﻿T !•: II K D 0. 



Tunius TEREDO. L/mi«v(.s-. 



Molliiscum vermlfuriiie, pe)j'(ir(a>g, lidiam (eslaceam 



plerumque fonnans, siphonihris stijlorum cnrneci- 



rum vel palmularum testacear-mn pari mnnifiim. 



Testa globosa, cequivalvis, aniice angidurlffr, 



postice arcuatim liians ; cardine calloso, ntrdijiic- 



valvd processu isnbumhonali muni'td. Tuba ad 



terminum siphonaJrm lantinis sepfijormlbtts j're- 



quenter dlvisd. 



Mollusc worm-sliaped, perforating, generally forin- 



Lng a shelly tube ; siphons provided with a pair 



of horny stylets or shelly pallets. Tube divided 



at the siphonal end by septiform lamina;. Shell 



globose, equivalve, gaping anguliirly in front 



and in a curve behind ; hinge callous, provided 



with a subnnibonal process in each valve. 



The habits of the Teredos arc only too well known 



wherever they are found. The mischief they do in 



boring ship's timbers, and destroying breakwaters 



and piles, causes thera to be reckoned among the 



enemies of industrial mankind. They generally bore 



in the direction of the grain of the wood, sometimes 



a little crookedly, but seldom intruding into each 



other's bores. The shelly tube forms the lining to 



the hole, and the valves are enclosed at the wider 



extremity. The pallets or st3'les are attached near 



the ends of tlie siphons, and seem to be nsed for the 



purpose of compressing and relaxing them, so as to 



assist the circulation of the water through the 



lengthened tubes. The pallets in some species 



are shelly and spade-shape ; in others horny and 



styliform. These divisions are separated genericallj- 



by some authors as Teredo and Xtloi'h.\ga. 



The siiir Teredo. Shell oblique, ratlii^r solid, mh- 

 terior areas very finely striated; niidillt' snlnis 

 ridged, posterior area smooth, auricle Inr^'c 

 round; tube rather thin, not chambereil ; [)aliris 

 shelly, oblong, end arched, stem short. 



TjIN'n.hus. Systema Natura;. 



Tn-cdo warhias. Sellius. 



T.n'dofafah'.^. guatrefages ? 



Ilab. firlti.sh coasts. Piles of YarnuiTitli Pier. Kiuns- 

 gate. 



species "2. (Fig. 2, a, b, <: ; for tube, see Fig. 1, .-, il, 

 ilus. Brit.) 



Teredo NoRVf;Gic.\. Ter. fi'nld aUiiKmld, .«)/;./,(', 



raid!- arcuntd : s„l,-o ,„ni;a„; pm/iuido : aiim-idd 



a,„i„.-:ld, ^rnnrnlinuld : palnndis tr.<l., ,;■;., ..hbnnii--'. 



tn-nlnin roiicr,:,, Inlrrib,,, d.rlu-dn,^, ^lipllld 



\ brrriii.-Ti,!,; ; laid mbu.s/d. rn„ra,„<'i-afd. 



I TiiK Nokwegian Tekbdo. Shell rather hiL:li. sulid, 

 much arched ; medial groove deep ; aurirlf 

 I narrow, half-round ; pallets shelly, ol)lo.ig, « i.h 



convex end, sloped sides, and rather short stem ; 

 tube robust, chambered. 

 Si'E.viii.EK. Forbes and Hanley, B. Mol. p. OG. 

 j Ti-rcdo iiiijm. Blainville. 

 Trrvdo linujidn-i Delle Chiaje. 

 Trredofatalis id T. Ihsliaii. Quatrefages. 

 Teredo naviiint. Sellius. 

 Hah. British and Northern coasts. 



The breadth of the valves, as compared with the 

 height, is less in this species than in the preceding, 

 aiul the posterior auricle is much narrower. 



Species 1. (Fig. a, b, only Mns. Brit.) 



Teredo navalis. Ter. tesfd obUqud, solidiuscidd ; areia 

 a7)ficis fenuisf^iine sfriatis ; sulco •inndiajw l/'rafo, 

 iin:d posticd laivigatd, auricidd niagnd, rafiiiidd ; 

 tuba temduscnJd, minime cameratd ; pal inn! is 

 iesfaceiSfOblonqis, ierminn concavo.arcuafo ; silpnld 

 brri,;. 



Species 3. (Fig. a, h, Mus. Brit.) 

 Teredo BIFENXATA. Trr. fcsfd altd, teimilrr xti-iaid, 

 uniboinhus callosiii ; anrindd pnslird rjnuilii. .nl 

 jundiiram angustatd, rir<ii^ ninrijiiiri,! hitiraln, 

 expansd, paidb supra uiiibuiinii rlrr^l,! ; sti/li.-- 

 corneis, inmqiudibus, articidatin ; uiw brci-i, stiptdd 

 elongaid, altera eloiigafo, sfipuhi brevihsculd. 

 The niPENN'ATE Teredo. Shell high, finely striated, 

 umboes callous ; posterior auricle raised, narrow 



