72 THE NAUTILUS. 



south. Possibly the prevalence of other forms of life, including 

 enemies of Nudibranchs, in the tropics may have something to do 

 with it, especially since so many tropical Dorids (Chromodoris) show 

 what seem to be warning colors, and are probably inedible. 



The species obtained by the expedition in the southern seas were 

 only five in number, and two of these were not in the Antarctic. 

 Nevertheless all these except one proved new, and two are made the 

 types of new genera. The first of these genera, Notaeolidia, is based 

 on an animal nearly five inches long, obtained at the South Orkneys. 

 This is so distinct that Sir C. Eliot believes it to represent a new 

 family, standing between the Aeolidids proper and the Dendronotines. 

 This would be a family in the sense of Bergh ; a subfamily of Alder 

 and Hancock. The Notaeolidiidre (or NotaeolidinaB) are defined 

 thus to include a single genus and these species: 



" Large animals of Aeolidiform appearance. Oral tentacles large 

 rhinophores perfoliate without sheaths. Foot rounded and grooved 

 in front. Dorsal margin undulated, and bearing one or more rows 

 of close-set cerata. Jaws not denticulate. Radula consisting of a 

 central tooth and four (rarely five) laterals on each side. Central 

 tooth with a strong median cusp and side denticles ; laterals denticu- 

 late on inner side. The liver forms a lobed, flocculent mass within 

 the body cavity, and in the body walls a thick, spongy layer, from 

 which rise the diverticula which enter the cerata. The hermaphro- 

 dite gland lies above the liver." 



The other new genus is Tritoniopsis, based on a species (T. brucci) 

 from Gough Island, 40 20' S. It differs from Tritonia principally 

 in the dentition, the central tooth being narrow and pointed, not 

 broad, and provided with accessory cusps. The outer laterals are 

 much elongated T. D. A. C. 



AN ARRANGEMENT OF THE AMERICAN CYCLOSTOMATID^ WITH 

 A REVISION OF THE NOMENCLATURE. By Win. H. Dall. (Proc. 

 Mai. Soc., London, vi, 208.) A new subgenus (Parachondria) of 

 the genus Chondropoma is proposed, type, C. fascia Wood, Jamaica. 

 Also a new genus Opisthosiphon, type, Chondropoma bahamense 

 Shutt. 



A new Chiton from the New England coast, by Win. H. Dall. 

 (Proc. Biol. Soc., Washington, xviii, 203.) 



This new species, Tonicella blaneyi, was dredged by Mr. Dwight 

 Blaney in 20 fathoms, off Ironbound Island, Frenchman's Bay, 

 Maine. Including the deep-sea species, this makes twelve species 

 of Chitons recorded on and off the New England coast. C. W. J. 



