TERRESTRIAL MOLLUSOA INHABITING SOCIETY ISLANDS. 
29 
^Ir. Pease’s Pitliys Atiensis, which I add to the synonymy, is thus described : — 
“ T. orbicularis, tenniscula, late umbilicata, confertim costulata, havido et rufb 
tessellato-strigata ; spira vix elevata, apice obtuso ; anfr. 5, convex!, nltimns ad peri- 
pheriam rotundatus ; sutiira bene impressa ; apertura obliqua, subcircularis, lamellis 
carens ; perist. simplex, rectum. Diam. 3, alt. If mUl.” (Pease). 
The Plarvey Island shells, which attain a larger size than those found elsewhere, 
differ none in shape and sculpture, and the coloration is the same as Society Island 
specimens. The umbilicus varies from one-fourth to one-third the greater diameter 
of the shell. 
I also add to the synonymy Mousson’s Patula vicaria, described as follows : — 
“ T. pai'vula, aperte umbilicata, orbiculato-depressa, regulariter et tenuiter costulato- 
striata, striis squamulosis, faciis pallide corneis et fnseis radiatim picta. Spira planiuscula, 
subarcte spirata ; suninio minuto, Isevigato, obtuso ; sutura perimpressa. Anfr. 4^, 
lente accrescentes, convex! ; ultimus lente descendens, supra paulo ttimidulus, deinde 
regidariter rotundatus. Apertura subverticalis (15° cum axi), cxacte lunato- 
semicircularis, plicis destituta. Perist. rectum, acutum ; marginibus convergentibus ; 
dcxtro et basali antrorsum leniter biarcuatis, columellari non reflexo, nec. protnicto. 
Umbilicus f diametri sequans. Alt. 1-5, diam. 3 mill. Hat. anfr. 7:2. Rat. apert. 
1 : 1” (Mousson). 
With the exception of being a trifle smaller, is not dissimilar in any respect Irom 
the Harvey Island shells. 
The above author has described a variety of modiceUa from the Kcrmandec or 
Sunday Island, as follows : — 
“Anfractibus magis rotundatis, costulis, sed tenuibus; albescens, maculiset flamimdis 
rufis transverse picta; diam. 3, alt. 1-2 mill.” (Mousson). 
P. CONSIMILIS, Pease. Plate II, figs. 12, 12 a, 12 b. 
Helix consimilis, Pease, Amer. Jour. Conch., 1861, p. 227. Pfeiffer, Mon. Hcl., vii, p. 262. 
Helix radiella, Carpenter (not of Pfeiffer), Proc. Zool. Soc., 1864, p. 675. 
Pitys consimilis, Pease, Proc. Zool. Soc., 1871, p. 474. 
Patula societatus, “ Mousson,” Schmeltz, Cat. Mus. Godeff., iv, p. 73. P.aetel, Cat. Conch., 
p. 95. Pfeiffer, Mon. Hel., vii, p. 482. 
Patula consimilis, Schmeltz, Cat. Mus. Godeff., v, p. 207. 
Common and diffused throughout all the larger valleys of Haiatca, wlicre it is 
peculiar. Mr. Pease’s habitat, “ Tahiti,” is wrong. I collected all his type examples 
at the former island. 
The spu'e is convex, the first and second whorls planulate and the suture cliannclcd. 
The whorls are narrow, slowly and regularly increasing, turgid next to tlie suture and 
the rib-like strim are very thin and closely set. The aperture is nearly vertical and 
the parietal region with one or two larainte. 
5 JOCK. A. N. s. PHILA., VOL. IX. 
