26 Mr. Sylvanus Hanley on the 



which I cannot distinguish. The more prominent features 

 seem the peculiar thinness of the valves, whose swollen 

 triangular area is so large as to occupy one half the entire 

 length (hence the fang seems peculiarly short). 



During the last twenty years four principal monographic 

 lists of the Teredines have been published by Jeffreys, Fischer, 

 Tryon, and Sowerby. The last, the only one which has been 

 illustrated, and consequently the only one which will enable 

 the mass of collectors to determine their specimens, is by 

 Sowerby in his hurried conclusion of Reeve's ' Conchologia 

 Iconica.' Unfortunately he has neglected the many new 

 species {subericola, excavata, hipartita, spatha*, fusticidus) 

 described by Mr. Jeffreys in the ' Annals and Magazine of 

 Natural History ' for 1860 ; these, although elaborately de- 

 scribed, are unknown to me (for want of ligures or, perliaps, 

 of examples) , as well as to most conchologists ; hence illus- 

 trations of them would have been generally acceptable. 



As my long study of this genus and the possession of a 

 remarkably fine collection of Teredines have enabled me to 

 correct certain errors in the ' Iconica,' and to suggest addi- 

 tional statements, I venture to critically annotate many of the 

 species indicated. In order to obtain absolute certainty as to 

 what the draftsman actually intended, I have carefully looked 

 for the examples declared to have been drawn from specimens 

 in the British Museum, where, although aided by the Curator, 

 I have often failed to discover them. 



The sequence here followed is that adopted in the text 

 which accompanies the four and only plates. 



T. navalis. — The reference to Sellius, who expressly men- 

 tions that he uses the term " Teredo marina " t generically, 

 should be pi. ii. figs. 2, 3, 6 ; to Spengler, Skriv. Nat. Selskab. 

 vol. ii. pt; 1, p. 103, pi. ii. fig. C. 



T. norvagica. — The reference to Spengler's monograph 

 should be pi. ii. figs. 4, 5, 6 ; to T. nigra^ Blainville, Diction. 

 Sc. Nat. vol. Hi. p. 267, as in ' Quarterly Review,' pi. i. 

 fig. 20, a, h. T. navium of Sellius had better have been 

 omitted, for although that author classed all the ship-worms 

 known to him as Teredomarina (a compound generic name), 

 he has copied (?) a bud-shaped pallet, which he regarded as 



* Pallets in British Museum, teste Jeffreys. 



t Teredo means a borer ; the adjective marina is used to distinguish tiie 

 salt-water worm from Teredo vestiuni, the larva of the clothes moth. 

 Hence it is logically absurd to claim precedence for it. 



