and Mr. Salter at first registered it as Ceratiocaris 

 inflata. 



n^OTioiES OIF DvniEiMioiies. 



Studies in the District of the Bohemian Chalk Formation. 



The Weissenberg and Malnitz Schists. By Dr. Anton 



Fkitsch, Prague. 

 Studien im Gebiete der Bohmischen Kreideformation. Die 



Weissenberger und Malnitzer Sghichten. Mit 155 Holz- 



schnitten. Die Iserschichten. Mit 132 Textfiguren. Von Dr. 



Anton Fric. (Archiv der naturw. Landesdurchforschung voa 



Bohmen, IV. Band, No. 1., V. Band, No. 2.) 



IN these two memoirs Dr. Fritsch gives, in considerable detail, a 

 petrographical and pala^ontological description of three of the 



1 The " ocular tubercles," mentioned in the footnote at p. 236, Siluria, 3rd (4th) 

 edit. 1867, are doubtless really due to the presence of "teeth" -within the valves. 



