576 Corre!<pondeme — A. K. Coon}ava-Swa)ny — Cou-per Reed. 



"Sea mills of Ceplialonia" (Greece). "The mills are driven by 

 a current of sea- water which flows into the land for about fifty 

 yards through an artificial channel, finally disappearing amid clefts 

 and fissures in the limestone rock " (Baedeker). "The boundaries 

 of this influx have never been definitel}'^ determined, but it 

 certainly extends along the coast for nearly half a mile" (loc, cit.). 

 Messrs. Crosby estimate the daily consumption of sea-water at 

 6,000,000 cubic feet. H. E. Strickland has also described these 

 sea-mills (Proc. Geol. Soc, xi, pp. 220, 221). 



A. K. C00MABA.-SWAMT. 



"WOIIPLESDON. 



SALTER'S UNDESCEIBED SPECIES. 



Sir, — In my first paper on some of Salter's Undescribed Species 

 (Geol. Mag., 1900, Dec. IV, Vol. VII, p. 303, PL XII) there 

 is an unaccountable omission, which has only within the last few 

 days been brought to my notice. There is an absence of any 

 reference to the specimen represented in Fig. 7 on the accompanying 

 plate. In what manner the oversight occurred I am unable to 

 discover, as a description was ready for publication with the rest 

 of the paper. The specimen figured, which is referable to the 

 species JSiohe solvensis (Hicks), is of not a little interest, because 

 it is the one mentioned by Salter (Cat. Camb. Sil. Foss. Woodw. 

 Mus., 1873, p. 23, a 469) under the -nauie Asaphiis Menapice. The 

 following description is given by him (loc. cit.) : " Asai^hus Menapits, 

 Hicks (undescribed). A large species with smooth tail-piece." 

 It comes from the Tremadoc rocks of Eamsey Island, and was 

 presented to the Woodwardian Museum by Dr. Hicks. It occurs 

 on the same piece of rock as the type-specimens of Calymene 

 vexata (Salter) (? = Neseuretus reciirvatus, Hicks) and Calymene 

 ultima (Salter) (? = Neseuretus qiiadrntus, Hicks), which I have 

 described and figured in the paper above mentioned. The piece 

 of rock bears Salter's label with these names ; also a later label 

 in Tawney's handwriting, with the inscription " Salter's MSS. names 

 not adopted exactly by Hicks when he described the fossils." This 

 remark is borne out also by the fact that this pygidium of Asaphus 

 MenapicB does not agree with that of Niobe menapiensis (Hicks), 

 as figured and described by Hicks (Q.J.G.S., vol. xxix, 1873, 

 p. 46, pi. iv, figs. 1-9), but with that of Niobe solvensis (Hicks), 

 described and illustrated at the same time. Hicks makes here no 

 mention of the name Asaphiis Menapice, and was apparently ignorant 

 of its retention in the Cambridge Catalogue, which was then on 

 the eve of being published. The specimen of A. Menapice is 

 a slightly distorted internal cast of the pygidium, measuring 26 mm. 

 wide and 16 mm. long, and it agrees in all its visible characters 

 with Hicks' Niobe solvensis. 



In my paper there is also an obvious misprint in the numbering 

 of the figures on the plate (PI. XII). Neseuretus quadratiis is repre- 

 sented by Fig. 6, not by Fig. 5, which represents Neseuretus, sp. 



F. E. CowPEE Reed. 



W00D>A^AKDIAN MuSEUM, CAMBRIDGE. 



