482 Dr. F. A. Bather — Tube-building Fossil Anne/ides. 



appears to represent a tube composed of the small ossicles of starfish 

 and brittle-stars. Other specimens, recently detected by Dr. Marie C. 

 Stopes in the course of her work on the Catalogue of Cretaceous plants 

 in the British Museum, have a very distinct tube composed of leaflets 

 and fragments of bark of some coniferous tree or trees, either pine or 

 fir. Finally, there are specimens which, in the words of Davies, 

 " admirably show by impression the membranous or horny structure 

 of the tube," yet "bear no indication of the attachment of any foreign 

 substance "." 



Before entering on any speculation as to the specific distinctness or 

 identity of these various forms, it may be well to set forth such 

 definite facts and natural conclusions as are not already contained in 

 the valuable paper by Davies. The tubes of different composition 

 will be dealt with in order. 



Tubes of Fish-debius. 

 ' Terebella' lewesiensis (sensu stricto). 



Diagnosis. — Tube of fish-debris, with diameter from 1 to 3 cm., and 

 with a possible length of 34 cm. or moz'e. 



Horizon. — Cenomanian to Senonian. 



Locality. — South-East England generally, so far as recorded. 



Ledoholotype. — B.M. 4152, ex Coll. Gr. A. Mantell. 



This appears from the British Museum specimens to be common in 

 the Cenomanian zone of Holaster subglobostis, and the nature of their 

 matrix suggests that Mantell's figured specimens probably came from 

 this zone. He gives as localities " Upper and Lower Chalk, near 

 Lewes and Brighton" (Foss. S. Doivns, p. 233). The matrix of the 

 figured specimens suggests Lewes rather than Brighton. Since 

 Mantell says (loc. cit.) that his " Tab. xl, fig. 2, represents the usual 

 appearance of these fossils", I fix on the original of that figure 

 (B.M. 4152) as lectoholotype. Mantell says that specimens "occur 

 abundantly in the Upper chalk, and occasionally in the siliceous 

 nodules". All these may have been formed by the same species ; one 

 cannot distinguish them. 



In addition to a number of specimens labelled "Kent" or "Sussex", 

 or merely " S.E. England", there are in the British Museum repre- 

 sentatives of this typical form from the following more precise 

 localities : — 



Folkestone. Chalk Marl, Cenomanian. [58255.] 



Hamsey, Sussex. "Grey Chalk Marl," Cenomanian. [4154.] 



Cowslip Pit, near Guildford. Cenomanian. [A 1571/2/3.] 



Burwell, Cambridgeshire. Greyish "Lower Chalk ", Cenomanian. [58256.] 



Aylesford, Kent. Cenomanian (?). [23158.] 



Near Lewes. " Lower Chalk," Cenomanian. [4124, 4148, 4151, 4152, 



25942 (?).] 

 Near Lewes. " Upper Chalk." [4122, 4156, 58259, A 73.] 

 Davis' Shalford Pit, near Guildford. Upper Chalk, Senonian. [A 1627- 



A1634.] 

 St. Giles' Gates, near Guildford. " Upper Chalk." [58258.] 

 Chatham. " Upper Chalk." [A 1636.] 



It will "be noted that the Turonian is, so far as our definite 

 information goes, unrepresented in this list. In March, 1880, 



