SIPHONARIA 



Genus SIPHONARIA, Soicerby. 



Testa oviita, nunc elevaio-conica, verticc iiiwinato, i/iiiic de- 

 pressa, radiathn costata re/ liiri/a. ii/ari/ine iloiticii- 

 lata. Impressio muscnianx niitiiv iiilerrupttt, Intci-f 

 caimU phis minus distiiicli: iiiilnilu. 

 Shell ovate, sometimes elevately conical, uncinate at the 

 top, sometimes depressed, radiately ribbed or stri- 

 ated, denticulated at the margin. Muscular impres- 

 sion interrupted in front, more or less distinctly 

 marked, with a canal leading to the side. 

 The attention of Mr. Sowerby was first attracted to 

 this group of Limpets, as distinguished from the ordinary 

 PaMla, by the impressed mark, on one side of the in- 

 terior, of an outlying siphon. The animal was succes- 

 sively anatomized by De BlainvUle and M. Quoy, and a 

 structure corresponding with this mark was found to exist 

 iu the form of a caual, used for the conveyance of water 

 to the branchial cavity, which proved to be situated iu 

 the back of the neck. The first recognized species were 

 described and figured by Mr. Sowerby, in his ' Genera of 

 Shells.' The soft parts were figured by M. Quoy in the 

 ' Voyage de TAstrolabe,' but several of the shells named 

 iu that work as distinct species, and reproduced as such 

 by M. Deshayes in his edition of Lamarck's ' Animau.K 

 sans vertebres,' appear to be varieties of one and the same 

 species in different states. With the aid of a numerous 

 series of specimens of SlpJionaria, collected together by 

 Mr. Cuming, I have been enabled to define many new 

 species, and remove previous errors, the whole forming an 

 exceedingly natural group, all readily distinguished by their 

 variations of form, sculpture, and internal colouring. 



The Siphonar'uB, as will be seen on reference to the 

 habitats, are widely distributed in both hemispheres. 



Species 1. (Fig. u, h, ^lus. Cuming.) 

 SiPHON.\RiA DiEJiENENSis. Sipli. testd ovatd, convexd, 

 vertice aeiito, radiaiim costatd, cosiis numerosis, rudi- 

 iiis, irregulai-'ibus ; costis aliidis, intent itik versus mar- 

 yinem cinefeo-nifesceiifibus, niuri/ini' iiitiis conspici'i 

 castmieo albogue lineolato. 

 The Van Diemen's Land Siphonaria. Shell ovate, 

 convex, sharp at the top, radiately ribbed, ribs nume- 

 rous, rude, irregular ; ribs white, interstices ash-red 

 towards the margin, margin conspicuously lincated 

 withiu with chestnut and white. 



Quoy and Gaimakd, Voy. de 1' Astrolabe, vol. ii. p. 337- 



pi. 25. f. 1-13. 

 IM. Van Diemen's Land. 



Au acutely convex species, irregularly closely ribbed, 

 with the interstices excavately grooved, and further dis- 

 tinguished by the inner margin being conspicuously tes- 

 sellated. 



Species 2. (Fig. ff, /a Mus. Cuming.) 

 Siphonaria scabra. Sijili. testd ortjicidari, subdepresse 

 convexd, i-ertiec obtuse acumiuatd, radiatim costatd, 

 costis rudibus, scabris ; costis sordide albidis, inter- 

 stitiis puipurco-fuscescentibus, intus purpureo-lineatd. 

 The rough Siphonaria. Shell orbicular, rather de- 

 pressly convex, obtusely pointed at the top, radiately 

 ribbed, ribs rude and scabrous ; ribs dirty-white, in- 

 terstices purple-brown, interior purple-liiieated. 

 Jlab. Port Jackson, Australia. 



Of a more orbicular form than the preceding species, 

 with the ribs more rough and irregular, and, the shell 

 being of thinner substance, the purple linear painting is 

 seen running up further in the interior. 



Species 3. (Fig. <i, b. Mus. Cuming.) 



Siphonaria gigas. Siph. testa elevato-cuiicexd, radia- 

 tim fortiter costatis, cosiis rude aiigulatis, aciitis, in- 

 terstitiis striatis ; fused, versus marginem nigricanle 

 tinctd. 



The giant Siphonaria. Shell elevately convex, radi- 

 ately strongly ribbed, ribs rudely angled, sharp, in- 

 terstices striated; brown, stained with black towards 

 the margin. 



Sowerby, Tankerville Catalogue, App., p. vii. n. SOS. 



Hab. Galapagos Islands and Panama. 



This fine species is well distinguished by its strong, 



rude, angularly raised ribs, radiating from the top like 



buttresses. 



Species 4. (Fig. a, b, Mus. Cuming.) 

 Siphonaria denticulata. Siph. testd ovatd. erassii, 



