416 



MOLLUSKS OF THE GALAPAGOS STEARNS. 



IV. SUCCINEA, Driipiiriiaud. 

 34. Succinea (Tapada) Bettii Smith. 

 ITAinTAT. — ('liatluim Island (E. A. Sinitli, /. c). 

 35. Succinea (Tapada^ Wolfi Ktib. 



IlAiHTAT. — Cliatliain Island (Wolf). 



In llic woodcil rc^ioii, !I00 to 2, ()(>(> I'oet al)<)vc the sea, abundant in 

 moss and anioni;' rocks; also \;\y. jtr()(h(ct((j a more elonjiated, slenderer 

 form than the tyi)ieal ITo///, represented by a single individual; sta- 

 tion same as type Ibrm, 



V. HELICINA Lamarck. 

 36. Heliciiia Wolfi Kril.. (PI. ii, Vig. V.i.) 



Habitat. — Chatham Island (Wolf). Station same as the above Suc- 

 cincas, !)(K) to 2,000 feet altitude, aniong the mosses and rocks. This 

 form was previously described by Dall, and was named by him iiesiot- 

 /m, see ]Iclu-ina{I<h'S(() ncaioticd in "The Nautilus" for January, 1802. 



Of Reibisch's biralidKS (No. 0) and his (No. 10) voinstus, the number 

 of e\aini)les that he had is not stated. If one may judge of these by 

 the following, it may be assumed that the number was quite inadequate. 



Of j>a^//r/»,s' (No. 13) four, only o?ie of which was j?er/i'C<; cincreuH (No. 

 14), two in i)oor coinlition; rcnfronx.s (No. l(i), three exam])les, one im- 

 l)erfect; aeutits (No. 18), f/ro mature o^c adolescent example; niidi(s(No. 

 21), tico examples Meatliered; Woljl (No. 24), three specimens, two 

 grown, one immature; SiinroOii (No. 25), three individuals which may 

 not be fully grown; one of these is deformed. 



The extreme variation of these Galapagos bulinu)ids is so great that 

 it may ultimately be foniul that what are now regarded as tliree spe- 

 cies, J>((rici)ni, ru(/i/'eriis and Nri(Jpiiir((ti(s, plus callosities and color, are 

 varieties of one. To these should be added Reibisch's H^o//i, which 

 probably belongs to />(<r/r////, th(^ third tooth on the outer lip which 

 constitutes the dilference, is of insigniticaiit value. 



DK. JONES'S CHATHAM ISLAND, GALAl^AlJOS SHELLS.^ 



1. Mytilusi'unoilbniiisKct'vo 



tanus Lam. 



2. Tellina (Ca]>sa) oxcavata Shy. 



3. jMactra vdatalMiil. 



4. Bullapuiutnlala A. Ad. 



5. Conns lucidus Mawo. 



6. Conns nnx IhixL 



7. Oliva ]H>ruviana Lam. 

 S. Fnstis l)n]u"titli()naivsii Kit-n. 

 9. rnri)nra nielo Dnilos. 



10. Purpura patula Liiino. 



* List of shells foUectetl ou the wost roast of South America, principally between 

 latitudca 7- 30' south and S I!)' north, I'roc. U. S. Nat. ifTis.. A'ol. xiv, pp. .307-335. 

 1891. 



