Mr. A. Adams on two new species of Hetei-opoduus Mollusca. 461 



Clivina, Lat. 

 1. C. (jrandis, Dej. ii. 478. 



Nigra ; thorace quadrato ; elytris elongatis, parallelis, punctato- 

 striatis, punctis quatuor impressis, margine tenui, macula 

 postica, antennis pedibusque rufis. 



Long. 5^ lin., lat. If lin. 



[To be continued.] 



XXXV. — Descriptions of two new species of Heteropodous 

 Mollusca. By Arthur Adams, Surgeon R.N. 



To the Editors of the Annals and Magazine of Natural History. 

 Gentlemen, South Atlantic, oflF Cape Frio. 



Since writing my last note on the Equator, two species of 

 Sinusigera of D'Orbigny, or Cheletropis of Forbes, have occurred 

 to us among the contents of the towing-net, and both different 

 from S. Huxleyi, Forbes. One is of a dark reddish-brown 

 colour, with an elevated spire, and keeled on the last whorl ; the 

 other is of a delicate pink or flesh-colour, and is much more 

 globose ; both species are finely reticulated. The dark species 

 I presume to be that originally described by D'Orbigny, ,S^. can- 

 cellata ; the other species I have dedicated to that eminent na- 

 turalist and accurate observer. The animal, so well figured and 

 described by Mr. Macdonald of the " Herald,^' is by no means 

 shy, and appears to employ the cephalic arms for reptation, 

 crawhng head downwards somewhat in the manner of an Octo- 

 pus ; they also answer the purpose of tentacular arms for the 

 capture and retention of the minute crustaceans on which they 

 prey. The genus Sinusigera belongs to the family Macgilli- 

 vrayidce, established by my brother and myself in our ' Genera 

 of Mollusca,' which appears, however, to differ sufficiently from 

 the other Heteropods to stand by itself as an independent sub- 

 order, which might be called Brachiucephala. The new species 

 may be thus characterized : — 



Sinusigera D'Orbigmji, A. Adams. 



S. testa turbinata, subglobosa ; spira obtusa, carneola, vertice luteola, 

 pulcherrime reticulata ; anfractu ultimo ventricoso, ecariuato. 

 Apertura semiovali ; labro margine vix incrassato, lobis duobus 

 instructo, lobo antico simplici et obtusim acuminate, postico cana- 

 liculate et ad apicem truncate. 



Hab. in Oceano x\tlantico Australi. 



Shell turbinate, subglobose, with an obtuse spire, flesh-co- 



