MOLLUSC A. 63 



anfraetibus quinque, ultimo rotundato-inflato, apertura lunato-rotundata, peristomate intus incrassato, in 

 inargine columellari calloso. 



Hab. Airiea. 10 iJ^^c^u &xJ^J^, - <^AX-#-C<^£^ <-rfhj ..'V^A 

 A white globose shell, with simple lip banded and minutely sprinkled with black. 



21. Heltx conoidalis. PL XVI. Kg. 11. H. testa orbiculato-conoidea, subobtecte perforata, 

 superne elevata, basi convexa, radiatim striata, pallide rufescente, anfraetibus quinque, superne marginatis, 

 reticulato-striatis aut corrugatis, mfo-violescentibus, ultimo fascia angusta castanea circumdato, peristo- 

 mate simplici, vix incrassato. 



Hab. Island of Mindoro, Philippines. 



Distinguished chiefly in form by its concave base and conoid manner of convolution above. 



NUCLEOBRANCHIATA. 



53. CARINARIA, Lamarclc. 



1. Carinaria Atlantica. PI. XIII. Pig. 12. Body elongated, subcylindrical, smooth ; head tumid, 

 rather elevated in front; eyes behind the tentacles on the upper part of the head; tentacles small, 

 aciculate ; proboscis rather large, furnished at the extremity with curved hooks ; fin sharply triangular, 

 sucker linear. Shell small, compressed, with the keel broad and prominent. 



t 



Hab. Xorth Atlantic Ocean. 



Numbers of this species were taken at twilight in the trawl, swimming in company 

 with Firol<s. They were observed to progress with their body straightened, darting through 

 the water with great rapidity. 



PLEUROBRANCHIATA. 

 54. APLYSIA, Limusus. 



1. Aplysia loeolata. PI. XVII. Pig. 1. Aplys. dorso convexo, postice acuminato, pallide viridi, 

 lineis nigricantibus anastomoticis oculisque compluribus ornato, oculis pupillo nigro, iride vivide violacea. 



Hab. Mauritius. 



This elegant species is remarkable for the acuminated form of its caudal extremity, and 

 for the slenderness of the posterior tentacles. 



2. Aplysia fimbeiata. PL XVII. Pig. 2. Aplys. tentaculis anterioribus fimbria lata margine 

 sinuata ab exteriore tentaculi parte ad capitis latus pertinet, tentaculis posterioribus ad apicem inclinatis 

 et in margine acnto inclinato alte incisis, obscure subviridi, ocellis permultis pupillo minuto albo, iride 

 fusca, lineis nigris anastomoticis ornata, punctis minutis opacis albis picta. 



Hab. Ty-pin-san, Meiacoshima Islands. 



Inner surface of foot, when seen expanded, marbled with black and white. 



