248 APPENDIX TO THE SUPPLEMENTS TO 



typical ones are always more inflated. The less truncated forms approach W. Wanldyni. 

 Some specimens are much thickened on the front margin, some are broadly truncated in 

 front, and others are almost pointed." 



Locality. — Upper Greensand or Middle Neocomian. Little Brickhill two and a half 

 miles east of Blatchley, Bedfordshire. 



At the period at which I published my Cretaceous Monograph and its Supplement, 

 the Brickhill locality and its fossils had not been discovered. It was subsequently 

 described by Mr. Keeping in the 'Geological Magazine,' decade ii, vol. ii, August, 1875, 

 and more fully by the same author in his instructive and valuable ' Sedgwick Prize 

 Essay for the year 1S79,' above referred to, and from which we extract (p. 20) the 

 following important remarks : 



" Both the Upware and Brickhill Neocomian sea-bottoms were particularly rich in 

 the ' lamp-shells.' They grew so thickly clustered together in places that, being over- 

 crowded, they interfered with each other's proper growth and produced abnormal distor- 

 tions." (Mr. Walker possesses a specimen of Ter. Meyeri in which the irritation pro- 

 duced by the working of a boring shell has caused a pearl to be formed in its interior.) 

 " Brickhill was the metropolis of the Brachiopoda in Cretaceous times ; but still, although 

 the species are so numerous (thirty-five in all), the genera are few, namely, only Terebra- 

 fula, Waldheimia, Terebratella, Kingena (1 sp.), Terebratulina (1 sp.), and Rhynchonella. 

 Amongst these the Waldheimia Woodwardi and W. pseudo-jurensis, and the species of 

 Terebratella, are the most noteworthy, as remarkable and characteristic types. Of the 

 Terebratella only two species, T. Meyeri (n. sp.) and T. Davidsoni, are common at 

 Upware; no well-marked representative of the other species having to my knowledge 

 occurred in that neighbourhood. Terebratula capillata is remarkable on account of its 

 limited and curious distribution, being only known in these Neocomians, the Red Chalk, 

 and the Tourtia of Belgium. Terebratula Upwarensis, T. microtrema, T. pralonga, T. 

 depressa, and T. Moutoniana were extremely abundant, but T. Meyeri, T. Lancasteri, 

 and T Dallasii are rare. At Brickhill the Brachiopods occurred in the richest profusion, 

 and a noble series of them may be studied in the Woodwardian Museum. The near 

 relationship of the Brickhill species to the Upware group is incontestable, all the Upware 

 species, except Waldheimia Woodwardi, Terebratella Meyeri, and T. capillata, having 

 been found here also. The most noteworthy points of difference are the much greater 

 development of the Terebratalm at Brickhill (T. Keepingii is unknown elsewhere), the 

 presence of Kingena rhomboidea and Terebratulina striata, and the absence of the species 

 aforementioned. It may be observed that these Brickhill species, absent from Upware, 

 are more southern forms, known at Earingdon, or in the Wealden area at Godalming 

 and Ilythe. . . . 



" It is a matter of general experience in working amongst the more prolific families 

 and genera of organic types, that the boundaries of our recognised species are found to be 

 most shadowy and evanescent. In any particular species we have the well-marked 



