394 DR. W. T. CALMAN ON 



composed of a, more or less tiuiisluceiit homy material varying in 

 ■colour from yellowish to dark brown, within which the distal end 

 of the calcified part is seen to project as a rounded cone. On the 

 outer surface, the central area of this lidrny part is occupied by 

 a calcified plate, rectangular or irregularl}^ rounded in outline, 

 which reaches the distal but not tlie lateral margins. Tlie distal 

 end of the pallet is concave or notched, with a more or less deep 

 central conical pit. 



The structure described above is most easily seen in the 

 smaller specimens from South Africa, measuring about 40 mm. 

 in length of body and having the pallets about 5 mm. long. The 

 Alderney specimens are a good deal smaller. In some South 

 African specimens of about the same size, however, the distal 

 calcified plate cannot be seen, and in some larger specimens the 

 basal calcification, instead of penetrating into the interior of the 

 horny part, extends up along its lateral margins. In the largest 

 specimen of all, in which the body is a foot long, the pallets are 

 wholly calcified, with the distal portion slightly yellowish but 

 not horny. This large specimen does not appear to difter in any 

 but the most ti'ivial details from European specimens referred 

 to T. navcdis. The valves of the sliell afford no distinctive 

 charactex'S. 



In the absence of any more satisfactory definition of the 

 supposed spijcies T. peclicellata, all our South African specimens 

 may be referred to 2\ navcdis. 



Teredo norvagica Spengler. 



Teredo norvagicus Spengler, Skriv. Nat. Selsk. Ivi^benhavn, ii. 

 H. 1, 1792, p. 102, pi. ii. tigs. 4-6, B; Forbes and Hanley, Hist. 

 Brit. Moll. i. 1848, p 66, pi. i. figs. 1-5; (norvegica) Caiman, 

 Marine Bor'ng Animals, Brit. Mus. ISTat. Hist. Economic Series, 

 No. 10, 1919, p. 9, fig. 2, p. 15, fig. 5. 



Teredo bruguierii Delle Chiaje, Memorie &c. iv. 1829 (1830), 

 p. 32, pi. 54. figs. 6. 12, 13 ; Suter, Manual N. Z. Moll. 1913, 

 p. 1019, pi. Iv. figs. 1 a~d\ Gatlitf and Gabriel, Proc. R. Soc. 

 Tictoria, xxviii. (n. s.) 1916, p. 1 18, pi. xiii. figs. 9 & 12. 



Remarks. — Suter recorded this species from Auckland, Avhere, 

 liowever, he considered that it was in process of being displaced 

 by Xylotrya saidii (i. e. X. australis). It is therefore of interest 

 to note that the latter species alone occurs in the collection which 

 we have received fi^om Auckland. 



Suter has adopted Delle Chiaje's name for tliis species on the 

 ground tliat Spengler's was " not binomial,"' and he is followed 

 by Gatliff and Gabriel. It is true that, in the part of Spengler's 

 memoir which deals with the genus Teredo (but not in that 

 dealing with Fholas), the specific name is followed by a comma, 

 not by a full stop. Those who consider this an adequate reason 

 for displacing a name long in use and widely known will, no 

 doubt, continue to refer to this species as T. bruguierii. 



