Prof. Rupert Jones — Tertiary Entomostraca. 157 



No. 41. This has been found living in tlie North-British seas by- 

 Mr. Brady, op. cit. p. 428. 



No. 42. This species is noted above, p. 74, No. 1. There are 

 sevei'al forms of this kind, besides tlie two varieties, insignis and 

 glabra, from the London Clay (Monograph, p. 46) ; such as C. 

 punctatella, Bornemann, Zeitsch. vii. (1855), p. 360, pi. 21, fig. 2, 

 and C. incrassata, Bosq., Ent. Tert , p. 44, pi. 8, fig. 11. 



No. 45. This is a doubtful species. It may be the young of the 

 next. 



No. 46. This curious sj)ecies, or one extremely like it, has turned 

 up in specimens given to me by the late Dr. Mantell, as coming 

 from the Oxford Clay of Wiltshire, and also in the Oxford Clay of 

 Skye, collected by Messrs. Geikie and Young, and there associated 

 with Estlieria. Its generic characters are doubtful. If its fresh- 

 water habitat in the Hempstead series be a criterion, it points to 

 more freshwater or estuarine conditions in the Oxfordian series than 

 are usually thought of. 



No. 47. This has been found recent in the Atlantic at many places 

 by Mr. Brady (op. cit. p. 435), and proves to be a Loxoconcha, Sars. 



No. 48. This may be a Cy there ; it is not a true CytTierideis. 



No. 49. This is a living Atlantic species, and Mr. Brady (op. cit. 

 p. 432) refers it to Ilyohates, Sars. 



No. 50. According to Mr. Brady, Miiller's C. flavida, differs 

 materially from this kind of form. Nor will the Crag species suit 

 with Ci/therideis suhidata, Brady, which is represented [op. cit. p. 

 454, pi. 35, fig. 43-46) as the species termed C. flavida by Dr. 

 Baird. I therefore propose a new name ( C. hotellina) for the Crag 

 species, referring it to Cythere. The references to Eecent and Upper 

 Eocene specimens, at p. 50 of the Monograph, will not hold good. 



No. 51. The genus is not well substantiated. 



No. 52. Mr. Brady has suggested that we have not the real B. 

 suhdeltoidea in the forms figured in the Monograph ; and it is quite 

 possible that he is right. The Crag form, pi. 4, figs. 2 and 3, is very 

 much like his B.fusca (Trans. Zool. Soc. 1866, p. 364, pi. 57, fig. 

 9), from Australia ; and the specimens from the London Clay, pi. 6, 

 figs. 1 and 2, are like his B. formosa (Ann. Nat. Hist. ser. 4, vol. ii., 

 p. 221, pi. 14, figs. 5-7) from Tenedos ; but still more closely 

 correspond with suhtrigona, Bornemann (Zeitsch. Geol. Ges. vol vii., 

 p. 357, pi. 20, fig. 4), from the Oligocene Septarium-clay of 

 Hermsdorf. 



No. 54. Described as Gytlierella compressa and varieties. These may 

 either belong to that species, or be separate species, namely C. 

 fahacea, BeyricMi (Ess.), and intermedia of Bornemann. Figs. 21 

 and 23 fairly correspond with his figure of C. fahacea; fig. 18 is 

 decidedly G. Beyricliii (Ess. sp.) ; and fig. 19 has a strong resemblance 

 to his C. intermedia, and Brady's C. Scotica (op. cit. p. 473, pi. 34, 

 figs. 18-21) is very near it. The Cytherellce require synoptical 

 revision and perfect figuring of all their varieties. The species 

 seem to have considerable variations. 



No. 56. Fig. 12 may be separated as var. rectipunctata. 



