223 



MOLLUSC A OF THE UNITED STATES EXPLORING 

 EXPEDITION UNDER CAPT. CHARLES WILKES. 



D^= Vol. xii. Mollusca and Shells. 4to. Boston, 1852. 



Arion foliolatus. A. corpore depresso, fulvo, sulcis nigricanti- 

 bus oblique reticulata areolis inclusis foliosis ; clypeo prfelongo, lagvi, 

 fulvo, concentrice fusco-uotato ; apertura communi antemediaufi ; 

 tentaculis parvis, brevibus. Long. 3£ poll. Discovery Harbor, 

 Puget Sound. Dr. Pickering. 



Limax Coi/umbianus. L. corpulentus, corpore elongato, postice 

 carinato, sordide flavo, unicolore vel niaeulis atropurpureis nubecu- 

 lato, tuberculis elongatis longitudinaliter dispositis tessellato ; clypeo 

 lato, antice truncato ; apertura communi postica. Long. 5.5 poll. 

 Nisqually, Mr. Dyes ; Discovery Harbor, Puget Sound, Lieut. Case. 



Generally resembles L. empiricorum. It varies much in color, 

 being sometimes entirely slate-color, and sometimes more or less 

 mottled. 



Limax olivaceus. L. elevatus, retrorsum carinatus, plus minusve 

 acuminatus, ex olivaceo purpurascens ; papillis angustis elongatis ob- 

 liquis reticulatus ; clypeo curto, rotundato, concentrice rugoso ; fora- 

 mine antico ; fronte reticulata ; tentaculis cervicalibus elongatis, 

 attenuatis, nigricantibus. Long. ■§ poll. Paramatta, N. S. Wales. 

 Mr. Couthouy. 



Peculiar on account of its color and its very narrow, delicate, 

 elongated papilla3. It is gradually attenuated both in height and 

 breadth, terminating in a delicate point. 



Limax fuliginosus. L. abbreviatus, corpulentus, acute carina- 

 tus, fubginosus, sulcis remotis obliquis reticulatus, arcobs reticidatis ; 

 clypeo ovali, postice latiori, foramine pulmonali postico ; capite 

 parvo ; tentaculis brevibus, ad apicem ferrugineis. Long. 2.5 poll. 

 Bay of Islands, New Zealand, among turnips. Dr. Pickering. 



Characterized by its sooty color. Dr. P. has no doubt that it is a 

 native species. 



Succinea [Omalonyx] explanata. T. parva, tenuis, scutellse- 

 formis, rotundato-elliptica, pene evoluta, concentrice striata, luteo- 

 cornea: spira marginalis, ferd nulla, omnino aperta; columella 

 arcuata. Long. | : lat. \ poll. Island of Kauai. Couthouy. 



Mr. Couthouy did not notice the animal, but labelled the shell 

 " Testacella." The form of spire does not accord with that genus, 

 but it seems to be an extreme modification of a small group peculiar 

 to the Sandwich Islands. 



Nanina fricata. T. rotata, tenuis, viridi-cornea, superne con- 

 vexiuscula, liris crebris radiantibus interdum furcatis insculpta, in- 



