GASTEROPODA. 269 



spire small, prominent ; aperture large, oblong, outer margin 

 irregular. 



Distribution, 12 species. Java, Philippines, Torres Straits, 

 Facific. Under stones at low water. (Cuming.) 



Fossil, M. D'Orbigny refers to tliis genus 18 species, ranging 

 from the L. Silurian to the chalk. North America, Europe. 



Teinotis, H. and A. Adams, 1854. 



Shell depressed, elongated, ear-shaped; spii-e small, and 

 placed posteriorly; hinder part of the foot in the animal 

 stretches far over the shell. 



Distribution, 2 species. East India. 



ScisSTTRELLA, D'Orbigny. 



Etymology, diminutive of scissus, slit. 



Type, S. crispata, PI. X., Fig. 23. 



Synonyms, Anatomus, Montfort ; Woodwardia, Fischer. 



Shell minute, thin, not pearly ; body-whorl large ; spire 

 small ; surface striated ; aperture rounded, with a slit in the 

 margin of the outer lip ; operculate. ITie young have no slit. 



Animal like Margarita ; tentacles long, j)ectinated, with the 

 eyes at their base ; foot with two 

 pointed lappets and two long slender 

 pectinated cirri on each side ; oper- 

 culum ovate, very thin, with an 

 obscure sub-spiral nucleus. 



No part of the animal was external 

 to the shell. The only living example 

 occurred at Hammerfest, in 40 — 80 

 fathoms water; when placed in a 

 glass of sea-water it crawled up the ^ 



side and scraped the glass with its ^'"- "^- Scissureiia. _. 

 tongue. It was pale and translucent when living, but turned 

 inky black after immersion in alcohol. (Barrett, An. Nat. Hist., 

 2nd ser. vol. 17, p. 206.) 



Mr. Jeffreys found S. elegans (D'Orbigny) plentifully alive in 

 sea-weed on the coast of Piedmont. It has a multi-spiral 

 operculum, like Margarita. In this species, as noticed by Mr. 

 G. Sowerby, the slit in the peristome of the young shell is 

 converted into a foramen in the adult, as in the Jurassic 

 Trochotoma. 



Distribution, 5 species. Norway, Britain, Mediterranean. In 



