394 



DR. W. T. CALMAN ON 



composed of a more or less translucent horny material vnTjing 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 horny part is occupied by 

 a calcified plate, rectangular or irregularly rounded in outline, 

 which reaches the distal but not the lateral margins. The distal 

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

 central conical pit. 



Tiie 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, tbe pallets are 

 wholly calcified, with the distal portion slightl}^ yellowish but 

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

 but the most trivial details from European specimens referred 

 to T. navalis. The valves of the shell afford no distinctive 

 characters. 



In the absence of any more satisfactoiy definition of the 

 supposed sp.icies 'T. pedicellata, all our South African specimens 

 may be referred to T. navalis. 



Teredo norvagica Spengler. 



Teredo norvagicus Spengler, Skriv. JSTat. Selsk. Ki^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. Nat. Hist. Economic Series, 

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



Teredo hruguierii 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', Gatlifi[' and Gabriel, Proc. B. Soc. 

 Victoria, xxviii. (n. s.) 1916, p. 118, pi. xiii. figs. 9 tfc 12. 



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

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

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

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

 we have received from Auckland. 



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

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

 by GatlifF and Gabriel. It is true that, in the pai-t of Spengler's 

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

 dealing with Pholas), 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 w^idely known will, no 

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



